4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

Perforated tape reader (CB7417E)
Found in General Electric documentation from the 1980s, this high speed perforated tape reader...
Low voltage indicator (CB9550E)
This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the...
Digitally Controlled Sine Wave Generator (CB24568E)
We found this signal generator circuit in the November 1978 issue of Radio Electronics magazine. The...