Asymmetric bistable (CB21812E)

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

Fast logarithmic converter (CB9613E)
Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next...
Doorphone and Doorbell (CB18111E)
Although quite simple, the usefulness of this circuit is great. It can even mean gains for those...
Direct Read Inductance Meter (CB12437E)
This circuit converts inductances on two scales into voltages. The circuit was obtained from a...