This circuit is from an October 1980 Radio Electronics magazine. The circuit indicates when the maximum voltage range set by the LM3914 exceeds its end.
This circuit, from the 90's, is intended for operation with vinyl record players of the time, as...
This circuit, in fact, what it does is a reactivation of the batteries through a brief pulsating...
This circuit, for signals up to 1 MHz, is based on an RCA operational amplifier. The circuit was...