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Old 26th July 2010, 10:08 AM   #31
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Quote:
Originally Posted by godfrey View Post
I thought you were going for the 63V caps?
Lower ESR and higher ripple current than the 25V ones.
no?

I linked to, and gave specs for 25volt ones.

I wasn't sure what you were saying about 63volt caps.
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Old 26th July 2010, 10:24 AM   #32
godfrey is online now godfrey  South Africa
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Huh?

From Jaycar:

Capacitor Electrolytic 220uF 25V 105C L/ESR - Jaycar Electronics
Impedance: 0.13
Ripple Current mA rms: 640

Capacitor Electrolytic 220uF 35V 105C L/ESR - Jaycar Electronics
Impedance: 0.09
Ripple Current mA rms: 840

Capacitor Electrolytic 220uF 63V 105C L/ESR - Jaycar Electronics
Impedance: 0.060
Ripple Current mA rms: 1220

I thought the specs you gave looked like that last one.
The 1000uF 35V one is about twice as good, but also twice the price.
It would be nice to know what size they all are...

Last edited by godfrey; 26th July 2010 at 10:32 AM.
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Old 26th July 2010, 10:27 AM   #33
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Quote:
Originally Posted by godfrey View Post
Huh?

From Jaycar:

Capacitor Electrolytic 220uF 25V 105C L/ESR - Jaycar Electronics
Impedance: 0.13
Ripple Current mA rms: 640

Capacitor Electrolytic 220uF 35V 105C L/ESR - Jaycar Electronics
Impedance: 0.09
Ripple Current mA rms: 840

Capacitor Electrolytic 220uF 63V 105C L/ESR - Jaycar Electronics
Impedance: 0.060
Ripple Current mA rms: 1220
which is why I wasn't going to use 220uF, 35volt,

but rather 470uF, 25volt.
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Old 26th July 2010, 10:37 AM   #34
Magura is offline Magura  Denmark
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Have you checked that the caps are in the right way around?

Such heat build up in the caps, sounds like either the caps are dead, or wrong polarization.

Any junk cap should be able to handle that little bit of ripple.

Magura
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Old 26th July 2010, 10:39 AM   #35
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Originally Posted by Magura View Post
Have you checked that the caps are in the right way around?

Such heat build up in the caps, sounds like either the caps are dead, or wrong polarization.

Any junk cap should be able to handle that little bit of ripple.

Magura
if they were wrong, they would have exploded a very long time ago!
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Old 26th July 2010, 10:43 AM   #36
Magura is offline Magura  Denmark
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Not necessarily, they can survive quite some time if they are not loaded real hard, and the voltage is much lower than the rating.

Instead of wild guessing, how about you actually measure if they are in the right way?
After that, take one out and measure if it's in reasonable condition.

You have had quite a few suggestions so far, but have failed to take any action.
None of the suggestions made, would take more than 15 minutes to test.
Either take some action, or quit wasting our time.

Magura
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Old 26th July 2010, 10:45 AM   #37
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no, if they were around the wrong way they would have exploded a very long time ago...
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Old 26th July 2010, 10:50 AM   #38
godfrey is online now godfrey  South Africa
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Ah, OK. There's no specs for that one online.

For 470uF, the 35V and 63V ones have better specs, but I suppose you have to consider what fits too.

Anyway, good luck with it!

Edit: sorry, this was a reply to post 38.

Last edited by godfrey; 26th July 2010 at 10:52 AM.
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Old 26th July 2010, 10:51 AM   #39
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Originally Posted by godfrey View Post
Ah, OK. There's no specs for that one online.

For 470uF, the 35V and 63V ones have better specs, but I suppose you have to consider what fits too.

Anyway, good luck with it!
yes, the 25volt, 470uF are the same dimensions as the 35v 220uF.

plus, the 150amp esc I have only uses 25volt capacitors, and is rated for the same voltage.

I'm quite sure that 25volt caps is enough for 17volts
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Old 28th July 2010, 09:04 PM   #40
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oh, yeah, I haven't bothered replacing the capacitors yet as the motor failed
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