CN212278498U - Be applied to breathing lamp of teaching is put to integrated fortune - Google Patents
Be applied to breathing lamp of teaching is put to integrated fortune Download PDFInfo
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- CN212278498U CN212278498U CN202021407840.7U CN202021407840U CN212278498U CN 212278498 U CN212278498 U CN 212278498U CN 202021407840 U CN202021407840 U CN 202021407840U CN 212278498 U CN212278498 U CN 212278498U
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- resistor
- operational amplifier
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- voltage
- breathing lamp
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Abstract
The utility model provides a be applied to breathing lamp of teaching is put to integrated fortune, put U1 and U2, electric capacity C1, resistance R1 ~ R7, diode D1 and emitting diode LED1 including fortune. The operational amplifier U1 constitutes a square wave oscillator for providing charge and discharge periodic signals, and the operational amplifier U2 constitutes a positive phase proportional amplifier for driving the light emitting diode LED1 after voltage amplification is completed. With this utility model be used for simulation electron technology course teaching, can mobilize the enthusiasm that the student participated in the experiment teaching, improve the teaching effect.
Description
Technical Field
The utility model relates to a be applied to breathing lamp of teaching is put to integrated fortune belongs to analog electron technical field.
Background
A square wave oscillator and a normal phase proportional amplifier formed by integrated operational amplifiers are generally applied to various circuits and are also the teaching key points of analog electronic technology courses. However, in the traditional teaching, the experiment of the square wave oscillator and the normal phase proportional amplifier is independently carried out, and the experiment is a verification experiment, so that the interestingness is lacked, the enthusiasm of students to participate is difficult to mobilize, and the teaching effect is low. The breathing lamp has better ornamental effect, and students are also better for the working principle. Therefore, the breathing lamp is provided with the square wave oscillator and the positive phase proportional amplifier which are formed by the integrated operational amplifier, and is used for simulating the course teaching of the electronic technology so as to arouse the enthusiasm of students for participating in experimental teaching and improve the teaching effect.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the concrete technical scheme who takes as follows:
a breathing lamp applied to integrated operational amplifier teaching comprises operational amplifiers U1 and U2, a capacitor C1, resistors R1-R7, a diode D1 and a light emitting diode LED1, wherein a positive phase input end of an operational amplifier U1 is connected with one end of a resistor R2 and one end of a resistor R3, a negative phase input end of the capacitor C1, one end of a resistor R4 and a positive phase input end of an operational amplifier U2, an output end of the operational amplifier U59is connected with the other end of a resistor R3 and the other end of a resistor R4, the other end of a resistor R2 is connected with one end of a resistor R1 and the positive electrode of a diode D1, the other end of the resistor R1 is connected with +5V, and the negative electrode of the diode D1 is grounded; the inverting input end of the operational amplifier U2 is connected with one end of a resistor R5 and one end of a resistor R6, the output end is connected with the other end of the resistor R6 and the anode of the LED1, the cathode of the LED is connected with one end of a resistor R7, and the other end of the resistor R5 and the other end of the resistor R7 are grounded; the operational amplifier U1 and U2 adopt LM358 operational amplifier and adopt +5V power supply.
The utility model provides a breathing lamp of constituteing is put by integrated fortune, contains square wave oscillator and normal phase proportional amplifier for simulation electron technology course teaching can move the enthusiasm that the student participated in the experiment teaching, improves the teaching effect.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, the breathing lamp applied to the integrated operational amplifier teaching comprises operational amplifiers U1 and U2, a capacitor C1, resistors R1-R7, a diode D1 and a light emitting diode LED1, wherein a positive phase input end of the operational amplifier U1 is connected with one end of a resistor R2 and one end of a resistor R3, a negative phase input end is connected with an anode of the capacitor C1, one end of the resistor R4 and a positive phase input end of the operational amplifier U2, an output end is connected with the other end of the resistor R3 and the other end of the resistor R4, the other end of the resistor R2 is connected with one end of a resistor R1 and an anode of the diode D1, the other end of the resistor R1 is connected with +5V, and a cathode of a diode D1 is grounded; the inverting input end of the operational amplifier U2 is connected with one end of a resistor R5 and one end of a resistor R6, the output end is connected with the other end of the resistor R6 and the anode of the LED1, the cathode of the LED is connected with one end of a resistor R7, and the other end of the resistor R5 and the other end of the resistor R7 are grounded.
The operational amplifiers U1 and U2 adopt LM358 operational amplifier, and under the +5V power supply condition, the output high level is about +4V, and the low level is about 0V.
The integrated operational amplifier U1 and peripheral elements thereof form a square wave oscillator, wherein a resistor R2 and a resistor R3 provide instant positive feedback; a resistor R4 and a capacitor C1 providing hysteresis negative feedback; the resistor R1 is connected in series with the diode D1, and the diode D1 provides about +0.7V voltage after being conducted, so that the voltage of the positive-phase input end of the operational amplifier is ensured to be more than 0, and the lower-wave oscillator can start oscillation normally under the condition of single power supply.
