NICAD_CHARGER

Published:2009/6/29 21:21:00 Author:May | From:SeekIC

Switch gives choice of two constant-current charge rates. With 10 ohmsfor R1, rate is 60 mA, while 200 ohms for R2 gives 3 mA. Silicon diodes CR1 and CR2 have combined voltage drop of 1.2 V and emitter-base junction of Q1 has 0.6-V drop, for net drop of 0.6 V across R1 or R2. Dividing 0.6 by desired charge rate in amperes gives resistance value.-M. Alterman, A Constant-Current Charger for Nicad Batteries, QST, March 1977, p 49.



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