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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Metal Detector (CB15795E)
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Random neon lamps (CB7236E)
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
Stereo Balance Indicator (CB16346E)
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