CN107561330A - A kind of 20 grades of level indicating circuits of multiple input sources - Google Patents
A kind of 20 grades of level indicating circuits of multiple input sources Download PDFInfo
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Abstract
The invention discloses a kind of the 20 of multiple input sources grade level indicating circuit, including level signal generation circuit, 10 grades of 0~2.5V level indicating circuits, 10 grades of 2.5V~3.5V level indicating circuits, 20 grades of level indicating circuits are formed using two pieces of Linear Points/columns, 10 grades of LED display drivers LM3914 cascades；It uses the level input source of touching delay-action switch circuit, three kinds of manual voltage regulation circuit, self-maintained circuit signal generating circuits as level indicating circuit, the change of level is intuitively presented with follow-up level indicating circuit during circuit is run, LED posts or 2 points of LED height reflection incoming signal level height can be can be visually seen, i.e. the vivid displaying circuit course of work can measure comparative analysis to three kinds of signal generating circuits again, circuit selection application is effectively carried out, it is circuit small volume, stable；It is by setting short circuit cap, in that context it may be convenient to detects the electric current in circuit.
Description
Technical field：
The invention belongs to level indicating circuit technical field, a kind of 20 grades of level indicating electricity of multiple input sources are specifically related to
Road.
Background technology：
Level indicating circuit be by intuitively bright spot is how many or height in a manner of represent level height, existing level indicating
Circuit mainly has two kinds, and one of which is built with discrete component, mainly the application to diode, triode, such as Fig. 1 institutes
Show, work as Ui>During 0.6V~0.7V, VT1 is changed into turning on from ending, and LED1 is lighted, and later Ui often increases about 0.7V, and follow-up LED is just
One is lit, signal is intuitively shown with this, its circuit volume is larger, technically compared with based on；Another is
With the level indicating circuit built of dedicated IC chip, as shown in Fig. 2 the 4 grades of electricity built using integrated chip D1405
Flat indicating circuit, D1405 level indicatings drive integrated circult represents incoming signal level with 5 bar-shaped light emitting diodes, interior
Portion is equipped with the constant current output device that can directly drive LED, thus during change supply voltage, flowing through the electric current of light emitting diode will not send out
Changing.The circuit work power voltage range is wide, can normal work in 4.4~12V voltages.Internal direct current amplifier.Open
Ring gain>30DB.And the response time of lighting/light-off amplifications can be changed according to the resistance outside the pin of integrated package 15 and electric capacity
Utensil has very high input impedance, but its input source is single, it is impossible to is analyzed, it is impossible to the suitable electricity of selection on demand
Road.
The content of the invention：
Therefore, the technical problems to be solved by the invention are that level indicating circuit volume of the prior art is big, inputs
Source is single, can not be analyzed, it is impossible to suitable circuit is selected on demand, so as to propose a kind of the 20 of multiple input sources grades of level
Indicating circuit.
To reach above-mentioned purpose, technical scheme is as follows：
A kind of 20 grades of level indicating circuits of multiple input sources, including level signal generation circuit, 10 grades of 0~2.5V level refer to
Show circuit and 10 grades of 2.5V~3.5V level indicating circuits.
The level signal generation circuit is touching delay-action switch circuit or manual voltage regulation circuit or self-maintained circuit.
10 grades of 0~2.5V level indicating circuits include the first driving chip U1, first row type LEDU3, the 9th short circuit
Cap J9, first resistor R1, second resistance R2, the 4th resistance R4, the 5th resistance R5, the 7th short circuit cap J7, the first driving core
Piece U1 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin, 10 pin successively respectively with the first row type
LEDU3 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin, 20 pin are connected, the first row type
The LEDU3 pin of 1 pin -10 connects direct voltage source U5 positive pole, the second end connection described first of the second resistance R2 respectively
Driving chip U1 11 pin, 1 pin of the 9th short circuit cap J9 connect 11 pin of the first row type LEDU3, and the described 9th is short
Road cap J9 2 pin connect 1 pin of the first driving chip U1, and 6 pin of the first driving chip U1 connect the 4th resistance R4
First end, the first end of the 5th resistance R5 connects the first end of the 4th resistance R4, the of the 5th resistance R5
Two ends are grounded, and 6 pin of the first driving chip U1 obtain after the 4th resistance R4 and the 5th resistance R5 partial pressures
2.5V voltages, 4 pin and 8 pin of the first driving chip U1 are grounded respectively, the 2 pin ground connection of the first driving chip U1, institute
State the first driving chip U1 3 pin connection direct voltage source U5 positive pole, the electricity of 7 pin series connection first of the first driving chip U1
The 7th short circuit cap J7 1 pin, the 2 pin ground connection of the 7th short circuit cap J7,5 pin of the first driving chip U1 are connected after resistance R1
The 4th short circuit cap J4 1 pin is connected, 2 pin of the 4th short circuit cap J4 connect the tertiary voltage Vo3 in manual voltage regulation circuit, the
One short circuit cap J1 2 pin connect 5 pin of the first driving chip U1, the first short circuit cap J1 1 pin connection touching delay-action switch
The second voltage Vo2 of the first voltage Vo1, the first short circuit cap J1 of circuit 3 pin connection self-maintained circuit, first driving
Chip U1 9 pin connection double-point double-throw switch SW1 6 pin.
