Relay phase selector (CB9278E)

We found this circuit in a 1965 Electronic Design. The transistors are from the era, and modern equivalents can be tried out.

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Fake alarm (CB24990E)
The flashing LEDs in this circuit simulate a working alarm and can serve as a deterrent to a...
Oscillator (CB6000E)
This oscillator or clock generator generates rectangular signals and frequencies up to 100 kHz....
High Power Inverter (CB16531E)
The critical component of this project from a 1988 publication is the transformer. The final power...