This circuit produces the sound of a motorcycle or an outboard motor. The frequency is adjusted in the pot. For supplies above 9 V the BD136 must be equipped with a small heat sink.
This circuit was suggested by Siliconix in a 1980s publication. The circuit uses components from the time...
This circuit was found in a 1980s documentation. It is intended for remote vibration monitoring...
T We found this circuit in the 1960 Mullard transistor application manual. The circuit can be...