Ni-Cd Baterry Charger 12-18V

Posted on Feb 28, 2013

A clever charger circuit that safely can charge any Ni-Cd battery. Offers charge current sellection, polarization detection and protection and the ability to connect many batterys in siries. Ni-Cd bateries can be recharged more than 1000 times before become useless. the charging current shoud be the 1/10 of the (Ah) of the battery. The bateries need 14 hours to be fully charged..

Ni-Cd Baterry Charger 12-18V - image 1
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Swhitch S2 is the current selection as folows: 50mA, 200mA and 400mA. LED D10 is the indicator for proper batery connection and/or wrong polarity checking. LED D9 is the charging indicator. The transformer is a 220V/2x12V 0.5A. PARTS: R1,R4,R5=10K R2,R3=100K R6,R8,R10=1K R7=820 R9=100 R11=15 R12=3,9 R13=1,8 C1=1000uF/40v C2=470pf D1-D4,D6=1n4001-7 D7,D8=1n4148 D9,D10=LED IC=741 TR1=BC548 TR2=BD137 TR3=2N3055

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