[sdiy] Good choice of capacitor type for Moog 904A VCLPF 4 stages...

[Tom Wiltshire]

Another vote for WIMA red bricks. My preferred cap for audio filters - a good balance of quality and price. They're mostly pretty small too, though watch out for the width. There are various ranges (FKP, FKS, MKS, or MKP), with the letters explained in this thread:

http://www.diystompboxes.com/smfforum/index.php?topic=81011.0;prev_next=next

I do dig the old polyester blob caps too though, like the greenies already mentioned. Panasonic do a load of nice orange ones I've used sometimes. I might use something like that for a ladder filter just for the vintage vibe of it.

T.


On 8 May 2014, at 06:36, David G Dixon <dixon at mail.ubc.ca> wrote:

> I have never built a ladder filter, but for cascaded-stage filters, I really
> like the WIMA poly caps, the little red bricks.  They work really well. 
> 
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl 
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
>> Jean-Pierre Desrochers
>> Sent: Wednesday, May 07, 2014 5:53 PM
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] Good choice of capacitor type for Moog 904A 
>> VCLPF 4 stages...
>> 
>> I posted that question some days ago with no replies left..
>> Here it is again:
>> I'm not an engineer and try to figure out what type of 
>> capacitor would be the best to be used for the 4 low pass 
>> stages of a Moog 904A low pass filter ?
>> I read that some type tends to be 'microphonic' and other 
>> have easily DC leakage... And I know that polystyrene are 
>> greatly appreciated for their 'stable' caracteristics.. (but $$$).
>> I found Panasonic has the ECQ series that could be a choice 
>> but.. and what about film polypropylene ?
>> I'm in the process of PCB design and need to choose the good 
>> cap footprints for the 3 capacitors I'll use which are: 1.2uf 
>> 0.33uf  and 0.075uf like in the original Moog drawing.
>> 
>> Your good advises are WELCOME !!!
>> JP
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> 
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