[sdiy] Re: Prophet 08 (was Roland DCOs)

[harrybissell at wowway.com]

SMT capacitors have to endure high process temperatures...
Only certain dielectrics are suitable ~and~ they will be
much larger physically.

oh.... and better too :^)

H^) harry



On Wed, 27 Feb 2008 20:44:41 -0500, Bruce Duncan wrote
> >
> >>
> >>>I was also
> >>>surprised by the ceramic chip caps used in the filter, after hearing
> >>>discussion about the suitability of different cap materials for audio
> >>>use (makes me wonder if the Moog LP uses chip caps in their filter).
> >>
> >>Its peculiar indeed, i have studied the Andromeda and it seams to
> >>use ceramic caps as well.
> >
> >Although it might not be a great idea, commercial synths often seem
> >to use it as a way to keep costs down. I can't think of any other
> >reason why you'd want to put ceramics in there.
> 
> SMT film capacitors are large in size, expensive and hard to find in 
> a wide range of values in anything other than garden variety polyester.
> This is probably the reason ceramics end up on SMT boards in 
> commercial synths.
> 
> Bruce
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


Harry Bissell & Nora Abdullah 4eva