This speaker overload protection circuit was found in Radio Electronics from the 1980s. The circuit uses a 9 V relay but can be powered by 12 V for a relay of this voltage.
This one-channel circuit was found in a 90s Popular Electronics, functioning as a vox. Components...
Two operational amplifiers 741 are used in this circuit that must be powered by a symmetrical...
We found this circuit in the October 1978 issue of Radio Electronics magazine. The magazine...