[ARC5] AC Motor Start Caps as Filters

[Dave Sublette]

In the time we have been discussing it, I wired one up and turned it on.
Of course, I rolled it out in the driveway and turned it on with my ten
foot stick I used to turn on all my projects on with the first time. As
soon as I can find my extension cord, I'm going to plug it in and try it
again.



73,

Dave,  K4TO

On Tue, Mar 24, 2020 at 6:30 AM Doran Platt <jeepp at comcast.net> wrote:

> All comments have been correct.  The thing is, for  a given capacitance,
> they are physically much larger than a typical  equiv. electrolytic cap.
> But, why ditch usable parts.
> K3HVG  Jeep
>
> On March 23, 2020 at 10:36 PM Roy Morgan < k1lky68 at gmail.com> wrote:
>
>
> Ken,
>
> Your numbers make sense, but I would check with someone knowledgeable at
> the manufacturer before counting on my memory from years ago.
>
> Roy Morgan
> K1LKY Western Mass
>
> On Mar 23, 2020, at 10:31 PM, Kenneth G. Gordon < kgordon2006 at frontier.com>
> wrote:
>
> On 23 Mar 2020 at 22:20, Roy Morgan wrote:
>
>
> I remember a report quite some time ago now from a fellow who spoke in
> person with an
> engineer at a manufacturer and asked about the dc rating of such
> capacitors. The engineer
> laughed and said the practical dc rating would be something like four
> times the peak of the rms
> ac rating.
>
>
> OK. Then, if I have my figures correct, the peak AC rating for 125V RMS
> would be 1.414 X
> 125 = about 176 V which X 4 = 707 VDC. So, 1200 MFD at 700 VDC.
>
> Sounds like a darned good filter cap to me!!! :-)
>
> Ken W7EKB
>
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