Published:2009/6/25 21:19:00 Author:May | From:SeekIC
The device remains dormat (in an off con-dition) until some sound causes it to turn on. The input stage is a 741 operational amplifier connected as a noninverting follower audio amplifier. Gain is approximately 100. To increase gain raise the value of R2. The amplified signal is rectified and filtered to a dc level by R4. Then R5 is set to the audio level desired to activate the relay.
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/Relay_Control/SOUND_ACTIVATED_RELAY.html
Print this Page | Comments | Reading(3)
Code: