Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Power supply question.....

> scott wilson wrote:
>
> > Jon Elson wrote:
> >
> > >
> > > I have built gear with over 10,000 22 uF 16 V Panasonic mocrominiature caps,
> > > running on either 5 or 12 V, and had no trouble with them whatsoever.
> > >
> > > Jon
> > >
> >
> > sounds like good conservative design.......
> >
> > Please remember that we are looking at the AC Component of the voltage being applied to the cap.
> >
> > for instance with a 24v xformer and full wave bridge you are putting either about 34v ac or more on that cap
>
> No, completely wrong. There is a couple of volts of ripple on the capacitor,
> depending on how much droop occurs due to the load draining the
> capacitor between charging pulses from the transformer. If you put 34 V
> peak on a sizable capacitor, it will explode within seconds. At no load,
> there will be almost no AC on the capacitor. At full load, you would not
> want to see much more than 1 V droop (at 120 Hz) under normal conditions.
> If you use too small a capacitor, the droop will be larger, and the AC ripple
> current may cause the capacitor to run hot and fail early. Another reason
> to use a large capacitor is to ride through short power dips.
>
> Jon
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
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