This circuit detects when an audio signal exceeds a certain level or even occurs due to an object falling, a door slamming or other. The circuit is from a Radio Electronics from January 1980.
Using the LM380, this circuit provides a power of the order of 200 mW. In it we have a stage of...
I found this circuit in an article in a 2003 publication. The circuit is an example of how to...
We found this circuit in a Radio Electronics from October 1965. The pickup coil can be of the...