Super Ni-Cd Battery Charger 12-18V Circuit Diagram

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.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. 

Super Ni-Cd Battery Charger 12-18V Circuit Diagram


Super Ni-Cd Battery Charger 12-18V Circuit Diagram





 PARTS LIST
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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