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The amplifier tube protector circuit

2016-09-27 18:57  
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The amplifier tube protector circuit
In the Figure, K is a power switch, T1 is the controlling small power transformer, T2 is the amplifier power transformer. IC1 (S1-S4) is the four - way analog switch CD4066. When the machine is open, K1 is closed, C1 gets 12V DC voltage. The S3 gets conduction because control terminal is high, then S4 control terminal is pulled low, S4 disconnects. C2 voltage can not get mutation, so S1 gets conduction when machines is open due to the control terminal is in high level, and optocoupler IC2 LED is lit.