CN107561330B - 20-level indicating circuit of multiple input sources - Google Patents
20-level indicating circuit of multiple input sources Download PDFInfo
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Abstract
The invention discloses a 20-level indicating circuit of a multi-input source, which comprises a level signal generating circuit, a 10-level 0-2.5V level indicating circuit and a 10-level 2.5V-3.5V level indicating circuit, wherein two linear point/columnar 10-level LED display drivers LM3914 are used for cascading to form the 20-level indicating circuit; the three signal generating circuits of the touch delay switch circuit, the manual voltage regulating circuit and the self-oscillation circuit are adopted as level input sources of the level indicating circuit, the level change in the circuit operation is visually presented by the subsequent level indicating circuit, the level of the input signals can be visually reflected by the level of the LED column or the level of the two points of the LED, namely, the visual display circuit can also carry out measurement, comparison and analysis on the three signal generating circuits in the working process, the circuit selection application is effectively carried out, and the circuit is small in size and stable in operation; the short-circuit cap is arranged, so that the current in the circuit can be conveniently detected.
Description
Technical field:
the invention belongs to the technical field of level indicating circuits, and particularly relates to a 20-level indicating circuit with multiple input sources.
The background technology is as follows:
the level indicating circuit is characterized in that the level indicating circuit is used for indicating the level in a visual bright spot or high-low mode, one of the existing level indicating circuits is mainly built by discrete components and mainly applied to diodes and triodes, as shown in figure 1, when Ui is more than 0.6V and 0.7V, VT1 is changed from cut-off to on, an LED1 is lighted, and after Ui is increased by about 0.7V, one subsequent LED is lighted, so that signals are visually displayed, the circuit is large in size, and the technology is basic; in another type, as shown in fig. 2, a level indicating circuit built by an application specific integrated circuit chip is a 4-level indicating circuit built by an integrated chip D1405, and the level indicating driving integrated circuit D1405 uses 5 bar-shaped light emitting diodes to represent the input signal level, and a constant current follower capable of directly driving the LEDs is arranged in the level indicating circuit, so that the current flowing through the light emitting diodes does not change when the power supply voltage is changed. The circuit has wide working power supply voltage range and can work normally within 4.4-12V. An internal DC amplifier. Open loop gain >30DB. The amplifier has very high input impedance, but its input source is single, can not carry on the comparative analysis, can not choose the suitable circuit according to the need.
The invention comprises the following steps:
therefore, the invention aims to solve the technical problems that the level indicating circuit in the prior art is large in size, single in input source, incapable of performing comparison analysis and incapable of selecting a proper circuit according to the requirement, so that a 20-level indicating circuit with multiple input sources is provided.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a20-level indicating circuit of a multi-input source comprises a level signal generating circuit, a 10-level 0-2.5V level indicating circuit and a 10-level 2.5V-3.5V level indicating circuit.
The level signal generating circuit is a touch delay switch circuit or a manual voltage regulating circuit or a self-oscillation circuit.
The 10-level 0-2.5V level indicating circuit comprises a first driving chip U1, a first row of LED U3, a ninth short-circuit cap J9, a first resistor R1, a second resistor R2, a fourth resistor R4, a fifth resistor R5 and a seventh short-circuit cap J7, wherein the 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin and 10 pin of the first driving chip U1 are sequentially connected with the 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin and 20 pin of the first row of LED U3 respectively, the 1 pin-10 pin of the first row of LED U3 is connected with the positive electrode of a direct-current voltage source U5, the second end of the second resistor R2 is connected with the 11 pin of the first driving chip U1, the 1 pin of the ninth short-circuit cap J9 is connected with the 11 pin of the first row of LED U3, the ninth short-circuit cap J9 is connected with the first row of LED U1, the 6 pin of the first driving chip U1 is connected with the first end of a fourth resistor R4, the first end of a fifth resistor R5 is connected with the first end of the fourth resistor R4, the second end of the fifth resistor R5 is grounded, the 6 pin of the first driving chip U1 is divided by the fourth resistor R4 and the fifth resistor R5 to obtain 2.5V voltage, the 4 pin and the 8 pin of the first driving chip U1 are respectively grounded, the 2 pin of the first driving chip U1 is grounded, the 3 pin of the first driving chip U1 is connected with the positive electrode of a direct current voltage source U5, the 7 pin of the first driving chip U1 is connected with the 1 pin of a seventh short-circuit cap J7 after being connected with the first resistor R1 in series, the 2 pin of the seventh short-circuit cap J7 is grounded, the 5 pin of the first driving chip U1 is connected with the 1 pin of the fourth short-circuit cap J4, the 2 pin of the fourth short-circuit cap J4 is connected with the third voltage Vo3 in a manual voltage regulating circuit, the 2 feet of the first short circuit cap J1 are connected with the 5 feet of the first driving chip U1, the 1 feet of the first short circuit cap J1 are connected with the first voltage Vo1 of the touch delay switch circuit, the 3 feet of the first short circuit cap J1 are connected with the second voltage Vo2 of the self-oscillation circuit, and the 9 feet of the first driving chip U1 are connected with the 6 feet of the double-pole double-throw switch SW 1.
