This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from December 1990.
This circuit uses two light-activated SCRs or LASCRs, uncommon components today. The power depends on...
We found this circuit in the July 1988 Radio Electronics magazine. The frequencies are given by...
This circuit was obtained from an ancient American documentation. The coil consists of 80 to 100...