Sequential Arrow (CB6377E)

We found this circuit in an Electronics World of 1967. The components are of the time and incandescent lamps are used.

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Parallel Port Interface (CB25730E)
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...
SCR Simulated Photo Relay (CB14637E)
This circuit uses two transistors to simulate the action of an SCR on a regenerative switch....
High Q Notch Filter (CB14424E)
The filter presented is from 1994 but can be implemented with a more modern equivalent. We found...