Built this back about last Xmas; thought it was time I put it in my diary.
Similar to RedRok's led3x
http://www.redrok.com/led3xassm.htm#led3xc3
Read his article for an explanation of the 2 gated oscillators U1D & U1C.
I couldn't obtain the IR2184's locally except in smd, hence the redesign using my favourite components, a 4093 and too many diodes.
Although drawn for 24 volt operation, conversion to 12 volts should be easy. Delete the 2 x 12 volt zeners D12 & D13, and the regulator comprising Q9 and associated components.
I tested it by taping the board to the gearbox output shaft of a geared head coin hopper motor I obtained from Oatley electronics. Over the course of the day it tracked the sun perfectly.
Here's the circuit in pdf format;
http://www.otherpower.com/images/scimages/2006/solar_tracker.pdf
and a picture of the board
The pcb layout was done with Protel autotrax for dos. Email me if you want a copy.
Amanda
