Analog to digital converter (CB20538E)

This TTL circuit for PC was found in an English documentation from 1992. The integrated circuit used ZN426E is not in common today.

18W Amplifier (CB1376E)
This amplifier is from a 1973’s Japanese magazine. The transistors are of the time and the power...
PUT with 2 Transistors (CB4216E)
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
1 to 10 mA Constant Current Sourcer (CB1198E )
In the figure we have the way to obtain an adjustable 1 to 10 mAconstant current source. The...