Asymmetric bistable (CB21812E)

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

Bistable Sonic Relay (CB18272E)
With the configuration shown in the figure, we have the relay being activated when the microphone picks...
Pulse Generator (CB18236E)
This TTL generator that can function as a control shield or external clock for microcontrollers was found in...
Absolute Value Circuit (CB19719E)
The OP07 operational amplifier is not common today, as the circuit is from an old European manual....