10 grades of 2.5V~3.5V level indicating circuits include the second driving chip U2, second row type LEDU4, the tenth short
Road cap J10,3rd resistor R3, the 16th resistance R16, the 17th resistance R17, the 8th short circuit cap J8, second driving chip
U2 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin, 10 pin successively respectively with the second row type
LEDU4 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin, 20 pin are connected, the second row type
The LEDU4 pin of 1 pin -10 connects direct voltage source U5 positive pole, the negative pole connection described second of the direct voltage source U5 respectively
Driving chip U2 10 pin, 1 pin of the tenth short circuit cap J10 connect 11 pin of the second row type LEDU4, and the described tenth is short
Road cap J10 2 pin connect 1 pin of the second driving chip U2, and 6 pin of the second driving chip U2 connect the 16th resistance
R16 first end, first end connection the 16th resistance R16 of the 17th resistance R17 first end, the described 17th
Resistance R17 the second end ground connection, 6 pin of the second driving chip U2 pass through the 16th resistance R16 and the described 17th
3.5V voltages are obtained after resistance R17 partial pressures, 4 pin and 8 pin of the second driving chip U2 connect first driving chip respectively
U1 6 pin, the 2 pin ground connection of the second driving chip U2, the 3 pin connection direct voltage source U5's of the second driving chip U2
Positive pole, the 8th short circuit cap J8 1 pin is connected after the 7 pin series connection 3rd resistor R3 of the second driving chip U2, the described 8th is short
Road cap J8 2 pin ground connection, the 4th short circuit cap J4 of 5 pin connection of the second driving chip U2 1 pin, the 2 of the first short circuit cap J1
Pin connects 5 pin of the second driving chip U2, and 9 pin of the second driving chip U2 connect the 3 of double-point double-throw switch SW1
Pin, 1 pin and 4 pin of the double-point double-throw switch SW1 connect the positive pole of the direct voltage source U5 respectively, and the DPDT is opened
2 pin for closing SW1 connect 11 pin of the second driving chip U2, and the 5 pin connection described second of the double-point double-throw switch SW1 is driven
Dynamic chip U2 1 pin.
As the preferred of above-mentioned technical proposal, the first driving chip U1 and the second driving chip U2 choose
LED display drivers LM3914.
As the preferred of above-mentioned technical proposal, the resistance of the 4th resistance R4 is 10k Ω, the resistance of the 5th resistance R5
It is worth for 10k Ω.
As the preferred of above-mentioned technical proposal, the resistance of the 16th resistance R16 is 1k Ω, the 17th resistance
R17 resistance is 2.5k Ω.
As the preferred of above-mentioned technical proposal, the touching delay-action switch circuit includes the first triode Q1, the two or three pole
Pipe Q2, the 3rd triode Q3, the second direct voltage source U6, the 3rd direct voltage source U7, the 6th resistance R6, the 7th resistance R7,
Eight resistance R8, the 9th resistance R9, the tenth resistance R11, the first electric capacity C1, the first diode D1, the second adjustable resistance RV2, first
Triode Q1 base stage connects the 11st resistance R11 first end, and the first triode Q1 colelctor electrode connects the 6th resistance R6's
First end, the first triode Q1 emitter stage connect the second adjustable resistance RV2 1 pin, and the second direct voltage source U6 positive pole connects
Connecing the first triode Q1 colelctor electrode, the second direct voltage source U6 negative pole understands the first triode Q1 emitter stage, and the two or three
Pole pipe Q2 base stage connects the first triode Q1 emitter stage, and the second triode Q2 colelctor electrode connects the first of the 7th resistance R7
End, the 7th resistance R7 the second end connect the 6th resistance R6 the second end, and the 3rd triode Q2 emitter stage connection second is adjustable
Resistance RV2 2 pin, the second adjustable resistance RV2 3 pin ground connection, the 3rd direct voltage source U7 positive pole connect the second triode Q2
Colelctor electrode, the 3rd direct voltage source U7 negative pole connects the second triode Q2 emitter stage, the 3rd triode Q3 base stage string
Join the colelctor electrode that the second triode Q2 is connected after the 8th resistance R8, the 3rd triode Q3 emitter stage connects the of the first electric capacity C1
One end, the first electric capacity C1 the second end connect the 3rd direct voltage source U7 positive pole, the 3rd triode Q3 colelctor electrode connection the
One voltage Vo1, the 9th resistance R9 first end connection first voltage Vo1, the 9th resistance R9 the second end ground connection, the tenth resistance
R10 first end connection first voltage Vo1, the tenth resistance R10 the second end connect the first diode D1 positive pole, the one or two pole
Pipe D1 negative pole ground connection.
