[sdiy] ASM-1 newbie & cap questions

[Happy Harry]

Hi Sandro... (inline)


>From: "sandrotraversi" <straversi at libero.it>
>To: <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] ASM-1 newbie & cap questions
>Date: Mon, 4 Mar 2002 13:14:19 +0100
>
>Hi folks !
>
>building my 1st ASM i'm meeting my first difficulties also in finding
>requested parts ...
>
>1 - vco fet should be 2N4856 or 2N4391 - it'd be good also a BF245 ?
>2 - i made some errors in my RS order - so now i got polystyrene cap 2200pF
>/ 160Vdc !!!
>Is too high as a volt value ? I must swap them to 50 vdc ???

Higher voltage is OK... as long as mechanical fit is possible.

>3 - as above , also for lfo/glide big cap I got a big ceramic 1,0uF / 100
>vdc !  better swap ?

I'd get a different one. Ceramic in that voltage and value is probably
a Z5U (not very good for temperature stability or tolerance).  I'd
prefer a polycarbonate type here. Avoid using Polyester (Mylar) because the 
dielectric absorption is 20x worse than polycarbonate or
polystyrene.

OTOH you may not notice  ;^)

>4 - that 18pF cap in vco - i can't find that value so i picked a styrene
>15pF - is still good ?

Good.

>5 - again that 30pF cap in vcf - i can't find them so i picked a styrene
>33pF - are still good ?

Good.

Good luck.  I wrote a capacitor tutorial that lives at 
www.musicsynthesizer.com and some other sites as well. Maybe
you should check it out.

H^) harry
>
>many thanks for any hints ...
>
>sandro
>




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