The 10-level 2.5V-3.5V level indicating circuit comprises a second driving chip U2, a second row of LEDU4, a tenth short-circuit cap J10, a third resistor R3, a sixteenth resistor R16, a seventeenth resistor R17 and an eighth short-circuit cap J8, wherein the 1 foot, the 18 foot, the 17 foot, the 16 foot, the 15 foot, the 14 foot, the 13 foot, the 12 foot, the 11 foot and the 10 foot of the second row of LEDU4 are respectively connected with the 11 foot, the 12 foot, the 13 foot, the 14 foot, the 15 foot, the 16 foot, the 17 foot, the 18 foot, the 19 foot and the 20 foot of the second row of LEDU4 respectively, the 1 foot-10 foot of the second row of LEDU4 is connected with the positive pole of a direct current voltage source U5, the negative pole of the direct current voltage source U5 is connected with the 10 foot of the second driving chip U2, the 1 foot of the tenth short-circuit cap J10 is connected with the 11 foot of the second row of LEDU4, the tenth cap J10 is connected with the second row of LEDU 2, the 6 pin of the second driving chip U2 is connected with the first end of the sixteenth resistor R16, the first end of the seventeenth resistor R17 is connected with the first end of the sixteenth resistor R16, the second end of the seventeenth resistor R17 is grounded, the 6 pin of the second driving chip U2 is divided by the sixteenth resistor R16 and the seventeenth resistor R17 to obtain 3.5V voltage, the 4 pin and the 8 pin of the second driving chip U2 are respectively connected with the 6 pin of the first driving chip U1, the 2 pin of the second driving chip U2 is grounded, the 3 pin of the second driving chip U2 is connected with the positive electrode of the direct current voltage source U5, the 7 pin of the second driving chip U2 is connected with the 1 pin of the eighth shorting cap J8 after being connected with the third resistor R3 in series, the 2 pin of the eighth shorting cap J8 is grounded, the 5 pin of the second driving chip U2 is connected with the 1 pin of the fourth shorting cap J4, the 2 pin of the first shorting cap J1 is connected with the 5 pin of the second driving chip U2, the 9 feet of the second driving chip U2 are connected with the 3 feet of the double-pole double-throw switch SW1, the 1 feet and the 4 feet of the double-pole double-throw switch SW1 are respectively connected with the positive electrode of the direct-current voltage source U5, the 2 feet of the double-pole double-throw switch SW1 are connected with the 11 feet of the second driving chip U2, and the 5 feet of the double-pole double-throw switch SW1 are connected with the 1 feet of the second driving chip U2.
As a preferable aspect of the foregoing disclosure, the first driving chip U1 and the second driving chip U2 each select the LED display driver LM3914.
As a preferable aspect of the foregoing disclosure, the resistance of the fourth resistor R4 is 10kΩ, and the resistance of the fifth resistor R5 is 10kΩ.
As a preferable aspect of the foregoing disclosure, the resistance of the sixteenth resistor R16 is 1kΩ, and the resistance of the seventeenth resistor R17 is 2.5kΩ.
