Loudspeaker Protector Circuit


Posted on Oct 31, 2012

Transistors Ql, Q2, and Q3 monitor the two outputs of the stereo amplifier. If the offsets exceed 2 V, Q7 is turned off, which turns off Q8 and the normally on relay. Diodes D2 and D5, together with Q4, provide a mains voltage monitor. As soon as the ac input voltage disappears, as when the amplifier is turned off, Q4 turns off arid Q5 turns on. This turns off Q7, Q8, and the relay.


Loudspeaker Protector Circuit
Click here to download the full size of the above Circuit.

Hence, the loudspeakers axe disconnected immediately after the amplifier is turned off.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

DC 2 speed Motor Controller
Electronic potentiometer schematic
Mosfet 75W Power Amplifier
active loudness circuit schematic
simple touch switch circuit
Time Domain Reflectometer (TDR)
Application Of Uart In Gps Navigation System
pulse induction metal detector with DSP
Normally closed contact burglar alarm circuit diagram
Voice-activated toy car circuit



Top