Battery Charge Indicator (CB26002E)

This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.

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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...