As the optimization of the technical scheme, the touch delay switch circuit comprises a first triode Q1, a second triode Q2, a third triode Q3, a second direct current voltage source U6, a third direct current voltage source U7, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R11, a first capacitor C1, a first diode D1 and a second adjustable resistor RV2, wherein the base electrode of the first triode Q1 is connected with the first end of the eleventh resistor R11, the collector electrode of the first triode Q1 is connected with the first end of the sixth resistor R6, the emitter electrode of the first triode Q1 is connected with the 1 pin of the second adjustable resistor RV2, the positive electrode of the second direct current voltage source U6 is connected with the collector electrode of the first triode Q1, the negative electrode of the second direct current voltage source U6 knows the emitter electrode of the first triode Q1, the base electrode of the second triode Q2 is connected with the emitter electrode of the first triode Q1, the collector of the second triode Q2 is connected with the first end of a seventh resistor R7, the second end of the seventh resistor R7 is connected with the second end of a sixth resistor R6, the emitter of the third triode Q2 is connected with the 2 pin of a second adjustable resistor RV2, the 3 pin of the second adjustable resistor RV2 is grounded, the positive electrode of a third direct current voltage source U7 is connected with the collector of the second triode Q2, the negative electrode of the third direct current voltage source U7 is connected with the emitter of the second triode Q2, the base of the third triode Q3 is connected with the eighth resistor R8 in series and then is connected with the collector of the second triode Q2, the emitter of the third triode Q3 is connected with the first end of a first capacitor C1, the second end of the first capacitor C1 is connected with the positive electrode of the third direct current voltage source U7, the collector of the third triode Q3 is connected with a first voltage Vo1, the first end of a ninth resistor R9 is connected with the first voltage Vo1, the second end of the ninth resistor R9 is grounded, the first end of a tenth resistor R10 is connected with the first voltage Vo1, the second end of the tenth resistor R10 is connected with the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is grounded.
As a preferred aspect of the foregoing technical solution, the self-oscillating circuit includes a fourth triode Q4, a fifth triode Q5, a second capacitor C2, a third capacitor C3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15, where a collector of the fourth triode Q4 is connected to a second end of the third capacitor C3, an emitter of the fourth triode Q4 is grounded, a base of the fourth triode Q4 is connected to a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to the second voltage Vo2, a collector of the fifth triode Q5 is connected to the second voltage Vo2, an emitter of the fifth triode Q5 is grounded, a base of the fifth triode Q5 is connected to a first end of the third capacitor C3, a second end of the third capacitor C3 is connected to a first end of the twelfth resistor R12, a second section of the twelfth resistor R12 is connected to a first end of the thirteenth resistor R13, a second end of the thirteenth resistor R13 is connected to a first end of the third capacitor C3, a second end of the thirteenth resistor R14 is connected to a first end of the thirteenth resistor R14, and a first end of the thirteenth resistor R14 is connected to a second end of the thirteenth resistor R15.
As a preferable aspect of the foregoing disclosure, the manual voltage regulating circuit includes a first adjustable resistor RV1, a 1 pin of the first adjustable resistor RV1 is grounded, and a 2 pin of the first adjustable resistor RV1 is connected to the third voltage Vo3.
The invention has the beneficial effects that: the three signal generating circuits of the touch delay switch circuit, the manual voltage regulating circuit and the self-oscillation circuit are adopted as level input sources of the level indicating circuit, the level change in the circuit operation is visually presented by the subsequent level indicating circuit, the level of the input signals can be visually reflected by the level of the LED column or the level of the two points of the LED, namely, the visual display circuit can also carry out measurement, comparison and analysis on the three signal generating circuits in the working process, the circuit selection application is effectively carried out, and the circuit is small in size and stable in operation; the short-circuit cap is arranged, so that the current in the circuit can be conveniently detected.
Description of the drawings:
the following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a prior art level indicating circuit diagram constructed with discrete components;
fig. 2 is a 4-level indicating circuit diagram constructed by an integrated chip D1405 in the prior art;
FIG. 3 is a schematic diagram of a 20-level indicating circuit of a multiple input source according to one embodiment of the invention;
FIG. 4 is a 20-level indicating circuit diagram of a multiple input source according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of an LM3914 application of one embodiment of the present invention;
FIG. 6 is a circuit diagram of a touch delay switch in accordance with one embodiment of the present invention;
FIG. 7 is a diagram of a self-oscillating circuit according to an embodiment of the present invention;
FIG. 8 is a manual voltage regulator circuit diagram of one embodiment of the present invention;
FIG. 9 is a power filter circuit diagram of an embodiment of the present invention;
fig. 10 is a 20-level indicating circuit printed circuit board diagram of a multiple input source according to one embodiment of the present invention.
The specific embodiment is as follows:
as shown in fig. 3 and 4, a 20-stage level indicating circuit of a multi-input source according to the present invention includes a level signal generating circuit, a 10-stage 0-2.5V level indicating circuit, and a 10-stage 2.5V-3.5V level indicating circuit.
The level signal generating circuit is a touch delay switch circuit or a manual voltage regulating circuit or a self-oscillation circuit.
