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L200 charger circuit

(Summer Circuits 2010 article)

This circuit came about as the result of an urgent need for a NiMH battery charger. No suitable dedicated IC being immediately to hand, the author pressed an L200 regulator and a 4.7 kOhm NTC thermistor into service. Those components were enough to form the basis of a charger with a cut-off condition based on cell temperature rise rather than relying on the more common negative delta-V detection.

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