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 L7805 is the SGS equivalent of the 7805. The circuit is from the SGS linear integrated circuit...
This circuit was found in a 1987 magazine. It measures monitors the heartbeat through electrodes. The...
This 4-function, high-pass, low-pass, band-pass and rejector filter was found in French...