04-18-2011, 11:47 PM
#123
(04-18-2011, 02:59 AM)Pali I think, the big blue capacitor is not the indication for PWM. He is on power supply (pin 1,2) and he serve as supply filtering (from my opinion).
Yes, i have apply rect. signal on pin 4.
Can anybody confirm, that the actuator works with rect. signal 140Hz (moves he to the middle position)?
Many thanks in advance.
I can't confirm the pin at the moment, but a 50% 140Hz square wave should cause it to move to approximately the middle position.
I highly doubt the big cap would have anything to do with PWM, its definitely there for input power filtering. The only differences I can see in the 2 boards seem to be some other capacitors. I'd assume they are filtering capacitors that were later found to be not necessary and removed to save on costs, but its possible that the PWM signal passes through one of them. I'll scope them when I'm done with the next controller design..last one was ready for production before I lost it, damn hard drive failures...
I have a video on youtube somewhere as well showing the signal on a scope and the actuator at the same time.
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GT2256V??? |
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