Used with infrared remotes at the time, this circuit was found in a 1991 RE Experimenter Handbook. It may not work with the faster remotes control used today.
These two circuits were found in Radio Electronics magazine from February 1960. The transistor is a power...
This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon...
This small locator transmitter was found in old Radio Shack documentation. The transistor could be a...