Other versions exist on this site from various publications. This one is from the Radio Electronics Experimenter from 1990. The bargraph circuit uses the UAA170.
This Phase-Shift Oscillator produces sine low frequency signals suitable for many applications. It...
This circuit is from an 80's technical newsletter. The circuit can use any general purpose...
This circuit is from American documentation from the 1980s. The circuit can make use of any common...