As the preferred of above-mentioned technical proposal, the self-maintained circuit include the 4th triode Q4, the 5th triode Q5,
Second electric capacity C2, the 3rd electric capacity C3, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance
R15, the 4th triode Q4 the 3rd electric capacity C3 of colelctor electrode connection the second end, the 4th triode Q4 grounded emitter, the 4th
Triode Q4 the second electric capacity C2 of base stage connection first end, the second electric capacity C2 the second end connection second voltage Vo2, the five or three
Pole pipe Q5 colelctor electrode connection second voltage Vo2, the 5th triode Q5 grounded emitter, the 5th triode Q5 base stage connection
3rd electric capacity C3 first end, the 3rd electric capacity C3 the second end connect the 12nd resistance R12 first end, the 12nd resistance R12
Second segment connect the 13rd resistance R13 first end, the 13rd resistance R13 the second end connects the first of the 3rd electric capacity C3
End, the 14th resistance R14 first end connect the 13rd resistance R13 first end, the 14th resistance R14 the second end connection the
Two electric capacity C2 first end, the 15th resistance R15 first end connect the 13rd resistance R14 first end, the 15th resistance R15
The second end connect the second electric capacity C2 the second end.
As the preferred of above-mentioned technical proposal, the manual voltage regulation circuit includes the first adjustable resistance RV1, and described first can
Adjust resistance RV1 1 pin ground connection, the first adjustable resistance RV1 2 pin connection tertiary voltage Vo3.
The beneficial effects of the present invention are：It uses touching delay-action switch circuit, manual voltage regulation circuit, self-maintained circuit
Level input source of three kinds of signal generating circuits as level indicating circuit, the follow-up electricity of the change of level during circuit is run
Flat indicating circuit is intuitively presented, and can be visually seen LED posts or 2 points of LED height reflection incoming signal level height, i.e., vivid
The displaying circuit course of work can measure comparative analysis to three kinds of signal generating circuits again, effectively carry out circuit selection should
With, circuit small volume, stable；It is by setting short circuit cap, in that context it may be convenient to detects the electric current in circuit.
Brief description of the drawings：
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is a kind of level indicating circuit figure built with discrete component in the prior art；
Fig. 2 is 4 grades of level indicating circuit figures that a kind of integrated chip D1405 is built in the prior art；
Fig. 3 is a kind of 20 grades of level indicating circuit schematic diagrams of multiple input sources of one embodiment of the invention；
Fig. 4 is a kind of 20 grades of level indicating circuit figures of multiple input sources of one embodiment of the invention；
Fig. 5 is the LM3914 application principle figures of one embodiment of the invention；
Fig. 6 is the touching delay-action switch circuit diagram of one embodiment of the invention；
Fig. 7 is the self-maintained circuit figure of one embodiment of the invention；
Fig. 8 is the manual voltage regulation circuit diagram of one embodiment of the invention；
Fig. 9 is the electric source filter circuit figure of one embodiment of the invention；
Figure 10 is a kind of 20 grades of level indicating circuit diagram of printed circuit board of multiple input sources of one embodiment of the invention.
Embodiment：
As shown in Figure 3, Figure 4,20 grades of level indicating circuits of a kind of multiple input sources of the invention, including level signal produce
Circuit, 10 grades of 0~2.5V level indicating circuits and 10 grades of 2.5V~3.5V level indicating circuits.
The level signal generation circuit is touching delay-action switch circuit or manual voltage regulation circuit or self-maintained circuit.
