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

[Theo]

Good point.
I only used the hi-cap for supply filtering and signal coupling.
The 0805 2u2 25V part is what I used for signal coupling.
Seems ok, however still feel a bit unsure about the choice.
Its soo much smaller than the elco it replaces, there has to be some hidden
pitfall.

Cheers,
Theo


----- Original Message -----
From: harrybissell <harrybissell at prodigy.net>


> 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
> > >
>