The 10-level 0-2.5V level indicating circuit comprises a first driving chip U1, a first row of LED U3, a ninth short-circuit cap J9, a first resistor R1, a second resistor R2, a fourth resistor R4, a fifth resistor R5 and a seventh short-circuit cap J7, wherein the 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin and 10 pin of the first driving chip U1 are sequentially connected with the 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin and 20 pin of the first row of LED U3 respectively, the 1 pin-10 pin of the first row of LED U3 is connected with the positive electrode of a direct-current voltage source U5, the second end of the second resistor R2 is connected with the 11 pin of the first driving chip U1, the 1 pin of the ninth short-circuit cap J9 is connected with the 11 pin of the first row of LED U3, the ninth short-circuit cap J9 is connected with the first row of LED U1, the 6 pin of the first driving chip U1 is connected with the first end of a fourth resistor R4, the first end of a fifth resistor R5 is connected with the first end of the fourth resistor R4, the second end of the fifth resistor R5 is grounded, the 6 pin of the first driving chip U1 is divided by the fourth resistor R4 and the fifth resistor R5 to obtain 2.5V voltage, the 4 pin and the 8 pin of the first driving chip U1 are respectively grounded, the 2 pin of the first driving chip U1 is grounded, the 3 pin of the first driving chip U1 is connected with the positive electrode of a direct current voltage source U5, the 7 pin of the first driving chip U1 is connected with the 1 pin of a seventh short-circuit cap J7 after being connected with the first resistor R1 in series, the 2 pin of the seventh short-circuit cap J7 is grounded, the 5 pin of the first driving chip U1 is connected with the 1 pin of the fourth short-circuit cap J4, the 2 pin of the fourth short-circuit cap J4 is connected with the third voltage Vo3 in a manual voltage regulating circuit, the 2 feet of the first short circuit cap J1 are connected with the 5 feet of the first driving chip U1, the 1 feet of the first short circuit cap J1 are connected with the first voltage Vo1 of the touch delay switch circuit, the 3 feet of the first short circuit cap J1 are connected with the second voltage Vo2 of the self-oscillation circuit, and the 9 feet of the first driving chip U1 are connected with the 6 feet of the double-pole double-throw switch SW 1.
The 10-level 2.5V-3.5V level indicating circuit comprises a second driving chip U2, a second row of LEDU4, a tenth short-circuit cap J10, a third resistor R3, a sixteenth resistor R16, a seventeenth resistor R17 and an eighth short-circuit cap J8, wherein the 1 foot, the 18 foot, the 17 foot, the 16 foot, the 15 foot, the 14 foot, the 13 foot, the 12 foot, the 11 foot and the 10 foot of the second row of LEDU4 are respectively connected with the 11 foot, the 12 foot, the 13 foot, the 14 foot, the 15 foot, the 16 foot, the 17 foot, the 18 foot, the 19 foot and the 20 foot of the second row of LEDU4 respectively, the 1 foot-10 foot of the second row of LEDU4 is connected with the positive pole of a direct current voltage source U5, the negative pole of the direct current voltage source U5 is connected with the 10 foot of the second driving chip U2, the 1 foot of the tenth short-circuit cap J10 is connected with the 11 foot of the second row of LEDU4, the tenth cap J10 is connected with the second row of LEDU 2, the 6 pin of the second driving chip U2 is connected with the first end of the sixteenth resistor R16, the first end of the seventeenth resistor R17 is connected with the first end of the sixteenth resistor R16, the second end of the seventeenth resistor R17 is grounded, the 6 pin of the second driving chip U2 is divided by the sixteenth resistor R16 and the seventeenth resistor R17 to obtain 3.5V voltage, the 4 pin and the 8 pin of the second driving chip U2 are respectively connected with the 6 pin of the first driving chip U1, the 2 pin of the second driving chip U2 is grounded, the 3 pin of the second driving chip U2 is connected with the positive electrode of the direct current voltage source U5, the 7 pin of the second driving chip U2 is connected with the 1 pin of the eighth shorting cap J8 after being connected with the third resistor R3 in series, the 2 pin of the eighth shorting cap J8 is grounded, the 5 pin of the second driving chip U2 is connected with the 1 pin of the fourth shorting cap J4, the 2 pin of the first shorting cap J1 is connected with the 5 pin of the second driving chip U2, the 9 feet of the second driving chip U2 are connected with the 3 feet of the double-pole double-throw switch SW1, the 1 feet and the 4 feet of the double-pole double-throw switch SW1 are respectively connected with the positive electrode of the direct-current voltage source U5, the 2 feet of the double-pole double-throw switch SW1 are connected with the 11 feet of the second driving chip U2, and the 5 feet of the double-pole double-throw switch SW1 are connected with the 1 feet of the second driving chip U2.
