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

Atari joystick to PC joystick adapter
Digital weight scale
Simple LF converter
Light Dark Sensor With Relay Circuit Using LM741
Stamp9G20
Simple Indicator for Dynamic Limiter Schematic Diagram
generating stripboard layouts
Tl5001 Pulse-width-modulation (pwm) Controller Coupled With A Tps2817 Mosfet Driver
Homebrewing
Detected distance with ultrasonic receiver circuit diagram
EPSON PHOTO 830U printer power circuit



Top