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Old 10-27-2010, 10:41 PM   #3914 (permalink)
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Thanks paul I will check over all those parts tomorrow and here are the pics for you I just couldn't get a good pic of the soldering though the light just wasn't right but I assure it is adequate.
Just looking at the datasheet for that transistor. Its an npn darlington not an igbt or fet. I would imagine (not sure) that it would require a different driver stage. Also it looks to be quite a slow device in terms of switching ability. What frequency are you using on the arduino? The revolt default is 16khz which i would say is too high for those parts.
Hmm I had it up to 8 k at one time and it worked ok but 1.5k was the normal driving frequency I used. When I had this car up on jack stands I was testing the throttle for the revolt to watch the wheels turn it seemed to keep up with the switching time it turned the wheels. Just when I put the car down it did some funny stuff. It seemed to pull so much current that there was no electrolyte left in my batteries I had to refill them today!! How could it have done this?? Vaporized the electrolyte?? The data sheet says 3us for switching time whatever that means maybe you can elaborate?
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