10 grades of 0~2.5V level indicating circuits include the first driving chip U1, first row type LEDU3, the 9th short circuit
Cap J9, first resistor R1, second resistance R2, the 4th resistance R4, the 5th resistance R5, the 7th short circuit cap J7, the first driving core
Piece U1 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin, 10 pin successively respectively with the first row type
LEDU3 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin, 20 pin are connected, the first row type
The LEDU3 pin of 1 pin -10 connects direct voltage source U5 positive pole, the second end connection described first of the second resistance R2 respectively
Driving chip U1 11 pin, 1 pin of the 9th short circuit cap J9 connect 11 pin of the first row type LEDU3, and the described 9th is short
Road cap J9 2 pin connect 1 pin of the first driving chip U1, and 6 pin of the first driving chip U1 connect the 4th resistance R4
First end, the first end of the 5th resistance R5 connects the first end of the 4th resistance R4, the of the 5th resistance R5
Two ends are grounded, and 6 pin of the first driving chip U1 obtain after the 4th resistance R4 and the 5th resistance R5 partial pressures
2.5V voltages, 4 pin and 8 pin of the first driving chip U1 are grounded respectively, the 2 pin ground connection of the first driving chip U1, institute
State the first driving chip U1 3 pin connection direct voltage source U5 positive pole, the electricity of 7 pin series connection first of the first driving chip U1
The 7th short circuit cap J7 1 pin, the 2 pin ground connection of the 7th short circuit cap J7,5 pin of the first driving chip U1 are connected after resistance R1
The 4th short circuit cap J4 1 pin is connected, 2 pin of the 4th short circuit cap J4 connect the tertiary voltage Vo3 in manual voltage regulation circuit, the
One short circuit cap J1 2 pin connect 5 pin of the first driving chip U1, the first short circuit cap J1 1 pin connection touching delay-action switch
The second voltage Vo2 of the first voltage Vo1, the first short circuit cap J1 of circuit 3 pin connection self-maintained circuit, first driving
Chip U1 9 pin connection double-point double-throw switch SW1 6 pin.
10 grades of 2.5V~3.5V level indicating circuits include the second driving chip U2, second row type LEDU4, the tenth short
Road cap J10,3rd resistor R3, the 16th resistance R16, the 17th resistance R17, the 8th short circuit cap J8, second driving chip
U2 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin, 10 pin successively respectively with the second row type
LEDU4 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin, 20 pin are connected, the second row type
The LEDU4 pin of 1 pin -10 connects direct voltage source U5 positive pole, the negative pole connection described second of the direct voltage source U5 respectively
Driving chip U2 10 pin, 1 pin of the tenth short circuit cap J10 connect 11 pin of the second row type LEDU4, and the described tenth is short
Road cap J10 2 pin connect 1 pin of the second driving chip U2, and 6 pin of the second driving chip U2 connect the 16th resistance
R16 first end, first end connection the 16th resistance R16 of the 17th resistance R17 first end, the described 17th
Resistance R17 the second end ground connection, 6 pin of the second driving chip U2 pass through the 16th resistance R16 and the described 17th
3.5V voltages are obtained after resistance R17 partial pressures, 4 pin and 8 pin of the second driving chip U2 connect first driving chip respectively
U1 6 pin, the 2 pin ground connection of the second driving chip U2, the 3 pin connection direct voltage source U5's of the second driving chip U2
Positive pole, the 8th short circuit cap J8 1 pin is connected after the 7 pin series connection 3rd resistor R3 of the second driving chip U2, the described 8th is short
Road cap J8 2 pin ground connection, the 4th short circuit cap J4 of 5 pin connection of the second driving chip U2 1 pin, the 2 of the first short circuit cap J1
Pin connects 5 pin of the second driving chip U2, and 9 pin of the second driving chip U2 connect the 3 of double-point double-throw switch SW1
Pin, 1 pin and 4 pin of the double-point double-throw switch SW1 connect the positive pole of the direct voltage source U5 respectively, and the DPDT is opened
2 pin for closing SW1 connect 11 pin of the second driving chip U2, and the 5 pin connection described second of the double-point double-throw switch SW1 is driven
Dynamic chip U2 1 pin.
