Speaker Protector Circuit

  
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 - schematic

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




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