This circuit for multiple sound inputs was found in a Radio Electronics from January 1992. It consists of a Bargraph connected to a multi-input mixer.
This circuit allows selective relay actuation in the same line according to the applied voltage....
The circuit in the figure is suggested by Linear Technologies (www.linear.com) and consists of a...
Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of...