The sound of drums can be obtained with these two touch-triggered double-T oscillators. The circuit is from a Radio Electronics Special projects from 1993.
This circuit was taken from the 1960's Mullard Transistor Manual. Information about the coils is...
This circuit was found in the PC documentation from 1996. The maximum current of the motor is...
This circuit is valid for the 240 V network but can be changed for other networks. Potentiometer can be...