Two-channel speaker protection schematic

Posted on Mar 28, 2007

As shown for the speaker protection circuitry. It is designed for the left and right channels operate independently. The figure (to the left channel as an example) of R2, C4 an

Two-channel speaker protection schematic
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d VT2, VT3 composition start delay circuit to prevent power current shock speaker. Component selection: LED high brightness can be used µ3mm two-color LED. Since the LED current big and small, R5, R9 parameters may be slightly adjusted. At the same time, LED and current limiting resistor R5, R9 because in parallel relay RE1, RE2 ends, but also restrain the anti-peak voltage to prevent breakdown VT2, VT3 and VT5, VT6. C4, C9 best selection of low-leakage tantalum capacitors.

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