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Speaker Protector Circuit

2016-09-10 16:02  
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Most of the transistors in this speaker protector function as switches. Normally, Q4, Q5, and K1 are on and the speakers are connected to the amplifier. However, if a large dc voltage appears at an amplifier output, either Q3, or Ql and Q2 turn on, biasing Q4 off. That action turns Q5 off, de-energizes the relay, and disconnects the speakers from the amplifier.
Speaker Protector Circuit

Components Dl, D2, and Q6 form the overdrive-protection circuit.

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