Null Detector (CB6496E)

Found in a Philips documentation from 1968, this circuit detects the trimpot set input voltage. The operational can be of almost any kind.

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Electronic Compass (CB25382E)
This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two...
DC to AC Power Inverter (CB19919E)
The MOSFETs are of the type of power and the resistors have their values between 1 k and 10 k for...
Increasing zener voltage with LED (CB22134E)
In the figure we have the way to use an LED to increase the voltage of a zener. The increase...