This crystal tester was found on a 90s Ham Radio. Transistors are commonly used. The circuit is for testing crystals from 2 to 20 MHz.
January 2017 - Mouser Electronics already has to supply the INA240 evaluation modules for current...
Greater simplicity for a radio receiver than that achieved by the author of this project found in a...
This power control with SCR was found in Radio Electronics from April 1966. The components are...