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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Astable with starting circuit (CB21099E)
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This circuit provides a pulse train of 4 MHz or at another frequency determined by the crystal during...
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This effect for guitar was found in an English magazine from 1978. The transistors can be the most...