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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Nuclear Radiation Detector (CB12599E)
This circuit uses a large surface diode to detect radiation (alpha and beta particles, in addition to...
Phonographic preamplifier (CB12883E)
This preamplifier for the phonographic capsule was obtained in an Argentine publication from 1973....
Zero Crossing Detector (CB12450E)
This circuit is from a 1993 publication and can be implemented with any optical isolator that has...