This transmitter for the 3.5 and 7 MHz ham radio was found in a 1950s Japan publication. No information was given on the coils and the power supply.
This circuit was obtained in a 1982 English magazine. It is a regulator for outputs between 1 and...
Touching the sensor with your fingers, this circuit produces a machine gun sound. The circuit must...
This sensor was published in Radio Electronics magazine in April 1962. The two-transistor circuit...