[sdiy] Newbie capacitor questions 2 - Return of the Cap.

[harrybissell]

NPO is actually quite good...

those ceramics designed to replace lytics are another story.  For non critical
power
supply filtering etc. they are fine (if you oversize them... they have a really
LARGE
capacitance change with temperature).

I would NOT use them in a timing application. Its not the leakage that will get
you, their
capacitance value changing is the issue

H^) harry

Chris CROSSKEY wrote:

> Wouldn't the leakage be a problem with a ceramic or is npo way better than
> normal?
>
> chrisc
> ----- Original Message -----
> From: "Theo" <t.hogers at home.nl>
> To: <samppa.tolvanen at gmail.com>; "Magnus Danielson" <cfmd at bredband.net>
> Cc: <ijfritz at earthlink.net>; <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, January 10, 2005 1:28 AM
> Subject: Re: [sdiy] Newbie capacitor questions 2 - Return of the Cap.
>
> > I've used ceramics (47n NP0) for LFO and found no problems.
> > Think VCO should be fine too the LFO's go into audio range without
> > trouble.
> >
> > Not NP0 but Murata hi-cap series can be quite fun and let you use a 1206
> > or
> > 0805 10u/25V ceramic instead of a elco.
> > The 10V and 6,3V parts even go up to 100u.
> > Didn't test these parts for envelope use though...
> >
> > Theo
> >
> >
> > ----- Original Message -----
> > From: Magnus Danielson <cfmd at bredband.net>
> > To: <samppa.tolvanen at gmail.com>
> > Cc: <ijfritz at earthlink.net>; <synth-diy at dropmix.xs4all.nl>
> > Sent: Sunday, January 09, 2005 6:27 PM
> > Subject: Re: [sdiy] Newbie capacitor questions 2 - Return of the Cap.
> >
> >
> >> From: Samppa Tolvanen <samppa.tolvanen at gmail.com>
> >> Subject: Re: [sdiy] Newbie capacitor questions 2 - Return of the Cap.
> >> Date: Sun, 9 Jan 2005 19:20:13 +0200
> >> Message-ID: <fa1b0bd805010909201d2d9eea at mail.gmail.com>
> >>
> >> > On Sun, 09 Jan 2005 09:14:02 -0700, Ian Fritz <ijfritz at earthlink.net>
> > wrote:
> >> > > Ceramic has a significant soakage effect, as someone pointed out here
> >> > > previously.  They seem to work pretty well, anyway, though.
> >> >
> >> > ..but not recommended for "critical" parts of the circuit - like osc.
> >> > integrator cap ect.?
> >>
> >> Exactly!
> >> LFO and envelope circuits should be places to think about soakage and
> > memory
> >> effects.
> >>
> >> Ceramics may however be usefull for HF-caps in the negative feedback etc.
> >> For LF they are virtually not "in" and for HF they really need to be.
> >>
> >> Cheers,
> >> Magnus
> >