[sdiy] What is this capacitor in the JP8?

[Jack Jackson]

Hi Rob, yeh I noticed you did. I was also wondering why you use a BA6110 on the resonance VCA? Is it any different to a CA3080 or so? I saw for the 4 220pf caps around the IR3109 you specify polystyrene or polypropolene instead of the ceramics used in the original. How come?

P.s. I messaged you about this already via fb.

Cheers,
Jack

----------------------------------------
> From: rob.keeble at amsynths.co.uk
> Date: Mon, 14 Oct 2013 15:33:57 +0100
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] What is this capacitor in the JP8?
>
> Hi
> I use high quality 1uf polarised capacitors here, as in the AM8109 Eurorack module. Can be any voltage above 16v, I use25v to keen the size down.
>
> Rob
>
>> On 14 Oct 2013, at 14:35, Neil Johnson <neil.johnson71 at gmail.com> wrote:
>>
>> Hi,
>>
>> Jack Jackson wrote:
>>> 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
>>
>> It depends. Maybe that's what they had in stock? Maybe that's what
>> was on special at the time? You need to understand the circuit to see
>> what the maximum voltage across it could be, including startup and
>> shutdown conditions, and possible latchup. The voltage rating will
>> also affect the case size, and also other electrical parameters like
>> ESR.
>>
>>> Also why they choose to use an electrolytic over a polyester?
>>
>> Cheaper?? Smaller?? Adds to the J8 "sound"?? Dunno. Try replacing it
>> with a polyester and hear what the difference is.
>>
>> Neil
>> --
>> http://www.njohnson.co.uk
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