This TV remote control receiver uses a ratchet system to activate an old drum-type selector to change channels. A common system at the time. The circuit is from a Radio Electronics from February 1961.
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
Found in documentation from the 1980s, this circuit uses an operational amplifier from that time....
This circuit allows the detection of RF signals using the lowest range of direct currents of a...