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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Microwave Leak Test (CB17442E)
With this circuit, a common multimeter can be used to check if there is a microwave leak in a...
Half Wave Fast Rectifier (CB5160E)
This 80's circuit can be made with current comparators. Rectification accuracy is 1% DC up to 100...
1Hz to 300kHz Frequency meter (CB16429E)
This frequency meter, found in a 1987 documentation, uses indicator LEDs and can work with audio...