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Speaker protection circuit

2016-09-12 01:04  
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Speaker protection circuit
The speaker protection circuit is shown in the figure. It has the left and right channels to work independently. In the Figure ( left channel ), R2 , C4, VT2 and VT3 form a starting up delay circuit to prevent the starting up high-current impact on speaker. Components Selection: LED can choose Φ3mm high-brightness color LED. Since LED current may be high or low, the parameters of R5, R9 can be slightly adjusted. At the same time, the LED and the current limit resistors R5, R9 are connected to two ends of relays RE1 and RE2 in parallel to inhibit the anti-peak voltage and prevent the breakdown from VT2, VT3, VT5 and VT6. C4, C9 should use low-leakage tantalum capacitors. Other components parameters are shown in the figure.