This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V and other frequencies can be generated with capacitor replacement.
Instead of LED bulbs, LEDs with a series 470 ohm 1k resistor can be used in this 80's circuit....
This circuit was obtained in an American publication of 1977. The circuit generates rectangular...
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...