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.
This circuit can be used in alarms by activating a relay or a current load that depends on the...
The circuit given below was found in the National Semiconductor Linear Applications Handbook. The...
The current of this circuit is determined by a PNP transistor. The circuit is suggested by Texas...