Manual Clock 7400 (CB22411E)

This circuit to produce clock pulses is manually driven. The circuit is TTL and must be powered by 5 V.

Sensor with photo IC (CB24137E)
Based on an integrated circuit CA31062 which consists of a photosensor, this circuit was obtained from...
Sound Intensity Meter (CB11533E)
This ultra-simple meter uses an output transformer and a small speaker as a microphone. The...
Oscillator up to 50 MHz (CB23739E)
The frequency of this oscillator depends on the crystal used and the transistors. The circuit was...