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.





Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    230 Volt AC To Inverter SwitchingCircuit
    Discrete Robot
    Mobile Bug Detector
    3 Band Graphic Equalizer
    AD594 to a 597 basic application circuit
    Series DC power supply
    Line current measurement circuit
    FM Micro-Transmitter Bug Surveillance Circuit



    Top