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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Relay Drive with Strobe (CB14050E)
This circuit was found in a 1972 RCA documentation. The transistor supports an equivalent as the...
Multivibrator Lock Out Input LM139 (CB14239E)
The circuit shown below was obtained from the National Semiconductor Linear Applications Handbook...
Grid dip meter (CB7486E)
Found in a 1960 Sylvania transistor manual, this circuit can be implemented with modern...