Asymmetric bistable (CB21812E)

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

Serial Driver RS232S (CB17022E)
If you are on an old PC that you use for experiments, control or other applications, this circuit is...
Bicolour LED Driver (CB13576E)
We found this circuit in an American publication from 1977. The circuit drives two LEDs according to...
4 W amplifier with MFC4050 (CB20024E)
In this circuit, the integrated amplifier used is uncommon today. The circuit is from an American...