The first driving chip U1 and the second driving chip U2 choose LED display drivers LM3914.Such as Fig. 5
Shown, LM3914 is 10 LED drives, and it can be converted to input analog amount digital output and drive 10
Light emitting diode shows to carry out a display or post.Be connected with 10 accurate divider resistances between 4 pin and 6 pin, 7 pin and 8 pin it
Between be a reference voltage source, 9 pin are point/post model selection, 9,11 pin connect (or 9 pin are hanging) shown for point-like, 9,3 pin phases
Strip is connected in show.LM3914 supply voltage scope is very wide, can be selected in the range of 3-18V, in practical application, generally takes
6—12V.5 pin are signal input part.And the anti-phase of internal 10 step voltage comparators is added to after internal high input impedance buffer
Input, it is biased in per the in-phase input end of step voltage comparator by a string of divider resistances on different comparative levels, due to dividing
Piezoresistance is 1K Ω, therefore the bit level that enters of 10 grades of comparators linearly changes.First 10 grades are the 10 of 0-2.5V in this circuit
Level instruction display, the i.e. 5 pin level of LM3914<LED does not work during 0.25V, when incoming level successively>0.25V、0.5V、0.75V、
When 1V, 1.25V, 1.5V, 1.75V, 2V, 2.25V, 2.5V, bright 1 LED, 2 LED (or the 2nd LED) ... 10 successively
LED (or the 10th LED).10 grades are 10 grades of 2.5-3.5V instruction displays afterwards, i.e. 5 pin level are successively>2.6V、2.7V、2.8V
V, when 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, it is bright successively after 1 LED in 10 LED, 2 LED the (or the 2nd
Individual LED) ... 10 LED (or the 10th LED).The circuit flexibility is：(1) change 3-18V of supply voltage, change 4,6
Pin level can realize the level indicating circuit of different range.(2) 10 LED brightness can be adjusted by the outer meeting resistance R of 7,8 bipods
Section.10 times of electric current in R are substantially equal to by each LED electric current.When LED luminous efficiency is higher, electric current can be with small
Some, to reduce power consumption.
The resistance of the 4th resistance R4 is 10k Ω, and the resistance of the 5th resistance R5 is 10k Ω.
The resistance of the 16th resistance R16 is 1k Ω, and the resistance of the 17th resistance R17 is 2.5k Ω.
As shown in fig. 6, the touching delay-action switch circuit includes the first triode Q1, the second triode Q2, the three or three pole
Pipe Q3, the second direct voltage source U6, the 3rd direct voltage source U7, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th
Resistance R9, the tenth resistance R11, the first electric capacity C1, the first diode D1, the second adjustable resistance RV2, the first triode Q1 base stage
The 11st resistance R11 first end is connected, the first triode Q1 colelctor electrode connects the 6th resistance R6 first end, the one or three pole
Pipe Q1 emitter stage connects the second adjustable resistance RV2 1 pin, and the second direct voltage source U6 positive pole connects the first triode Q1's
Colelctor electrode, the second direct voltage source U6 negative pole understand the first triode Q1 emitter stage, the second triode Q2 base stage connection
First triode Q1 emitter stage, the second triode Q2 colelctor electrode connect the 7th resistance R7 first end, the 7th resistance R7's
Second end connects the 6th resistance R6 the second end, and the 3rd triode Q2 emitter stage connects the second adjustable resistance RV2 2 pin, the
Two adjustable resistance RV2 3 pin ground connection, the 3rd direct voltage source U7 positive pole connect the second triode Q2 colelctor electrode, and the 3rd is straight
The negative pole for flowing voltage source U7 connects the second triode Q2 emitter stage, connects after the 3rd triode Q3 resistance R8 of base series the 8th
The second triode Q2 colelctor electrode is connect, the 3rd triode Q3 emitter stage connects the first electric capacity C1 first end, the first electric capacity C1
The second end connect the 3rd direct voltage source U7 positive pole, the 3rd triode Q3 colelctor electrode connection first voltage Vo1, the 9th electricity
Hinder R9 first end connection first voltage Vo1, the 9th resistance R9 the second end ground connection, the tenth resistance R10 first end connection the
One voltage Vo1, the tenth resistance R10 the second end connects the first diode D1 positive pole, the first diode D1 negative pole ground connection.
As shown in fig. 7, the self-maintained circuit includes the 4th triode Q4, the 5th triode Q5, the second electric capacity C2, the
Three electric capacity C3, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15, the 4th triode Q4
Colelctor electrode connect the 3rd electric capacity C3 the second end, the 4th triode Q4 grounded emitter, the 4th triode Q4 base stage connects
The second electric capacity C2 first end is connect, the second electric capacity C2 the second end connection second voltage Vo2, the 5th triode Q5 colelctor electrode connect
Second voltage Vo2, the 5th triode Q5 grounded emitter are met, the 5th triode Q5 base stage connects the first of the 3rd electric capacity C3
End, the 3rd electric capacity C3 the second end connect the 12nd resistance R12 first end, the 12nd resistance R12 second segment connection the tenth
Three resistance R13 first end, the 13rd resistance R13 the second end connect the 3rd electric capacity C3 first end, the 14th resistance R14's
First end connects the 13rd resistance R13 first end, and the 14th resistance R14 the second end connects the second electric capacity C2 first end,
15th resistance R15 first end connects the 13rd resistance R14 first end, the 15th resistance R15 the second end connection second
Electric capacity C2 the second end.
