Recording and playback circuit with ISD1000A (CB7441E)

Found in an Electronics Now from the 90s, this application uses an integrated circuit from the hard times to find today.

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Null Detector (CB6496E)
Found in a Philips documentation from 1968, this circuit detects the trimpot set input voltage....
Power Stage for Alarms (CB12353E)
This circuit can be connected to the output of alarms or sirens with the 555, CMOS or TTL,...
Sound Capacitor Meter (CB17657E)
This simple capacitor tester, already covered in other articles in this section and on the...