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 activates a relay with a delay that can be adjusted in a range of values that depends on...
EZP-Q metallized polypropylene capacitors from Panasonic's can be purchased from Mouser...
This circuit was found in a 1964 Electronic Design. The components are of the time, and modern...