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.
The circuit that we will see below uses an element of the semiconductor family that is not yet...
This circuit with silicon transistors at the time was found in the Radio Electronics magazine of...
This low current circuit is suitable for powering the previous circuit and other strobe lamp...