On Fri, 20 Oct 2006 06:20:26 +0100, Art Deco put
finger to keyboard and composed:

On Fri, 20 Oct 2006 00:56:49 +0100, Eeyore
wrote:



Art Deco wrote:

On Thu, 19 Oct 2006 14:53:37 +0100, Eeyore
wrote:
Art Deco wrote:

Hi everyone,

I've been upgrading a simple power supply in a satellite receiver
using a kit provided by a company selling spares.

I've noticed that there's quite a bit of difference between the
original capacitor values and the upgraded replacements provided, for
instance

Old New

47uF, 35V 100uF, 35V
2200uF, 10V 2200uF, 16V
330uF, 16V 470uF, 35

etc

My querstion is: do the upgraded capacitors only work together as a
set or can any one of them be replaced with the upgraded value?

In any combination you like.

OK, thanks.

In the latter case, a follow-up quesion would be how much variation in
capacitor value is permissible (presumably as long as it's higher)?

It's just a *maximum* voltage.

So in the third example above, where a 330uF 16V cap is replaced with
a 470uF, 35V cap, it wouldn't be advisable to exceed 35V for the
replacement?

It's not going to exceed 35V is it ? The voltage must be under 16V or the
original cap wouldn't have been suitable.

I meant the voltage rating of the replacement capacitor.
Would it make a difference here if a 470uF 50V capacitor was used?

The only things I would be concerned about would be whether the higher
voltage types had higher leakage, which *may* effect some timing
applications, or whether the higher voltage types had higher ESR
values, which would result in poorer performance in switchmode supply
applications (as stated elsewhere in this thread).

- Franc Zabkar
--
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