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Solar-powered Battery Charger

Solar-powered Battery Charger
It takes only a handful of components to build our intelligent regulator. It uses a PIC 12C671 microcontroller, which has the double advantage of being housed in an 8-pin DIL package and containing a multi-input analogue/digital converter (DAC).
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Component list
R1 = 15kOhm
R2-R4 = 5kOhm6
R5,R7 = 2kOhm2
R6,R8 = 820Ohm
P1,P2 = 1kOhm potentiometer
C1 = 470 µF 25V
C2,C5,C6 = 100nF
C3 = 220nF
C4 = 10nF
C7 = 10µF 25 V
D1= 1N5821
D2,D3 = 1N4148
D4 = 1N4004
D5 = zener diode 4V7 400mW
Q1,Q2 = BC548
IC1 = 78L05
IC2 = PIC12C671, programmed, see Downloads
Rel1,Rel2 = relay, 10A contact
F1 = fuse, 2A
4-way SIL pinheader
6 PCB terminal blocks, 5mm lead pitch
1 wire bridge
PCB, ref. 080225-I from www.thepcbshop.com
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