Low Z noise problems

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Re: Low Z noise problems

Postby SymTech Laboratories » Fri Apr 12, 2013 9:10 am

neverlift19 wrote:on my board I have tip126 and a quick google search shows them to be in the same family, just slightly different ratings. Am I justified to say its safe to do the modification?

Yes, it's safe to do this modification.
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Re: Low Z noise problems

Postby neverlift19 » Fri Apr 12, 2013 3:59 pm

thanks I will report back later!
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Re: Low Z noise problems

Postby neverlift19 » Sun Apr 14, 2013 12:49 pm

Couldn't find a 50v 470uf cap but I did dig a 25volt off an old brushless speed controller, curious if the voltage is really important?

Thanks
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Re: Low Z noise problems

Postby dontz125 » Sun Apr 14, 2013 2:07 pm

You're trying to control flyback voltage, which will be significantly higher than 25v. Are you sure you want a 470uF? The others have been talking about 47, or 0.47 ...
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Re: Low Z noise problems

Postby neverlift19 » Sun Apr 14, 2013 2:54 pm

Honestly I dont know, I see some using 47uf some using 330uf .47uf I am honestly not sure and some of the links are dead :x I didnt get to go far on my test run... no log..
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Re: Low Z noise problems

Postby SymTech Laboratories » Sun Apr 14, 2013 6:05 pm

neverlift19 wrote:Couldn't find a 50v 470uf cap but I did dig a 25volt off an old brushless speed controller, curious if the voltage is really important?

The flyback voltage is clamped to 36V, so you really need a 50V+ rated capacitor.
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Re: Low Z noise problems

Postby neverlift19 » Sun Apr 14, 2013 7:57 pm

ok will get on that tomorrow. So whats the uf rating I 'should' be getting or is that a test and tune type of thing?
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Re: Low Z noise problems

Postby kjones6039 » Sun Apr 14, 2013 8:01 pm

FWIW.......

I have been using a 47uF/63v without issue......

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Re: Low Z noise problems

Postby moparmaniac » Mon Apr 15, 2013 6:01 am

Again, I'm using a 47uF 50V polarized (NOT bipolar) capacitor. Solved all of my noise issues.
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Re: Low Z noise problems

Postby neverlift19 » Wed Apr 17, 2013 12:55 pm

grr my radioshack is weak, a bunch of non helpful people work there. Almost blank faced when I asked about a polarized 50v 47uf cap... highest they had in stock was 35v so I guess I need to order online or see if anyone has one laying around, still getting voltage spike and sag however its a lot lower! msq below.
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Re: Low Z noise problems

Postby SymTech Laboratories » Wed Apr 17, 2013 1:16 pm

RadioShack carries a 100uF/50V capacitor (P/N 272-1044) that should work fine.
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Re: Low Z noise problems

Postby neverlift19 » Wed Apr 17, 2013 3:07 pm

I'll try that out next! The 47uf smoothed out the intensity a LOT down to within a 2 volts of swing vs 11 volt swings :yeah!:
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Re: Low Z noise problems

Postby neverlift19 » Thu Apr 18, 2013 12:32 pm

,6 volt swing I can completely live with THANKS YOU GUYS :yeah!:
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Re: Low Z noise problems

Postby SymTech Laboratories » Thu Apr 18, 2013 12:33 pm

Great! Thanks for reporting back!
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Re: Low Z noise problems

Postby neverlift19 » Sat May 18, 2013 9:30 am

after more logs the 100uf has much larger swing than I originally saw, it is closer to a 3 volt swing, found a 47uf 50volt cap I am going to try out today. Update later.
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Re: Low Z noise problems

Postby Peter Florance » Sat May 18, 2013 9:41 am

neverlift19 wrote:after more logs the 100uf has much larger swing than I originally saw, it is closer to a 3 volt swing, found a 47uf 50volt cap I am going to try out today. Update later.

Did you ever perform the sensor ground test?
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Re: Low Z noise problems

Postby neverlift19 » Sat May 18, 2013 1:28 pm

yes passed that, as soon as I read that I went and checked took 30 seconds :D
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Re: Low Z noise problems

Postby neverlift19 » Mon May 20, 2013 8:03 pm

have not logged to see if its smoother yet, been doing wiring and adding stuff :D

should I add this mod to the idle pwm too? have yet to set pwm for idle but its on the list for tomorrow morning.
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Re: Low Z noise problems

Postby neverlift19 » Thu May 30, 2013 5:36 am

ok after a few logs this is way worse. Its a very shaky swing of over 4 volts now. Undrivable at night with any electrical load :(
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Re: Low Z noise problems

Postby yellowlt1ta » Fri May 31, 2013 1:27 pm

I added a 47uf 35v polazided on the center legs of Q3 to Q9 with the negative side on Q3. none of the legs where lifted. is this right? this is on a v3.57

I have been using it like this and still get noise. I have my grounds done the correct way too.
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