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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OR gate LM3900 (CB14200E)
We found this setting in the National Semiconductor Linear Applications Handbook. The base is an...
Transistor Flip-Flop (CB19897E)
This conventional flip-flop configuration with two transistors was found in documentation from the...
Flame Detector (CB17547E)
This circuit is intended to monitor the flame of gas heating systems that must always have a small...