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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2000 V low current source (CB9445E)
Found in a 90s Radio Electronics, this circuit can be used in high voltage experiments, ionizers,...
Variable Frequency Oscillator (CB22465E)
This VFO circuit generates signals from 2 Hz to 50 Hz. We found it in Popular Electronics from...
Absolute Value Amplifier (CB8997E)
This circuit, published in the 1980s, can be applied to operational amplifiers of almost any type....