This circuit produces the sound of percussion such as blocks, drum, bell, etc. The frequency depends on the marked capacitors, which can have a wide range of values depending on the desired sound.
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...
This circuit makes simultaneous control of two up to 150 W incandescent lamps. The circuit is half wave...
This circuit uses an integrated CMOS having the frequency determined by the resistors and...