This interesting circuit from Radio Elecronics from October 1965 shows a flip-flop or bistable with SCRs simulated by bipolar transistors.
This type of amplifier can be found in many other points in this section. This is from a 70s...
This is the simplest configuration of a voltage regulator with a zener diode. The resistor must be...
This small short-range FM transmitter was found in a 1987 documentation. It is intended for the...