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Simple NiCad Battery Charger Circuit

2015-01-09 09:10  
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This circuit is a simplenicad battery charger. Thenicad battery chargervoltage across the pair of 1N4148 diodes biases the base of the  BD140  medium power transistor. this suits most 1.5V and 9V rechargeable batteries. The transformer should have a secondary rating of 12V ac at 0.5amp, the primary should be 220/240volts for Europe or 120volts ac for North America. he base-emitter voltage of the transistor and the forward voltage drop across the diodes are relatively stable. Thenicad battery chargercurrent is approximately 15mA or 45mA with the switch closed. Here is a schematic nicad Battery charger:


Simple NiCad Battery Charger Circuit 400x237 Simple NiCad Battery Charger Circuit

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