Powerful IR Emitter (CB26030E)

This modulated circuit was found in the November 1997 Electronics Now magazine. The power transistor can be any MOSFET,

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Light Activated OR Gate 1 (CB5319E)
This circuit uses two light-activated SCRs or LASCRs, uncommon components today. The power depends on...
Bistable with Two Neon Bulbs (CB10506E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
OR Function with the LM3900 (CB4507E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...