This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
This project was found in a 1982 publication. It is a small transmitter that can send signals from...
This sewing machine motor control was found in the December 1997 Electronics Now magazine. The...
This circuit, from a 1987 documentation, is for the CB3817E transmitter. Connected to the handset...