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

 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

Datasheet file1: Click here to download LM741.pdf datasheet.

Datasheet file2: Click here to download BC548.pdf datasheet.

Datasheet file3: Click here to download BD137.pdf datasheet.

Datasheet file4: Click here to download 2N3055.pdf datasheet.