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.
Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The...
This Dimmer circuit for incandescent lamps was found in an English documentation. The input...
This circuit was found in July 1986 Radio Electronics magazine. The maximum current is 1.5 A. The...