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Solar Tracker

I need a cheap solar tracker circuit for 12v dc motor.Also when is getting dark go back to east and wait the sun....Now the only thing i need is the UA747C chip

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This may seem like a dumb question, but since you're trying to create 2 comparators, why don't you just start out with a dual comparator like the LM2903. If you configure your sensors correctly, (vertical sun block between them), you won't even need the dark sensor, (as has already been mentioned), and with a couple MOSFETS you can probably eliminate the relays too. I haven't looked up the rating on the 747 op-amp, but I wouldn't trust it to reliably drive a relay without causing other problems.