Collector triggered bistable (CB21839E)

This circuit is from a 1974 Ferranti transistor manual. Transistors are general-purpose types at the time. The maximum switching rate is 100 kHz.

Thought Recorder ISD1000A (CB25688E)
The circuit shown was found in the February 1994 issue of Electronics Now magazine. The circuit...
Microamplifier (CB25155E)
Suitable for clandestine listening and in SMD assembly, this circuit was found in the Radio...
Common Mode High Reject Video Amplifier (CB9419E)
Found in a 90's EDN, this circuit has a 45 dB common mode rejection. The pass band is 60 MHz. The...