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.
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