Two-channel speaker protection circuit diagram

The picture shows the speaker protection circuit. It is designed for left and right channels to work independently. In the figure (taking the left channel as an example), R2, C4, VT2, and VT3 form a power-on delay circuit to prevent large power-on current from impacting the speaker.

Component selection: LED can use Φ3mm high-brightness two-color light-emitting diodes. Since the operating current of LEDs varies, the parameters of R5 and R9 can be slightly adjusted. At the same time, the LED and current-limiting resistors R5 and R9 are connected in parallel at both ends of the relays RE1 and RE2, which can also suppress the reverse peak voltage and prevent breakdown of VT2, VT3, VT5, and VT6. It is best to use low leakage tantalum capacitors for C4 and C9.

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