This circuit was found in a General Electric documentation from 1970. Equivalent transistors can be used. The maximum signal frequency for the indicated components is 250 kHz.
This light effect circuit was found in the July 1971 Radio Electronics magazine. The circuit is...
This is the traditional configuration of an AND gate using an operational amplifier. Operational...
This is the receiver for the previous circuit, also found in 90s Radio Electronics. The circuit...