CN209001921U - A kind of sound equipment power amplifier automatic shutdown circuitry - Google Patents
A kind of sound equipment power amplifier automatic shutdown circuitry Download PDFInfo
- Publication number
- CN209001921U CN209001921U CN201822065287.2U CN201822065287U CN209001921U CN 209001921 U CN209001921 U CN 209001921U CN 201822065287 U CN201822065287 U CN 201822065287U CN 209001921 U CN209001921 U CN 209001921U
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- China
- Prior art keywords
- resistance
- amplifier
- power supply
- diode
- capacitor
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Abstract
The utility model provides a kind of sound equipment power amplifier automatic shutdown circuitry, the automatic shutdown circuitry includes microphone in body, amplifying circuit, detecting circuit, voltage comparator and relay, pass through the sound output of lasting detection speaker, if continuous several minutes sound that can't detect speaker export, the circuit disconnects the power supply of sound equipment power amplifier automatically, the automatic shutdown for realizing sound equipment power amplifier plays the purpose for saving electric energy.
Description
Technical field
The utility model relates to a kind of auto-power-off energy-saving circuit, the power supply applied to sound equipment power amplifier controls, belongs to
In electronic technology field.
Background technique
In high fidelity sound system, the electric power of power amplifier is often larger, and many users often have and work on one side,
The habit for listening sound equipment on one side due to Job engagement, is usually forgotten to turn off sound equipment, leads to power when CD player has finished all songs
Amplifier is long charged standby, and electric resources is caused to waste.
Utility model content
To solve the above-mentioned problems, the utility model provides a kind of sound equipment power amplifier automatic shutdown circuitry, the electricity
Road the sound output of speaker is constantly detected, if the sound that can't detect speaker for continuous several minutes is defeated by built-in microphone in body
Out, which saves electric energy purpose to play for the automatic power supply for disconnecting power amplifier.
The specific technical solution that the utility model is taken is as follows:
A kind of sound equipment power amplifier automatic shutdown circuitry, the circuit include amplifier U1 and U2, the MIC1 of microphone in body, three poles
Pipe Q1 and Q2, diode D1~D4, resistance R1~R10, capacitor C1~C4, control port AC1~AC2, key K1 and relay
RL1, wherein the cathode of the MIC1 of microphone in body is grounded, one end of positive connecting resistance R1 and one end of capacitor C1, resistance R1's is another
Termination+5V power supply；The base stage of triode Q1 connects the other end of capacitor C1 and one end of resistance R3, emitter ground connection, and collector connects
The other end of resistance R3, one end of resistance R2 and capacitor C2 one end, another termination+5V power supply of resistance R2；Capacitor C2's is another
The cathode of one terminating diode D1 and the anode of diode D2, the cathode of diode D2 connect one end of capacitor C3, resistance R4 one
The normal phase input end at end, one end of key K1 and amplifier U1, the other end of capacitor C3 and the other end ground connection of resistance R4, key K1
Another termination+5V power supply；One end of the anti-phase input terminating resistor R5 of amplifier U1 and one end of resistance R6, two poles of output termination
The anode of pipe D3 and one end of resistance R7, another termination+5V power supply of resistance R5, the other end ground connection of resistance R6；Amplifier U2's
Normal phase input end connects one end of the cathode of diode D3, the other end of resistance R7 and capacitor C4, anti-phase input terminating resistor R8's
One end of one end and resistance R9 exports one end of terminating resistor R10, and another termination+5V power supply of resistance R8, capacitor C4's is another
The other end of end and resistance R9 are grounded；The other end of the base stage connecting resistance R10 of triode Q2, emitter ground connection, collector connect two
The anode of pole pipe D4 and one end of relay RL1 coil, the cathode of diode D4 and the other end of relay RL1 coil are all connected to
One group of normal open switch of+5V power supply, relay RL1 is connected to control port AC1 and AC2；Control port AC1 and AC2 are serially connected with sound
Ring the power circuit of power amplifier；Amplifier U1 and U2 use integrated transporting discharging LM358, and use+5V power supply power supply.
The utility model has the following beneficial effects: built-in microphone in body constantly detects the sound output of speaker, if consecutive numbers
Minute can't detect the sound output of speaker, which reaches by the automatic power supply for disconnecting power amplifier and save electric energy purpose.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
As shown in Figure 1, a kind of sound equipment power amplifier automatic shutdown circuitry, which includes amplifier U1 and U2, words in body
Cylinder MIC1, triode Q1 and Q2, diode D1~D4, resistance R1~R10, capacitor C1~C4, control port AC1~AC2, key
K1 and relay RL1, wherein the cathode of the MIC1 of microphone in body is grounded, one end of positive connecting resistance R1 and one end of capacitor C1, electricity
Hinder another termination+5V power supply of R1；The base stage of triode Q1 connects the other end of capacitor C1 and one end of resistance R3, and emitter connects
Ground, the other end of collector connecting resistance R3, one end of resistance R2 and capacitor C2 one end, another termination+5V power supply of resistance R2；
The cathode of another terminating diode D1 of capacitor C2 and the anode of diode D2, the cathode of diode D2 connect capacitor C3 one end,
The normal phase input end of one end of resistance R4, one end of key K1 and amplifier U1, the other end of capacitor C3 and the other end of resistance R4
Ground connection, another termination+5V power supply of key K1；One end of the anti-phase input terminating resistor R5 of amplifier U1 and one end of resistance R6,
Export anode and one end of resistance R7 of terminating diode D3, another termination+5V power supply of resistance R5, another termination of resistance R6
Ground；The normal phase input end of amplifier U2 connects one end of the cathode of diode D3, the other end of resistance R7 and capacitor C4, inverting input terminal
One end of connecting resistance R8 and one end of resistance R9 export one end of terminating resistor R10, another termination+5V power supply of resistance R8, electricity
Hold the other end of C4 and the other end ground connection of resistance R9；The other end of the base stage connecting resistance R10 of triode Q2, emitter ground connection,
Collector connects anode and one end of relay RL1 coil of diode D4, the cathode of diode D4 and relay RL1 coil it is another
One end is all connected to+5V power supply, and one group of normal open switch of relay RL1 is connected to control port AC1 and AC2；Control port AC1 and
AC2 is serially connected with the power circuit of sound equipment power amplifier；Amplifier U1 and U2 use amplifier LM358, and use+5V power supply power supply.
