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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Diac Light Pulse Generator (CB14687E)
We found this relaxation circuit with diac in an opto-electronic documentation with diac....
Dark activated alarm with hysteresis (CB7868E)
Found in American documentation from the 90s, this circuit can be implemented with modern...
SCR Trigger Circuit (CB16413E)
In the figure we have a very simple trigger circuit for an SCR that powers a 12 V lamp whose...