The operational amplifier U2 and the resistors R5 and R6 form a positive phase proportional amplifier, and the voltage amplification factor is 2 times. The output of the amplifier drives LED1, and since there is a dead band voltage of about 1.8V in the LED, LED1 will only light up when the output voltage of the amplifier exceeds 1.8V.
At the moment of power-on, because the capacitor C1 has no energy storage, the voltage of the inverting input end of the operational amplifier U1 is 0V, the voltage of the positive phase input end is greater than 0V, the voltage of the positive phase input end is higher than that of the inverting input end, the operational amplifier U1 outputs high level about +4V, and under the action of positive feedback, the voltage of the positive phase input end is raised to + 1.7V; when the operational amplifier U1 outputs a high level, the output high level charges a capacitor C1 through a resistor R4, the voltage of the capacitor C1 gradually increases, when the voltage of the capacitor C1 just exceeds +1.7V, the voltage of an inverting input end exceeds the voltage of a positive phase input end, the output of the operational amplifier U1 is inverted to be a low level of 0V, and the voltage of the positive phase input end synchronously decreases to be + 0.5V; when the operational amplifier outputs a low level, the capacitor C1 discharges through the resistor R4, the voltage of the capacitor C1 gradually drops, when the voltage of the capacitor C1 is just lower than +0.5V, the voltage of the positive phase input end is higher than that of the reverse phase input end, the output of the operational amplifier U1 is inverted to a high level, and the voltage of the positive phase input end rises to + 1.7V. By repeating the above steps, the square wave oscillator formed by the operational amplifier U1 starts to oscillate, the output end can continuously output square waves, the inverting end can continuously obtain charge and discharge voltages, and the oscillation frequency can be adjusted by adjusting the parameters of the capacitor C1 or the resistor R4.
The charge and discharge voltage of the inverting terminal of the operational amplifier U1, the lowest voltage +0.5V and the highest voltage +1.7V, are amplified by 2 times through a positive phase proportional amplifier composed of the operational amplifier U2, the lowest voltage output by the operational amplifier U2 is +1V and the highest voltage is + 3.4V.
When the capacitor C1 is charged, when the output voltage of the operational amplifier U2 reaches about +1.8V, the light-emitting diode D1 starts to be slightly bright, and as the output voltage continues to rise, the light-emitting diode D1 emits light and gradually brightens, and when the output voltage rises to the top, the light-emitting brightness of the light-emitting diode D1 also reaches the strongest; when the capacitor C1 discharges, the light emitting diode D1 brightness is gradually reduced, when the output voltage of the operational amplifier U2 is low to about +1.8V, the light emitting diode D1 is turned off. Thus, the light emitting diode D1 lights gradually, then lights gradually, stops lighting, and repeats to form the breathing lamp effect.
Claims (1)
1. The utility model provides a be applied to breathing lamp of teaching is put to integrated fortune, characterized by: the breathing lamp comprises operational amplifiers U1 and U2, a capacitor C1, resistors R1-R7, a diode D1 and a light emitting diode LED1, wherein a positive phase input end of the operational amplifier U1 is connected with one end of a resistor R2 and one end of a resistor R3, a negative phase input end of the operational amplifier U1 is connected with an anode of the capacitor C1, one end of a resistor R4 and a positive phase input end of the operational amplifier U2, an output end of the operational amplifier U39 3 and the other end of the resistor R4, the other end of the resistor R2 is connected with one end of a resistor R1 and an anode of the diode D1, the other end of the resistor R1 is connected with +5V, and a cathode of the diode D; the inverting input end of the operational amplifier U2 is connected with one end of a resistor R5 and one end of a resistor R6, the output end is connected with the other end of the resistor R6 and the anode of the LED1, the cathode of the LED is connected with one end of a resistor R7, and the other end of the resistor R5 and the other end of the resistor R7 are grounded; the operational amplifier U1 and U2 adopt LM358 operational amplifier and adopt +5V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021407840.7U CN212278498U (en) | 2020-07-15 | 2020-07-15 | Be applied to breathing lamp of teaching is put to integrated fortune |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021407840.7U CN212278498U (en) | 2020-07-15 | 2020-07-15 | Be applied to breathing lamp of teaching is put to integrated fortune |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212278498U true CN212278498U (en) | 2021-01-01 |
Family
ID=73898630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021407840.7U Expired - Fee Related CN212278498U (en) | 2020-07-15 | 2020-07-15 | Be applied to breathing lamp of teaching is put to integrated fortune |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212278498U (en) |
-
2020
- 2020-07-15 CN CN202021407840.7U patent/CN212278498U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210101 Termination date: 20210715 |