This Hall effect sensor circuit was found in the July 1998 issue of Electronics Now magazine. It is suitable for experiments with magnets in laboratories and schools.
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...