Another simple DC protection

Posted on Feb 6, 2014

I used some schematics from Elliot sound products to help with this circuit. L-In and R-In come straight from the speaker terminals, +ve and -ve are +25 and -25 volts from the power supply. When the circuit detects DC, transistor 2 is turned on and the 25 volts is dropped across R4 and R5 to give 5 volts. This can then be used by the PIC multiprocessor.

Another simple DC protection
Click here to download the full size of the above Circuit.

There will be 2 x 12 volt relays with there coils in series fed from Rel+ and Rel-. These will be used to break the speaker output. Obviously, because a PIC is used here, any delay can be programmed into it and it can also flash the LED when the detection is sensed.

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