Asymmetric bistable (CB21812E)

This circuit is from the 1960 Mullard transistor manual. The transistors are germanium from the time.

CMOS Proximity Sensor (CB10998E)
This circuit is from an April 2000 Poptronics. The magazine no longer exists, but the circuit can...
Volume limiter (CB27169E)
We found this circuit in the Radio Electronics Handbook magazine special edition of 1992. The...
Twisted Pair Transmitter for Resistive Transducer LM10 (CB14311E)
The integrated circuit used in this project is uncommon today, but the configuration can be...