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Vss circuit discrepancy

Posted: Fri Feb 20, 2015 11:06 pm
by Rukavina
I have had issue with vss like a lot of us on the 4l80 build. The build sheet and bom ask for 47pf capacitors in locations c28 ,c29,c32,c33.
I was looking at the actual board schematics and found that there are different values. The " speedup caps" are 470pf on these prints........
I have went with a circuit using a nte995 tachometer chip. I am fighting noise right now and it works perfect until I stop moving. I will get it(it's a learning experience) but if this misprint was the issue with so many ........

Re: Vss circuit discrepancy

Posted: Fri Feb 20, 2015 11:46 pm
by Addicted
This explains why the label on the bag of 47pf caps from the DIY Autotune kit is labeled C28, C29, C32, C33.. I did wonder