[NBLUG/talk] a problem with audio noise

jezra jezra at jezra.net
Thu May 30 20:27:06 PDT 2013


On the bright side, nothing exploded; however, nothing worked either.
Right now I'm thinking of all of the electronic devices that I've taken
apart and how I should have saved the ferrite doohickeys. grrrrr

On Thu, 30 May 2013 16:22:07 -0700
Mitch Patenaude <patenaude at gmail.com> wrote:

> Another thing to keep in mind: Electrolytic capacitors are
> polarized.  They need to be hooked up in the right way.  There will
> be one leg labeled minus (-), and that leg needs to be hooked up to
> ground, and the other to the +5 line.  If you get it backwards, you
> may cause the capacitor to "vent" (i.e. blow up).
> 
>   -- Mitch
> 
> 
> On Thu, May 30, 2013 at 2:11 PM, jezra <jezra at jezra.net> wrote:
> 
> > Thanks Frank,
> > I have a few similar capacitors (a few 6v, one 10v, and some 35v) so
> > hopefully something will work. The voltage going to the amp is 5v.
> >
> >
> >
> > > Jezra,
> > >
> > > Use a aluminum electrolytic capacitor.
> > >
> > > I don't know what the voltage of your power supply is.  5V?
> > > Capacitor companies lie about their voltage ratings.  If you put
> > > a 5V cap on a 5V circuit it will eventually blow up or short out
> > > or just stop working. Multiply the voltage by at least two, or
> > > better yet three. Get a capacitor of that voltage or higher.
> > >
> > > I don't know anything about your power supply or your amp, but
> > > 100uF (micro Farads) should do it.  Smaller would have less
> > > effect, but if that's all you have give it a try.
> > >
> > > Aluminum electrolytic capacitors look like this:
> > >
> > >
> > http://image.made-in-china.com/2f0j00uBVtoMvqfNbl/High-Ripple-Current-Aluminum-Electrolytic-Capacitor.jpg
> > >
> > >    E Frank Ball                efball at efball.com
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