Found in a 1967 EEE, this circuit generates a constant amplitude signal, stabilized by a zener diode. The circuit can operate with voltages from 18 to 22 V.
This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time....
I found this circuit in an Electronics Handbook from 1989. The circuit can be assembled with a...
This circuit makes use of a 2N301 germanium power transistor. We found it in a documentation from...