The first driving chip U1 and the second driving chip U2 both select the LED display driver LM3914. As shown in fig. 5, LM3914 is a 10-bit led driver that converts input analog to digital output to drive a 10-bit led for dot display or column display. And 10 precise voltage dividing resistors are connected between the 4 pins and the 6 pins, a reference voltage source is arranged between the 7 pins and the 8 pins, the 9 pins are selected in a dot/column mode, the 9 pins and the 11 pins are connected (or the 9 pins are suspended) in a dot display mode, and the 9 pins and the 3 pins are connected in a strip display mode. The range of the power supply voltage of LM3914 is very wide, and can be selected from the range of 3-18V, and in practical application, 6-12V is usually adopted. And the 5 pin is a signal input end. And the voltage is added to the inverting input end of the internal 10-stage voltage comparator after passing through the internal high input impedance buffer, the non-inverting input end of each stage voltage comparator is biased on different comparison levels by a series of voltage dividing resistors, and the carry level of the 10-stage comparator is linearly changed because the voltage dividing resistors are all 1KΩ. The first 10 stages in this circuit are 10 stages indicating display of 0-2.5V, i.e. the LED is not lit when the 5 pin level of LM3914 is <0.25V, and 1 LED, 2 LED (or 2 nd LED) … … LED (or 10 th LED) is lit sequentially when the input level is >0.25V, 0.5V, 0.75V, 1V, 1.25V, 1.5V, 1.75V, 2V, 2.25V, 2.5V in this order. The last 10 levels are 10 level indication displays of 2.5-3.5V, i.e. 5 foot levels >2.6V, 2.7V, 2.8V V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V in order, with 1 LED, 2 LED (or 2 nd LED) … … th LED (or 10 th LED) of the last 10 LEDs being sequentially illuminated. The circuit has the flexibility that: (1) The level indicating circuits with different ranges can be realized by changing the power supply voltage by 3-18V and the level of the pins 4 and 6. (2) The brightness of the 10 LEDs can be regulated by external resistors R at two ends of 7 and 8. The current through each LED is approximately equal to 10 times the current in R. When the luminous efficiency of the LED is high, the current may be small to reduce power consumption.
The resistance value of the fourth resistor R4 is 10kΩ, and the resistance value of the fifth resistor R5 is 10kΩ.
The resistance value of the sixteenth resistor R16 is 1kΩ, and the resistance value of the seventeenth resistor R17 is 2.5kΩ.
As shown in fig. 6, the touch delay switch circuit includes a first triode Q1, a second triode Q2, a third triode Q3, a second direct current voltage source U6, a third direct current voltage source U7, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R11, a first capacitor C1, a first diode D1, and a second adjustable resistor RV2, wherein a base of the first triode Q1 is connected with a first end of the eleventh resistor R11, a collector of the first triode Q1 is connected with a first end of the sixth resistor R6, an emitter of the first triode Q1 is connected with a pin 1 of the second adjustable resistor RV2, an anode of the second direct current voltage source U6 is connected with a collector of the first triode Q1, a cathode of the second direct current voltage source U6 knows an emitter of the first triode Q1, a base of the second triode Q2 is connected with an emitter of the first triode Q1, the collector of the second triode Q2 is connected with the first end of a seventh resistor R7, the second end of the seventh resistor R7 is connected with the second end of a sixth resistor R6, the emitter of the third triode Q2 is connected with the 2 pin of a second adjustable resistor RV2, the 3 pin of the second adjustable resistor RV2 is grounded, the positive electrode of a third direct current voltage source U7 is connected with the collector of the second triode Q2, the negative electrode of the third direct current voltage source U7 is connected with the emitter of the second triode Q2, the base of the third triode Q3 is connected with the eighth resistor R8 in series and then is connected with the collector of the second triode Q2, the emitter of the third triode Q3 is connected with the first end of a first capacitor C1, the second end of the first capacitor C1 is connected with the positive electrode of the third direct current voltage source U7, the collector of the third triode Q3 is connected with a first voltage Vo1, the first end of a ninth resistor R9 is connected with the first voltage Vo1, the second end of the ninth resistor R9 is grounded, the first end of a tenth resistor R10 is connected with the first voltage Vo1, the second end of the tenth resistor R10 is connected with the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is grounded.
