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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High Voltage Source (inverter) (CB13071E)
Small inverters can help to obtain high voltages from batteries. Although the switched inverters that...
Binary Watch (CB18155E)
It is an ideal assembly to be implemented as work by students of digital electronics courses, as...
LED Strobe (CB22126E)
In this very simple circuit, the LED flashes at a frequency of 60 Hz. It is convenient to check the...