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9 V NiCd battery charger

Based on a Labs project | October 2011 | Find it here
9 V NiCd battery charger
The regulated power supply and four identical current sources shown in the diagram enable the simultaneous charging of four 9-volt NiCd batteries. The potential at the wiper of P1 determines to what voltage the batteries will be charged: an unusual, buteffective method.
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