This transistor gain test was published in Radio Electronics magazine in July 1959. The transformer used is a special type common at the time. The circuit tests general-purpose transistors.
If mounted with SMD components, this spy transmitter for the FM range can fit into a pen. The...
The power supply for this circuit found in a QST magazine is given in the previous circuit. The...
This interesting Walk-talkie circuit for the FM band using a tunnel diode appeared in the Radio...