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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Sequential 4017 and Neon Lamp (CB10508E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
Partial Dimmer (CB7858E)
This circuit of a 1991 PE Hobbyst Handbook allows the brightness of the incandescent lamp to be...
Operational Amplifier Gain Tester (CB25096E)
This simple operational amplifier tester was published in the November 1987 issue of Radio...