[sdiy] ASM-1 cap types

[Theo]

I would probably use:
1) Normal  Elkos, tantalum only when specified.
2) IMO for (100n) decoupling caps multi-layer is the pick
3) Also ceramic multi-layer for everything from 470n to 1n
4) Ceramic disk/plate below 1n
5) Polyester/Mylar/MKT for critical stuff, like SH, timing cap in a VCO, VCF
filtercaps(maybe).
Think the ASM is not too critical, except for the VCO timing cap,
multi-layer should work ok.

Some pp vote against ceramics in the audio path.
While there are applications (like high end mic pre-amps) where they do have
a point,
multi-layer works ok for many applications as is shown by almost all
commercial available audio equipment.
OTOH some pp won't be satisfied with the sound of a fuzz box unless all caps
in the audio path are silver-mica.

Theo



From: <synth at charlielamm.com>
To: Stephen Begin <trypannon at hotmail.com>
Cc: synth <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, March 25, 2003 3:38 AM
Subject: Re: [sdiy] ASM-1 cap types


> I used ceramics for the 18pF and 100pF on my ASM-1 VCO and it worked fine.
>
> I used mylar for the 2n2 on the VCO and it worked fine.
>
> Can't speak for the other caps (VCF, VCA etc) as I have not built these
> circuits.
>
> On Mon, 24 Mar 2003, Stephen Begin wrote:
>
> > I did check the archive for this, but didn't find any answers
> >
> > I'm hoping to build an ASM-1 as my next project, and I'm having trouble
> > figuring out what kind of caps to use.  I guess I don't have the
experience
> > to tell me what would be good choices, it mentions that polystyrene and
> > polycarbonate caps are "good caps" and on the elby designs page where
they
> > sell the kit, they say
> > "All capacitors less than 1nF are generally polystyrene*
> > All capacitors between 1nF and 1uF are generally polyester*
> > All capacitors greater than 1uF are generally tantalum* "
> >
> > I can't seem to find polystyrene caps smaller than 100pF on mouser,
would
> > ceramic be okay for the 18pF and 30pF caps?
> >
>