We found this circuit in a 1963 Radio Electronics. It can be used for remote control. The frequency depends on the coil and the power is supplied by a single battery.
This simple transistorized receiver with earphone was found in a Japanese publication from the...
This circuit was obtained from an English publication in 1979 but can be easily assembled with...
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...