Clocked Flip Flop 7400 (CB22413E)

This TTL circuit uses 5 NAND gates of 7400 integrated circuits. It must be powered with 5 V.

Micro Amplifier H531 (CB18398E)
This circuit uses a magnetic phone containing 3 germanium transistors. This is a Japanese...
Nicad Battery Charger (CB17556E)
This is a simple circuit that we found in a 2001 documentation. The integrated circuit must be...
Crystal triple oscillator (CB8061E)
This frequency triple oscillator circuit was found in an American publication in 1967. The FET is...