Power Amplifier Speaker Protection Circuit Diagram. Power amplifier speaker protection circuit schematic. If an auxiliary supply is used it needs to be around 12v to suit the relay coils.
Use the speaker protection circuit just connect the outputs of the amplifier to the inputs of the speaker protection circuit for both left and right channels. It has three wire power positive negative and ground. If an auxiliary supply is used it needs to be around 12v to suit the relay coils.
The speaker protection circuit requires an auxiliary voltage to be provided from a winding of the mains transformer the value of this voltage should be between 9v ac to 12v ac.
The drawing above shows how the circuit is wired into an amplifier. This current may damage the speaker especially in case of direct coupled amplifier. The output of the power amplifier connects to the speakers directly. While switching a power amplifier on a loud thump sound is heard to sudden heavy discharge current through the speaker at the time of power on.
