Circuit diagrams and schematics - Electronic projects

Feautures: * automatic switch on on rear gear * led-bargraph display * audible bleep on last led * “good old” design style, no microcontrollers! This was one of my first designs: it is an ultrasonic parking sonar. Based on an ultrasonic amplifier from an article seen on a 1982 magazine, it was once installed on [...]

This is a simple circuit for an electronic switch – I’d designed this for an external footswitch module but also with a duplicate button panel mounted. There are enough gates spare to easily make a dual version. Output – 0v to +V Gate (switchable Mom or Tog), plus trigger signal (c. 1ms pulse) each time [...]

This circuit uses bog standard parts, without requiring a magical “do-it-all” IC. You can make an ultra simple 1.5v to 9v regulated stepup converter by using a TL496 IC, a coil and a capacitor, but that’s not so much fun if you want to experiment. I’ve already built a TL496 based circuit so I started [...]