Re: how to recondition capacitors ? - update

Hi guys,

thanks for respondind to my request.

I wound up putting a 24VAC transformer into a 24VAC transformer to
get less than 8 volts.

I rand this low volatage into a rectifier and then connected it to a
cap via 220ohm resisstor network (5 resistors at 3 watts each in
parallel)

The cap charged quickly, but I let each sit for over an hour, then
pulled the lines off and let it sit again. I figured that with any
internal leakage, the voltage would drop noticably in a rapid time.

Tha caps were 10,000 uF (2 caps) and one 15,000uF each held the
voltage for over an hour and then I applied a 10k resistor across the
leads to let it blead.

Since the application will only be about 35 volts, I figured I didn't
need to ramp up the voltage, just jump to 35 V.

I've used one so far and it appears to be working great.

Thanks to those who replied.

Dave






--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<davemucha@j...> wrote:

> Thanks,
>
> once I run that thru the charging process, how can you tell if it

is

> still good enough for use in a power supply ?
>
> and darn, all my power resistors are less than 100 ohms. I'll have
> to get some parts.
>
> In checking, I wound up with 3 10,00uF, a 15,000 and a 22,000 uF

not

> bad for striping old boxes.
>
> I wish some of the power supply stuff was rated for more than 6

amps

> though. nice input filters on the old boxes.
>
> Dave
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "luskwyo" <skraft@w...>

wrote:

> > You can reform them by applying the rated voltage through a 25-

30k,

> 5
> > watt resistor.
> > The voltage across the resistor should drop to 5-10% of the

applied

> > voltage in an hour or less.
> > When you are done the cap. will be charged to the applied

voltage,

> put
> > a resistor across the termanals to discharge it.
> > Shane
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> > <davemucha@j...> wrote:
> > > Hi,
> > >
> > > I have a few 10,000uF,50V caps from old printers and wanted to
> make
> > > sure they were up to snuff before putting them in service.
> > >
> > > I've read that one should reformat them or recondition them but

I

> > > couldn't anything regarding how to do it.
> > >
> > > also, any tests to do to make sure they would be good for a

powe

> > > supply ?
> > >
> > > any ideas ?
> > >
> > > Dave