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 dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of...
Found in a Radio Electronics from May 1964, this circuit activates a relay depending on the supply...
This circuit for RF measurements at 200 MHz was found in no documentation two years 80. At a...