Article
Rechargeable Battery Checker
Measure capacity by controlled discharge
The author’s rechargeable battery collection comprises a large number of cells of various types, ages and states. Surely he cannot be the only person who would find a ‘capability meter’ for batteries of great value and interest!
Gerber file
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PCB
Component list
COMPONENT LIST
Resistors
R1 = 470(
R2,R4,R5,R10 = 1kOhm
R3 = 10kOhm
R6–R9 = 1( 1% 0.5W
P1 = 20kOhm trimpot, horizontal
Capacitors
C1,C2,C3 = 100nF
C4,C6 = 10µF 10V, radial, 2mm/5mm pitch
C5 = 100µF 10V, radial, 2.5mm/6 mm pitch
C7,C8 = 22pF
Semiconductors
D1,D2 = BAT43
D3 = 1N4001
D4 = LED, red, 3mm
T1 = IRL3803
LCD1 = TC1602C
IC1 = ATmega88-20, programmed, Elektor # 120447-41
IC2 = LM285-2V5
IC3 = 7805
Miscellaneous
LCD1 = LC display 2x16, e.g. Elektor # 120061-71
K1 = 10-pin (2x5) pinheader, 0.1‘‘ pitch
K2,K4 = PCB terminal block, 0.2‘‘ pitch
K3 = 3-way receptacle, 0.1’’ pitch
JP1–JP4 = 3-pin pinheader, 0.1’’ pitch
S1 = pushbutton
PCB # 120447-1
Resistors
R1 = 470(
R2,R4,R5,R10 = 1kOhm
R3 = 10kOhm
R6–R9 = 1( 1% 0.5W
P1 = 20kOhm trimpot, horizontal
Capacitors
C1,C2,C3 = 100nF
C4,C6 = 10µF 10V, radial, 2mm/5mm pitch
C5 = 100µF 10V, radial, 2.5mm/6 mm pitch
C7,C8 = 22pF
Semiconductors
D1,D2 = BAT43
D3 = 1N4001
D4 = LED, red, 3mm
T1 = IRL3803
LCD1 = TC1602C
IC1 = ATmega88-20, programmed, Elektor # 120447-41
IC2 = LM285-2V5
IC3 = 7805
Miscellaneous
LCD1 = LC display 2x16, e.g. Elektor # 120061-71
K1 = 10-pin (2x5) pinheader, 0.1‘‘ pitch
K2,K4 = PCB terminal block, 0.2‘‘ pitch
K3 = 3-way receptacle, 0.1’’ pitch
JP1–JP4 = 3-pin pinheader, 0.1’’ pitch
S1 = pushbutton
PCB # 120447-1
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