Clocked Flip Flop 7400 (CB22413E)

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

Varicap Variable Frequency Oscillator (CB13124E)
The great advantage of the circuit shown in the figure is the fact that its frequency is...
12 V x 1 A Power Supply (CB1172E)
This power supply provides a12 V stabilized output. The transistor must be provided with a good...
Control for miniature railways (CB7079E)
Found in an American publication from 1968, this circuit can be made based on a TIP42 that must be...