We found this circuit in documentation from the 1980s. The transformer is of the low voltage type with a 1: 3 turn ratio and the transistors can be of general-purpose types.
Found in an 80's Elektor, this circuit can control loads up to 750 mA with the BD139 and 100 mA...
This circuit generates a frequency modulated tone with excellent power. Other power MOSFETs can be...
The figure shows how to connect a 7400 to obtain a bistable configuration. The circuit must be...