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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Turns Counter (CB18037E)
This is a project that can easily be adapted for other purposes such as counting people, objects,...
Receiver For Modulated Light (CB10672E)
This circuit is from a PopularElectronics of June 1992. The magazine no longer exists, but the...
Spring Line Delayed Reverb (CB5969E)
This circuit makes use of a mechanical delay line to produce the reverberation effect. This is a...