Optical isolator (CB9165E)

This circuit was found on an old EDN and can be used as a shield. Optical couplers are from the era and modern equivalents can be used.

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Basic Latch 2 (CB7982E)
What sets this circuit apart from the previous one is the use of only one push button. The circuit...
Frequency Selector 741 (CB16232E)
The filter shown in the figure, using only an operational amplifier, is characterized by allowing 1...
Incandescent Dimmer (CB11373E)
This circuit controls the brightness of incandescent lamps up to 400 W for the TIC226 series...