NICKEL_CADMIUM_CELL_CHARGER

Published:2009/6/29 20:43:00 Author:May | From:SeekIC

Charges four size D cells in series at constant current, with automatic voltage limiting. BC301 transistor acts as current source, with base voltage stabilized at about 3 V by two LEDs that also serve to indicate charge condition. Other transistor provides voltage limiting when voltage across cekks approaches that of 1k branch of voltage divider. Values shown give 260-mA charge initially, dropping to 200 mA when VC reaches 5V and decreasing almost to 0 when VCreaches 6.5 V.-N.H. Sabah, Battery Charger, Wireless World, Nov. 1975, p 520.



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