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LOUDSPEAKER_PROTECTOR

2016-09-17 10:55  
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LOUDSPEAKER_PROTECTOR
Transistors Q1, Q2, and Q3 monitor the two outputs of the stereo amplifier. If the offsets exceed ±2 V, Q7 is turned off, which turns off Q8 and the normally on relay. Diodes D2 and D5, together vith Q4, provide a mains voltage monitor. As soon as the ac input voltage disappears, as when the ampli-fier is turned off, Q4 turns off and Q5 turns on. This turns off Q7, Q8, and the relay. Hence, the loud-speakers are disconnected immediately after the amplifier is turned off.