Flip Flop with SCR (CB6534E)

Found on a Radio Electronics this 80's circuit uses two common SCRs driving lamps. This setting appears elsewhere in this site and this section.

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Optical receiver (CB8785E)
Found in a 90’s HAM Radio, this circuit is used for an optical communications system or even audio...
Bistable with two 555 (CB1294E)
This circuit appears in other articles in this section, but it is very interesting. It is a...
Symmetric Source (CB12274E)
Currents of a few tens of milliamps can be obtained with this simple source that makes use of an...