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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Differential Amplifier (CB6546E)
This circuit was found in an American publication from 1968. The transistors are from the time,...
Low Impedance Microphone Preamplifier III (CB963E)
The components of this circuit are exchanged for modern equivalent such as 470 K for the pot and...
Basic Voltmeter (CB391E)
This circuits shows how to use in operational amplifier as a basic voltmeter. Power supply must be...