Speaker protection board circuit diagram – The circuit is very easy to build at home. simple and very effective speaker protection board for your stereo power amplifier board. The circuit contains three transistor which controls the circuit.
When any DC voltage detects on the circuit suddenly the circuit get off and protect your speaker from damaging the high DC current. In my opinion the speaker protection board is very essential for your power amplifier boards because you are playing the music in the higher volume the chances of damaging the speaker coil is high.
Working of Speaker protection Board
The speaker protection board working based on the transistors of c9013 and two 945 npn transistors, when any DC signals detect on the input of output the dc voltage passes through the 1N4007 diode and open the 945 transistor and the signal stores on the 100uf capacitor and delay the relay to turn on that time the relay disconnected the speaker from the amplifier and protect the amplifier ic and speaker.
Speaker protection PCB layout
Download PCB layout
I want 3 piece of this board. Please let me know how. Thanks
Nice