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

[David G Dixon]

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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