TTL Counter (CB21360E)

This counter from 0 to 9999 was found in English documentation. The power source must be 5V with at least 1A.

Symmetric power supply for operationals (CB22161E)
Found in an English documentation from 1989, this font uses current components. Rectifier bridges can...
Current sensor with 100 M ohm input (CB9663E)
This sensor circuit for currents of the order of nanoamperes was found in an American...
Sequential Flasher (CB24674E)
This TTL sequential flasher circuit was found in the January 1981 issue of Radio Electronics...