Activance Pipe Protector Circuit ----- Amplifier Protection Circuit

Power amplifier protector circuit The circuit is shown as a power amplifier protector circuit. Working principle: The k is the power switch, T1 control Small power transformer, T2 is a power amplifier power transformer. IC1 (S1-S4) is a four-way analog switch CD4066. When starting, the 12V DC voltage is obtained on the K1 and C1. At this time, S3 is turned on due to a high level of the control terminal, and the S4 control terminal is placed at a low level, and S4 is disconnected. Since the voltage on the C2 cannot be mutated, S1 is turned on due to the high level of the control terminal, and the photocoupler IC2 is lit, the photosensitive tube is turned on, and the active amplifier volume potentiometer outputs the audio signal short circuit to the ground . After the S1 is turned on, C3 is charged. After a few seconds of zero, S2 is turned on, then the VT is turned on, the relay J is bonded, and the power amplifier is partially powered. The VD7 is fed back to the control terminal after the S2 is turned on, so that the S2 is self-locking. After that, C2 is charged, and the S1 control end potential is gradually reduced. Since the COMS analog switch has a conduction resistance with the characteristic of the control terminal potential gradient, as C2 charges, the light-emitting diode in the IC2 is frustrated, the electrical resistance of the photosensitive tube is getting bigger, and if the active volume potentiometer is at a large opening degree, then The performance is gradually increased to prevent boot impact. Finally IC2 is closed, RP can freely control the volume. When shutting down, the charge is turned off on the C1 to be removed by R1 and the LED LED. C5, C6 due to large capacity, the voltage still exists, so VD5, VD6 is closed, IC1, IC2 does not stop working immediately, and J is still happening. At this time, S3 is broken due to the low level of the control terminal, and C4 starts charging. As the S4 control end potential gradually rises, the conductive resistance is tapped, and the electrical resistance presented by the optical sensitizer in IC2 is becoming less, and the active amplifier volume is gradually cleared. Later, since the discharge of C5, J release, power amplifier is powered. Component Selection: LED Select φ5mm Red Luminescent Diodes. IC2 Select the 4N25 photocoupler. Other components are shown in the figure.

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