Voltage reference (CB8466E)

Found in a 90s General Electric documentation, this circuit has a drain current of just 1.5 uA. The load current is 200 uA.

Decade Counter with Nixie Tube (CB20141E)
This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time....
Water Level Alarm (CB12215E)
I found this circuit in an Electronics Handbook from 1989. The circuit can be assembled with a...
Audio Booster (CB22489E)
This circuit makes use of a 2N301 germanium power transistor. We found it in a documentation from...