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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Voltage Controlled Current Regulator I (CB19943E)
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Multiple Alarm (CB20628E)
We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps....
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This type of circuit, found in American documentation from the 1980s, triggers producing output...