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Amplifier tube protector circuit

2016-09-22 10:03  
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Amplifier tube protector circuit
The amplifier tube protector circuit is as shown in the figure. Working principle: K is the power supply switch, T1 is the small control power transformer, T2 is the amplifier power transformer. The IC1(S1-S4) is the four-way analog switch CD4066. When the circuit is booting, you need to close K1, so the C1 gets the 12V DC current. At this time the S3 conducts because the control port has the high electrical level, if you make the control port of S4 to have the low electrical level, the S4 will cut off. The voltage of C2 can not be changed, so the S1 conducts because of the control port has the high electrical level, the optocoupler IC2's LED turns on, the photodiode conducts to make the amplifier volume potentiometer's output audio signal shorted to ground. After the S1 is conducted, C3 charges for few tenths second, the S2 conducts, then the VT conduct, the relay J closes to connect the amplifier power supply.