The MIC1 of microphone in body is responsible for detecting the sound that speaker issues, and triode Q1 is responsible for completing voltage amplification, capacitor C2, C3
Multiplication of voltage detecting circuit is formed with diode D1, D2, the AC audio voltage transformation that triode Q1 is sent out is at DC voltage.Amplifier
U1, resistance R5 and R6 form one group of voltage comparator, and amplifier U2, resistance R8 and R9 form another group of voltage comparator.
When needing out sound equipment power amplifier, high level is exported by one-touch K1, amplifier U1, the high level exported is logical
Diode D3 is crossed to capacitor C4 quick charge, so that the normal phase input end voltage of amplifier U2 is more than inverting input terminal voltage, amplifier
U2 exports high level, and the normal open switch of triode Q1 conducting, relay RL1 is closed, and the power circuit of sound equipment power amplifier connects
Logical, sound equipment power amplifier is started to work.When normal play music, the sound that speaker issues, detected through the MIC1 of microphone in body,
After triode Q1 amplification and multiplication of voltage detection, the normal phase input end voltage of amplifier U1 is more than inverting input terminal voltage, and amplifier U1 continues
High level is exported, amplifier U2 also continues to output high level, and triode Q1 maintains on state, the normal open switch dimension of relay RL1
Closed state is held, the power circuit of sound equipment power amplifier remains up.If discharging all songs, speaker voiceless sound is issued, times
Pressure detecting circuit output voltage is about 0V, and the normal phase input end voltage of amplifier U1 is lower than inverting input terminal voltage, amplifier U1 output
Low level, capacitor C4 slowly discharges through resistance R7, and after several minutes, the normal phase input end voltage of amplifier U2 is lower than inverting input terminal electricity
Pressure, amplifier U2 export low level, triode Q1 cut-off, and the normal open switch of relay RL1 flicks, the power supply of sound equipment power amplifier
Route disconnects, and realizes the automatic shutdown of sound equipment power amplifier.
Claims (1)
1. a kind of sound equipment power amplifier automatic shutdown circuitry, it is characterized in that: the circuit includes amplifier U1 and U2, microphone in body
MIC1, triode Q1 and Q2, diode D1~D4, resistance R1~R10, capacitor C1~C4, control port AC1~AC2, key K1
With relay RL1, wherein the cathode of the MIC1 of microphone in body is grounded, one end of positive connecting resistance R1 and one end of capacitor C1, resistance
Another termination+5V power supply of R1；The base stage of triode Q1 connects the other end of capacitor C1 and one end of resistance R3, and emitter is grounded,
The other end of collector connecting resistance R3, one end of resistance R2 and capacitor C2 one end, another termination+5V power supply of resistance R2；Electricity
Hold the cathode of another terminating diode D1 of C2 and the anode of diode D2, the cathode of diode D2 connects one end of capacitor C3, electricity
Hinder one end, one end of key K1 and the normal phase input end of amplifier U1 of R4, the other end of the other end of capacitor C3 and resistance R4 are all
Ground connection, another termination+5V power supply of key K1；One end of the anti-phase input terminating resistor R5 of amplifier U1 and one end of resistance R6,
Export anode and one end of resistance R7 of terminating diode D3, another termination+5V power supply of resistance R5, another termination of resistance R6
Ground；The normal phase input end of amplifier U2 connects one end of the cathode of diode D3, the other end of resistance R7 and capacitor C4, inverting input terminal
One end of connecting resistance R8 and one end of resistance R9 export one end of terminating resistor R10, another termination+5V power supply of resistance R8, electricity
The other end of the other end and resistance R9 that hold C4 is all grounded；The other end of the base stage connecting resistance R10 of triode Q2, emitter connect
Ground, collector connect anode and one end of relay RL1 coil of diode D4, the cathode and relay RL1 coil of diode D4
The other end be all connected to+5V power supply, one group of normal open switch of relay RL1 is connected to control port AC1 and AC2；Control port AC1
The power circuit of sound equipment power amplifier is serially connected with AC2；Amplifier U1 and U2 use integrated transporting discharging LM358, and use+5V power supply
Power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822065287.2U CN209001921U (en) | 2018-12-10 | 2018-12-10 | A kind of sound equipment power amplifier automatic shutdown circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822065287.2U CN209001921U (en) | 2018-12-10 | 2018-12-10 | A kind of sound equipment power amplifier automatic shutdown circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209001921U true CN209001921U (en) | 2019-06-18 |
Family
ID=66808604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822065287.2U Expired - Fee Related CN209001921U (en) | 2018-12-10 | 2018-12-10 | A kind of sound equipment power amplifier automatic shutdown circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209001921U (en) |
-
2018
- 2018-12-10 CN CN201822065287.2U patent/CN209001921U/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: 20190618 Termination date: 20191210 |