[sdiy] What is this capacitor in the JP8?

[Richie Burnett]

Often electrolytic capacitors are chosen with a higher than necessary voltage rating to meet a DC leakage current spec at the operating voltage. I think higher voltage electrolytics are formed with a thicker oxide layer. As someone else said, it also affects ESR too, and Lowest-ESR isn't always bestest.

-Richie,

Sent from my Sony Ericsson Xperia ray

Tom Wiltshire <tom at electricdruid.net> wrote:

>Hi Jack,
>
>> Thanks. Is the 50v an important factor here, or was it just specified so people wouldn't use something too low like 16v for example? I've found some cheap 100v ones here. 
>> http://www.hificollective.co.uk/catalog/rbd030-047uf-100vdc-elna-bipolar-capacitors-p-9449.html
>
>If the schematic says 50V, we have to assume that they worked it out, taking all the factors that Neil mentioned into account, then added what they thought was a reasonable margin of error*. So anything >=50V should be fine. Sometimes higher voltage caps have a difference tolerance, so you might consider that - a 50V part might be 5%, but the 100V part might be 10%.
>
>> Also why they choose to use an electrolytic over a polyester?
>
>What Neil said. It was what they had, or what they could get cheap, or what would fit in the space left on the PCB. Whatever it was, I'd bet money it wasn't because someone thought it sounded better. If it does, that's a happy accident.
>
>HTH,
>Tom
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy