Showing posts with label nicad. Show all posts
Showing posts with label nicad. Show all posts
Friday, December 12, 2014
Battery Charger for NiCad Batt
This battery charger circuit is designed for recharging NiCad batteries based on an AC-powered current source method.It can crank out as much as 1 amp and can be modified to go even higher by choosing different devices for Q1. Since this circuit uses AC line voltages and currents, please exercise extreme caution during assembly, turn-on, and test.
Thursday, August 21, 2014
NiCad Battery Charger
This simple and low cost battery charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. The base-emitter voltage of the transistor and the forward voltage drop across the diodes are relatively stable. The charging current is approximately 15mA or 45mA with the switch closed. This suits most 1.5V and 9V rechargeable batteries.
The transformer should have a secondary rating of 12V ac at 0.5amp
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