As shown in fig. 7, the self-oscillation circuit includes a fourth triode Q4, a fifth triode Q5, a second capacitor C2, a third capacitor C3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15, where a collector of the fourth triode Q4 is connected to a second end of the third capacitor C3, an emitter of the fourth triode Q4 is grounded, a base of the fourth triode Q4 is connected to a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to the second voltage Vo2, a collector of the fifth triode Q5 is connected to the second voltage Vo2, an emitter of the fifth triode Q5 is grounded, a base of the fifth triode Q5 is connected to a first end of the third capacitor C3, a second end of the third capacitor C3 is connected to a first end of the twelfth resistor R12, a second segment of the twelfth resistor R12 is connected to a first end of the thirteenth resistor R13, a second end of the thirteenth resistor R13 is connected to a first end of the third capacitor C3, a second end of the thirteenth resistor R14 is connected to a first end of the thirteenth resistor R14, and a first end of the thirteenth resistor R14 is connected to a second end of the thirteenth resistor R15.
As shown in fig. 8, the manual voltage regulating circuit includes a first adjustable resistor RV1, a pin 1 of the first adjustable resistor RV1 is grounded, and a pin 2 of the first adjustable resistor RV1 is connected to a third voltage Vo3.
Fig. 9 is a power filter circuit.
Working principle:
one of three level signal sources is selected by a selection switch circuit and used as the input level of a level indicating circuit, and two linear point/columnar 10-level LED display drivers LM3914 are used for cascading to form a 20-level indicating circuit. The comparison basis of the three level signal generating circuits is omitted for the sake of brevity.
Fig. 10 is a diagram of a printed circuit board of a 20-stage level indicating circuit of a multiple input source in this embodiment.
(1) The mark 1 is connected with a power supply, and the working voltage of the circuit is 5V;
(2) Three voltage signal sources are selected: the signal source selection is performed at the position of the mark 3, and the short circuit cap is connected with the upper left selected touch circuit signal; the short circuit cap is connected with a self-oscillation circuit signal selected from the lower left; the short circuit cap is connected with a manual adjustable circuit signal selected on the right side;
(3) The level of the touch signal indicates the working process of the circuit: the mark 3 is short-circuited, the cap is connected with the left upper selected touch circuit signal, after the power supply is electrified, the mark 2 is touched by a hand, 20 LEDs can be seen to be sequentially lightened from left to right, and then are gradually extinguished from right to left (assuming that the LM3914 works in a punctiform mode).
(4) The working process of the level indicating circuit of the self-oscillation circuit comprises the following steps: the short circuit cap is connected with the self-oscillating circuit signal selected from the left lower part of the mark 3, after the power supply is electrified, the circuit automatically operates, 20 LEDs are sequentially lightened from left to right according to the oscillating signal period determined by the self-oscillating circuit parameters, and then gradually extinguished from right to left (assuming that the LM3914 works in a punctiform mode).
(5) Manually adjusting the level of the voltage to indicate the working process of the circuit; the manual adjustable circuit signal is selected on the right side of the short circuit cap connection mark 3, the adjustable resistor of the mark 5 is rotated, the voltage is firstly increased and then reduced, 20 LEDs can be observed to sequentially light up from left to right and then gradually extinguished from right to left (the LM3914 is assumed to work in a dot mode).
(6) Columnar or dot level indication mode selection: the mark 6 is selected in a dot/column mode, the button of the mark 6 is pressed into a column mode, and the button of the mark 6 is sprung into a dot mode.
(7) Measuring current in the circuit: the mark 4 is a current measuring interface, and the short circuit cap at the mark 4 is removed to be connected with the universal meter in series to measure the current of the corresponding outgoing path.
The circuit observability:
(1) The level is visually distinguished by the number or position of the LEDs that are lit.
(2) Providing current monitoring points, such as by J7, J8, J9, J10 in FIG. 4, may facilitate detection of current in the circuit.
