Half-wave power control (CB20715E)

The trigger element of this circuit is a neon lamp. The SCR admits an equivalent. We found it in an American documentation from the 80s.

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Electronic Bingo (CB17441E)
This 2001 CMOS digital circuit draws numbers from 00 to 99 and can be expanded. However, it does...
12 V x 1 A Power Supply (CB8682E)
Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be...
Cascading in 4027 (CB154E)
Figure bellow shows how n 4027 can be cascaded to form a divide-by-2. The maximum input frequency...