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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Modulated Light Receiver (CB6160E)
This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and...
Triac and 555 (CB12110E)
This circuit is from an Italian magazine Elettronica 2000 of September 1987. It is a pulsator for...
Bicycle Speedometer (CB24536E)
Published in a February 1978 Radio Electronics magazine article, this digital circuit uses some of...