We found this transistorized circuit in a 1985 documentation. The circuit can operate with voltages from 9 to 12 V and the adjustment of the operating point or input sensitivity is done in P1.
Indicated at the time of publication as a “walk man” for MW radios, this circuit is simple and can...
A configuration using three of the four voltage comparators on the LM339 is shown in the figure and...
Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in...