As shown in figure 8, the manual voltage regulation circuit includes the first adjustable resistance RV1, the 1 of the first adjustable resistance RV1
Pin is grounded, the first adjustable resistance RV1 2 pin connection tertiary voltage Vo3.
Fig. 9 is electric source filter circuit.
Operation principle：
One of three kinds of level signal sources are selected by selected on-off circuit, as the incoming level of level indicating circuit, profit
20 grades of level indicating circuits are formed with two pieces of Linear Points/columns, 10 grades of LED display drivers LM3914 cascades.Three kinds of level signals
Generation circuit comparison basis, principle repeat no more.
Figure 10 is a kind of diagram of printed circuit board of 20 grades of level indicating circuits of multiple input sources in the present embodiment.
(1) power supply, circuit voltage 5V are met at mark 1；
The selection of (2) three kinds of voltage signal sources：Identify and selected at 3 for signal source, short circuit cap connects upper left and chooses touch circuit
Signal；Short circuit cap connects lower-left and chooses self-oscillating circuit signal；Short circuit cap connects right side and chooses manual conditioned circuit signal；
(3) the level indicating circuit course of work of touch signal：Identify 3 short circuit caps and connect upper left and choose touch circuit signal,
Power supply be powered after, with hand touching mark 2, it can be seen that 20 LED are from left to right lighted successively, then gradually by the right side turn left extinguishings (vacation
If LM3914 is operated in point-like pattern).
(4) the level indicating circuit course of work of self-maintained circuit：Short circuit cap connects 3 lower-lefts of mark and chooses self-oscillating circuit
Signal, power supply be powered after, circuit automatic running, made by the oscillator signal period that self-oscillating circuit parameter determines 20 LED from
It is left-to-right to light successively, then gradually turned left extinguishing (assuming that LM3914 is operated in point-like pattern) by the right side.
(5) the level indicating circuit course of work of voltage is manually adjusted；Short circuit cap connects the right side of mark 3 and chooses manual adjustable electric
Road signal, the adjustable resistance of rotating mark 5, it is assumed that voltage first increases and reduced again, and it is from left to right bright successively to can observe 20 LED
Rise, then gradually turned left extinguishing (assuming that LM3914 is operated in point-like pattern) by the right side.
(6) column or point-like level indicating mode select：Mark 6 is point/post condition selecting, and the button for identifying 6 is pressed
For cylinder mode, the button for identifying 6 is upspring as point-like pattern.
(7) electric current in measuring circuit：For mark 4 to survey current interface, universal meter can be sealed in by removing the short circuit cap at mark 4
Measure the electric current in corresponding outlet.
This circuit observability：
(1) level height is intuitively distinguished by lighting LED number or position.
(2) current monitoring point is provided with, the electric current in circuit such as can be conveniently detected by J7, J8, J9, J10 in Fig. 4.
