This circuit uses components that are still common despite being from 1995 documentation. The circuit can be powered by 6 to 12 V voltages and the speed of the LEDs' sliding effect is set to P1.
This 1970 Philips circuit uses a mechanical counter. The circuit is triggered by a reed switch...
Found in old documentation about neon lamps, this circuit shows how to add a simple blown fuse...
This fuzz uses only one transistor that can be the BC548. Signal input and output cables must be...