constant-current timing charging circuit

Published:2011/5/16 20:05:00 Author:Christina | Keyword: constant-current, timing, charging | From:SeekIC

The 12V AC voltage is rectified by the D1 and becomes the 16.8V DC charging voltage, the R1，R2 and the constant-current source tube BG supply the base bias. R3，R4 and R5 are the current limiting resistor to limit the charging current between 50 to 100 mA, and it is switched by K. This circuit is very simple, and has no timeout protection measures, so you need to notice the timing.



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