The loudspeaker protection circuit

Published:2011/6/10 2:33:00 Author:qqtang | Keyword: protection circuit | From:SeekIC

In the figure is the loudspeaker protection circuit. The circuit is designed to have the left and right channels and they work separately.Elements selection: the LED can be the Φ3mm high brightness dual color LED. As the working current can be large or small. The parameters of R5 and R9 and be slightly adjusted. At the same time, LED and current limiting resistors R5 and R9 are connected with the two terminals of the relays (RE1 and RE2), so the inverting peak voltage can be impeded and VT2, VT3, VT5 and VT6 won't be broken down. It is better to choose low-leakage Tantalum capacitors for C4 and C9. The parameters of other elements are shown in Figure 1.



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