A kind of 20 grades of level indicating circuits of multiple input sources described in the present embodiment, including level signal generation circuit, 10
0~2.5V of level level indicating circuits, 10 grades of 2.5V~3.5V level indicating circuits, are shown using two pieces of Linear Points/columns, 10 grades of LED
Show that driver LM3914 cascades form 20 grades of level indicating circuits；Its use touching delay-action switch circuit, manual voltage regulation circuit, from
Level input source of the three kinds of signal generating circuits of excited oscillation circuit as level indicating circuit, the change of level during circuit is run
Intuitively presented with follow-up level indicating circuit, the height reflection incoming signal level that can be visually seen 2 points of LED posts or LED is high
Low, i.e., the vivid displaying circuit course of work can measure comparative analysis to three kinds of signal generating circuits again, circuit small volume,
It is stable；It is by setting short circuit cap, in that context it may be convenient to detects the electric current in circuit；Three kinds of voltage signal generating sources are collected
Together, convenient study, and the effective ways and hand for saving teaching consumables cost, reducing environmental pollution, improving the quality of teaching
Section.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (7)
- A kind of 1. 20 grades of level indicating circuits of multiple input sources, it is characterised in that：Including level signal generation circuit, 10 grade 0~ 2.5V level indicating circuits and 10 grades of 2.5V~3.5V level indicating circuits；The level signal generation circuit is touching delay-action switch circuit or manual voltage regulation circuit or self-maintained circuit；10 grades of 0~2.5V level indicating circuits include the first driving chip U1, first row type LEDU3, the 9th short circuit cap J9, First resistor R1, second resistance R2, the 4th resistance R4, the 5th resistance R5, the 7th short circuit cap J7, the first driving chip U1's 1 pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin, 10 pin are successively respectively with the first row type LEDU3's 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin, 20 pin are connected, and 1 pin of the first row type LEDU3- 10 pin connect direct voltage source U5 positive pole respectively, and the second end of the second resistance R2 connects the first driving chip U1's 11 pin, 1 pin of the 9th short circuit cap J9 connect 11 pin of the first row type LEDU3, and 2 pin of the 9th short circuit cap J9 connect 1 pin of the first driving chip U1 is connect, 6 pin of the first driving chip U1 connect the 4th resistance R4 first end, described 5th resistance R5 first end connects the first end of the 4th resistance R4, and the second end ground connection of the 5th resistance R5 is described First driving chip U1 6 pin after the 4th resistance R4 and the 5th resistance R5 partial pressures 2.5V voltages, described the One driving chip U1 4 pin and 8 pin are grounded respectively, the 2 pin ground connection of the first driving chip U1, the first driving chip U1 3 pin connection direct voltage source U5 positive pole, connection the 7th is short after the 7 pin series connection first resistor R1 of the first driving chip U1 Road cap J7 1 pin, the 2 pin ground connection of the 7th short circuit cap J7,5 pin of the first driving chip U1 connect the 4th short circuit cap J4 1 pin, the 4th short circuit cap J4 2 pin connection manual voltage regulation circuit in tertiary voltage Vo3, the first short circuit cap J1 2 pin Connect 5 pin of the first driving chip U1, the first voltage of the first short circuit cap J1 1 pin connection touching delay-action switch circuit The second voltage Vo2, the first driving chip U1 of Vo1, the first short circuit cap J1 3 pin connection self-maintained circuit 9 pin connect Connect double-point double-throw switch SW1 6 pin；10 grades of 2.5V~3.5V level indicating circuits include the second driving chip U2, second row type LEDU4, the tenth short circuit cap J10,3rd resistor R3, the 16th resistance R16, the 17th resistance R17, the 8th short circuit cap J8, the 1 of the second driving chip U2 Pin, 18 pin, 17 pin, 16 pin, 15 pin, 14 pin, 13 pin, 12 pin, 11 pin, 10 pin are successively respectively with the second row type LEDU4's 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 16 pin, 17 pin, 18 pin, 19 pin, 20 pin are connected, and 1 pin of the second row type LEDU4- 10 pin connect direct voltage source U5 positive pole respectively, and the negative pole of the direct voltage source U5 connects the second driving chip U2's 10 pin, 1 pin of the tenth short circuit cap J10 connect 11 pin of the second row type LEDU4,2 pin of the tenth short circuit cap J10 1 pin of the second driving chip U2 is connected, 6 pin of the second driving chip U2 connect the 16th resistance R16 first end, The first end of the 17th resistance R17 connects the first end of the 16th resistance R16, and the of the 17th resistance R17 Two ends are grounded, and 6 pin of the second driving chip U2 pass through the 16th resistance R16 and the 17th resistance R17 partial pressures 3.5V voltages are obtained afterwards, and 4 pin and 8 pin of the second driving chip U2 connect 6 pin of the first driving chip U1 respectively, described Second driving chip U2 2 pin ground connection, the 3 pin connection direct voltage source U5 of the second driving chip U2 positive pole, described the The 8th short circuit cap J8 1 pin, 2 pin of the 8th short circuit cap J8 are connected after two driving chip U2 7 pin series connection 3rd resistor R3 Ground connection, 5 pin of the second driving chip U2 connect the 4th short circuit cap J4 1 pin, the first short circuit cap J1 2 pin connection described the Two driving chip U2 5 pin, the 9 pin connection double-point double-throw switch SW1 of the second driving chip U2 3 pin, the double-pole are double Throw switch SW1 1 pin and 4 pin connect the positive pole of the direct voltage source U5 respectively, and 2 pin of the double-point double-throw switch SW1 connect 11 pin of the second driving chip U2 are connect, 5 pin of the double-point double-throw switch SW1 connect the 1 of the second driving chip U2 Pin.
