This TTL circuit uses LED indicators and must be powered by a voltage of 5 V. The capacitor determines the speed of the draw. We found it in documentation from the 90s.
a This very low voltage regulator supports input voltages from 1.7 V to 5.5 V and is suitable for IoT...
This transistorized circuit, with germanium transistors from the 60s, was obtained in a technical...
Found on an Elektor from the 90s, this TTL circuit generates a predetermined number of pulses with a...