Integrated signal generator appeared in Radio Electronics magazine in January 1968. The integrated circuits are from the time and the generator produces signals from 5 Hz to 50 kHz.
This circuit turns a relay on or off by touching the sensors or by connecting sensors at these...
This circuit is from a 90s Popular Electronics. It consists of a power source for bass amplifiers...
This circuit is from 1990 documentation. It uses a bridge with LEDs and the potentiometer must be...