The 20-level indicating circuit of the multi-input source comprises a level signal generating circuit, a 10-level 0-2.5V level indicating circuit and a 10-level 2.5V-3.5V level indicating circuit, wherein two linear point/columnar 10-level LED display drivers LM3914 are used for cascading to form the 20-level indicating circuit; the three signal generating circuits of the touch delay switch circuit, the manual voltage regulating circuit and the self-oscillation circuit are adopted as level input sources of the level indicating circuit, the level change in the circuit operation is visually presented by the subsequent level indicating circuit, the level of the input signals can be visually reflected by the heights of the LED columns or the two points of the LEDs, namely, the three signal generating circuits can be measured and compared and analyzed in the visual display circuit working process, and the circuit is small in size and stable in operation; the short-circuit cap is arranged, so that the current in the circuit can be conveniently detected; the three voltage signal generating sources are collected together, so that the learning is convenient, and the method and the means are effective in saving the cost of teaching consumables, reducing environmental pollution and improving the teaching quality.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (1)
1. A 20-level indicating circuit of a multiple input source, characterized by: the device comprises a level signal generating circuit, a 10-level 0-2.5V level indicating circuit and a 10-level 2.5V-3.5V level indicating circuit;
the level signal generating circuit is a touch delay switch circuit or a manual voltage regulating circuit or a self-oscillation circuit;
the 10-level 0-2.5V level indicating circuit comprises a first driving chip U1, a first row of LED U3, a ninth short-circuit cap J9, a first resistor R1, a second resistor R2, a fourth resistor R4, a fifth resistor R5 and a seventh short-circuit cap J7, wherein the 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin and 10 pin of the first driving chip U1 are sequentially connected with the 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin and 20 pin of the first row of LED U3 respectively, the 1 pin-10 pin of the first row of LED U3 is connected with the positive electrode of a direct-current voltage source U5, the second end of the second resistor R2 is connected with the 11 pin of the first driving chip U1, the 1 pin of the ninth short-circuit cap J9 is connected with the 11 pin of the first row of LED U3, the ninth short-circuit cap J9 is connected with the first row of LED U1, the 6 pin of the first driving chip U1 is connected with the first end of a fourth resistor R4, the first end of a fifth resistor R5 is connected with the first end of the fourth resistor R4, the second end of the fifth resistor R5 is grounded, the 6 pin of the first driving chip U1 is divided by the fourth resistor R4 and the fifth resistor R5 to obtain 2.5V voltage, the 4 pin and the 8 pin of the first driving chip U1 are respectively grounded, the 2 pin of the first driving chip U1 is grounded, the 3 pin of the first driving chip U1 is connected with the positive electrode of a direct current voltage source U5, the 7 pin of the first driving chip U1 is connected with the 1 pin of a seventh short-circuit cap J7 after being connected with the first resistor R1 in series, the 2 pin of the seventh short-circuit cap J7 is grounded, the 5 pin of the first driving chip U1 is connected with the 1 pin of the fourth short-circuit cap J4, the 2 pin of the fourth short-circuit cap J4 is connected with the third voltage Vo3 in a manual voltage regulating circuit, the 2 pin of the first short circuit cap J1 is connected with the 5 pin of the first driving chip U1, the 1 pin of the first short circuit cap J1 is connected with the first voltage Vo1 of the touch delay switch circuit, the 3 pin of the first short circuit cap J1 is connected with the second voltage Vo2 of the self-oscillation circuit, and the 9 pin of the first driving chip U1 is connected with the 6 pin of the double-pole double-throw switch SW 1;
the 10-level 2.5V-3.5V level indicating circuit comprises a second driving chip U2, a second row of LEDU4, a tenth short-circuit cap J10, a third resistor R3, a sixteenth resistor R16, a seventeenth resistor R17 and an eighth short-circuit cap J8, wherein the 1 foot, the 18 foot, the 17 foot, the 16 foot, the 15 foot, the 14 foot, the 13 foot, the 12 foot, the 11 foot and the 10 foot of the second row of LEDU4 are respectively connected with the 11 foot, the 12 foot, the 13 foot, the 14 foot, the 15 foot, the 16 foot, the 17 foot, the 18 foot, the 19 foot and the 20 foot of the second row of LEDU4 respectively, the 1 foot-10 foot of the second row of LEDU4 is connected with the positive pole of a direct current voltage source U5, the negative pole of the direct current voltage source U5 is connected with the 10 foot of the second driving chip U2, the 1 foot of the tenth short-circuit cap J10 is connected with the 11 foot of the second row of LEDU4, the tenth cap J10 is connected with the second row of LEDU 2, the 6 pin of the second driving chip U2 is connected with the first end of the sixteenth resistor R16, the first end of the seventeenth resistor R17 is connected with the first end of the sixteenth resistor R16, the second end of the seventeenth resistor R17 is grounded, the 6 pin of the second driving chip U2 is divided by the sixteenth resistor R16 and the seventeenth resistor R17 to obtain 3.5V voltage, the 4 pin and the 8 pin of the second driving chip U2 are respectively connected with the 6 pin of the first driving chip U1, the 2 pin of the second driving chip