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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4-Digit Digital Multimeter (CB24735E)
We found this circuit in the February 1983 issue of Radio Electronics magazine. The 4-digit...
Voltage Controlled Resistor (CB5347E)
We found this circuit in an old American documentation. It is an electronic rheostat with a...
Curve Plotter (CB18787E)
With this circuit it is possible to trace the characteristic curve of a component using an...