- A kind of 2. 20 grades of level indicating circuits of multiple input sources according to claim 1, it is characterised in that：The first driving chip U1 and the second driving chip U2 choose LED display drivers LM3914.
- A kind of 3. 20 grades of level indicating circuits of multiple input sources according to claim 1, it is characterised in that：The resistance of the 4th resistance R4 is 10k Ω, and the resistance of the 5th resistance R5 is 10k Ω.
- A kind of 4. 20 grades of level indicating circuits of multiple input sources according to claim 1, it is characterised in that：The resistance of the 16th resistance R16 is 1k Ω, and the resistance of the 17th resistance R17 is 2.5k Ω.
- A kind of 5. 20 grades of level indicating circuits of multiple input sources according to claim 1, it is characterised in that：The touching delay-action switch circuit includes the first triode Q1, the second triode Q2, the 3rd triode Q3, the second direct current Potential source U6, the 3rd direct voltage source U7, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R11, the first electric capacity C1, the first diode D1, the second adjustable resistance RV2, the first triode Q1 base stage connect the 11st resistance R11 first end, the first triode Q1 colelctor electrode connect the 6th resistance R6 first end, and the first triode Q1 emitter stage connects The second adjustable resistance RV2 1 pin is connect, the second direct voltage source U6 positive pole connects the first triode Q1 colelctor electrode, and second is straight The negative pole for flowing voltage source U6 understands the first triode Q1 emitter stage, and the second triode Q2 base stage connects the first triode Q1's Emitter stage, the second triode Q2 colelctor electrode connect the 7th resistance R7 first end, the 7th resistance R7 the second end connection the 6th Resistance R6 the second end, the 3rd triode Q2 emitter stage connect the second adjustable resistance RV2 2 pin, the second adjustable resistance RV2's 3 pin are grounded, and the 3rd direct voltage source U7 positive pole connects the second triode Q2 colelctor electrode, the 3rd direct voltage source U7 negative pole The second triode Q2 emitter stage is connected, connects the second triode Q2's after the 3rd triode Q3 resistance R8 of base series the 8th Colelctor electrode, the 3rd triode Q3 emitter stage connect the first electric capacity C1 first end, the first electric capacity C1 the second end connection the 3rd Direct voltage source U7 positive pole, the 3rd triode Q3 colelctor electrode connection first voltage Vo1, the 9th resistance R9 first end connection First voltage Vo1, the 9th resistance R9 the second end ground connection, the tenth resistance R10 first end connection first voltage Vo1, the tenth electricity The second end for hindering R10 connects the first diode D1 positive pole, the first diode D1 negative pole ground connection.
- A kind of 6. 20 grades of level indicating circuits of multiple input sources according to claim 1, it is characterised in that：The self-maintained circuit includes the 4th triode Q4, the 5th triode Q5, the second electric capacity C2, the 3rd electric capacity C3, the tenth Two resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15, the 4th triode Q4 colelctor electrode connection 3rd electric capacity C3 the second end, the 4th triode Q4 grounded emitter, the 4th triode Q4 base stage connect the second electric capacity C2 First end, the second electric capacity C2 the second end connection second voltage Vo2, the 5th triode Q5 colelctor electrode connection second voltage Vo2, the 5th triode Q5 grounded emitter, the 5th triode Q5 base stage connect the 3rd electric capacity C3 first end, the 3rd electricity The second end for holding C3 connects the 12nd resistance R12 first end, and the 12nd resistance R12 second segment connects the 13rd resistance R13 First end, the 13rd resistance R13 the second end connects the 3rd electric capacity C3 first end, and the 14th resistance R14 first end connects The 13rd resistance R13 first end is connect, the 14th resistance R14 the second end connects the second electric capacity C2 first end, the 15th electricity The first end for hindering R15 connects the 13rd resistance R14 first end, and the 15th resistance R15 the second end connects the second electric capacity C2's Second end.
- A kind of 7. 20 grades of level indicating circuits of multiple input sources according to claim 1, it is characterised in that：1 pin that the manual voltage regulation circuit includes the first adjustable resistance RV1, the first adjustable resistance RV1 is grounded, and first is adjustable Resistance RV1 2 pin connection tertiary voltage Vo3.
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| CN201710942654.XA CN107561330B (en) | 2017-10-11 | 2017-10-11 | 20-level indicating circuit of multiple input sources |
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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 |
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| CN107561330B (en) | 2023-12-08 |
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