This two-digit circuit was found in the 1999 Radio Experimenter Handbook. It uses the CA3161 and CA3162 A/D converter pair common at the time.
The coils of this circuit will determine the transmission frequency of this device. The circuit is from...
This project was described in Radio Electronics from December 1962. The circuit is based on a...
Found in a 90s General Electric documentation, this circuit has a drain current of just 1.5 uA....