mu load is 0.3 A. will 5uF be enough?
YOurs SaRIn....


On Tue, Aug 3, 2010 at 7:32 PM, Funny NYPD <funnynypd@yahoo.com> wrote:

> 47uf, that's a lot. You must have a large load, what's the current your
> device
> normally takes? I found a 1uf normally would work fine for small loads su=
ch
> as
> 0.1A.
>
>  Funny N.
> Au Group Electronics, http://www.AuElectronics.com
> http://www.AuElectronics.com/products
> http://augroups.blogspot.com/
>
>
>
>
> ________________________________
> From: Sarin Sukumar A <sarinsukumar@gmail.com>
> To: Microcontroller discussion list - Public. <piclist@mit.edu>
> Sent: Tue, August 3, 2010 3:53:36 AM
> Subject: Re: [EE]LM317 regulator output voltage fluctuation
>
> Thanks for the help,
> i figured out the problem, the capacitance i connected in the output was
> below 1uf, when i connected 47uF it works fine.
> YOurs SaRIn....
>
>
> On Mon, Aug 2, 2010 at 11:25 PM, Oli Glaser <oli.glaser@talktalk.net>
> wrote:
>
> >
> >
> > --------------------------------------------------
> > From: "Sarin Sukumar A" <sarinsukumar@gmail.com>
> > Sent: Tuesday, August 03, 2010 7:09 AM
> > To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> > Subject: [EE]LM317 regulator output voltage fluctuation
> >
> > > I am converting 9V to 3.3V using LM317.
> > > But here i met a strange problem. LM317 output fluctuates with a
> humming
> > > noise.
> > > my circuit has 3 another ICs working in this 3.3Voltage. But no one i=
s
> > > getting heated.
> > >
> > > do any one know any solution to this problem?
> > > thanks for the help...
> > > YOurs SaRIn....
> > > --
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> >
> > Hard to say what's going on without more info really. A few questions..
> > Have you tried it with the LM317 output disconnected from the rest of t=
he
> > circuit to help locate where the problem actually lies?
> > Have you got the correct capacitance/loading on the LM317 as specified =
in
> > the datasheet? i.e is it within specifications for stable operation?
> > What are the other ICs in the circuit? What is it's purpose?
> > When you say fluctuates - how fast? Is it oscillating or just drifting?
> > What pitch is the humming noise? Which part of the circuit does it seem
> to
> > be coming from?
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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