U2 is grounded, the 3 pin of the second driving chip U2 is connected with the positive electrode of the direct current voltage source U5, the 7 pin of the second driving chip U2 is connected with the 1 pin of the eighth shorting cap J8 after being connected with the third resistor R3 in series, the 2 pin of the eighth shorting cap J8 is grounded, the 5 pin of the second driving chip U2 is connected with the 1 pin of the fourth shorting cap J4, the 2 pin of the first shorting cap J1 is connected with the 5 pin of the second driving chip U2, the pin 9 of the second driving chip U2 is connected with the pin 3 of the double-pole double-throw switch SW1, the pin 1 and the pin 4 of the double-pole double-throw switch SW1 are respectively connected with the positive electrode of the direct-current voltage source U5, the pin 2 of the double-pole double-throw switch SW1 is connected with the pin 11 of the second driving chip U2, and the pin 5 of the double-pole double-throw switch SW1 is connected with the pin 1 of the second driving chip U2;
the first driving chip U1 and the second driving chip U2 select an LED display driver LM3914;
the resistance value of the fourth resistor R4 is 10k omega, and the resistance value of the fifth resistor R5 is 10k omega;
the resistance value of the sixteenth resistor R16 is 1kΩ, and the resistance value of the seventeenth resistor R17 is 2.5kΩ;
the touch delay switch circuit comprises a first triode Q1, a second triode Q2, a third triode Q3, a second direct current voltage source U6, a third direct current voltage source U7, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a first diode D1 and a second adjustable resistor RV2, wherein the base electrode of the first triode Q1 is connected with the first end of an eleventh resistor R11, the collector electrode of the first triode Q1 is connected with the first end of a sixth resistor R6, the emitter electrode of the first triode Q1 is connected with the 1 pin of a second adjustable resistor RV2, the positive electrode of the second direct current voltage source U6 is connected with the collector electrode of the first triode Q1, the negative electrode of the second direct current voltage source U6 knows the emitter electrode of the first triode Q1, the base electrode of the second triode Q2 is connected with the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected with the second end of the sixth resistor R6, the emitter of the second triode Q2 is connected with the 2 pin of the second adjustable resistor RV2, the 3 pin of the second adjustable resistor RV2 is grounded, the positive electrode of the third direct current voltage source U7 is connected with the collector of the second triode Q2, the negative electrode of the third direct current voltage source U7 is connected with the emitter of the second triode Q2, the base of the third triode Q3 is connected with the eighth resistor R8 in series and then is connected with the collector of the second triode Q2, the emitter of the third triode Q3 is connected with the first end of the first capacitor C1, the second end of the first capacitor C1 is connected with the positive electrode of the third direct current voltage source U7, the collector of the third triode Q3 is connected with the first voltage Vo1, the first end of the ninth resistor R9 is connected with the first voltage Vo1, the second end of the tenth resistor R10 is connected with the second end of the first diode D1, the cathode of the first diode D1 is grounded;
the self-oscillation circuit comprises a fourth triode Q4, a fifth triode Q5, a second capacitor C2, a third capacitor C3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, wherein the collector of the fourth triode Q4 is connected with the second end of the third capacitor C3, the emitter of the fourth triode Q4 is grounded, the base of the fourth triode Q4 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 is connected with a second voltage Vo2, the collector of the fifth triode Q5 is connected with a second voltage Vo2, the emitter of the fifth triode Q5 is grounded, the base of the fifth triode Q5 is connected with the first end of the third capacitor C3, the second end of the third capacitor C3 is connected with the first end of the twelfth resistor R12, the second section of the twelfth resistor R12 is connected with the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13 is connected with the first end of the third capacitor C3, the first end of the fourteenth resistor R14 is connected with the first end of the thirteenth resistor R13, and the second end of the fourteenth resistor R14 is connected with the second end of the fourteenth resistor R2;
the manual voltage regulating circuit comprises a first adjustable resistor RV1, a 1 pin of the first adjustable resistor RV1 is grounded, and a 2 pin of the first adjustable resistor RV1 is connected with a third voltage Vo3.
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| CN106255267A (en) * | 2016-08-25 | 2016-12-21 | 成都东创精英科技有限公司 | A kind of outdoor LED large display screen signal level adjustment type light control system |
| CN207366621U (en) * | 2017-10-11 | 2018-05-15 | 绍兴职业技术学院 | A kind of 20 grades of level indicating circuits of multiple input sources |
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| GB1568576A (en) * | 1977-05-03 | 1980-06-04 | Chronolog Syst | Electrical circuit means for use in analogue display |
| US4686459A (en) * | 1984-09-25 | 1987-08-11 | U.S. Philips Corporation | Level indicator |
| CN85103875A (en) * | 1985-05-11 | 1986-11-05 | 菲利浦光灯制造公司 | Level indicator |
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| CN107561330A (en) | 2018-01-09 |
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