Unijunction transistor sequential timer (CB21400E)

This circuit was found in Motorola documentation from 1968. Transistors can be modern equivalents, just like SCRs.

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DC to AC Converter (CB25843E)
This circuit with a few watts of power was found in the April 1995 issue of Electronics Now...
Serial Port Stepper Motor Control (CB15386E)
The circuit shown in the figure makes it possible to control a stepper motor via the serial port...
Super regenerative (CB23570E)
Suitable for the medium wave band with a loop antenna, this receiver was published in Radio...