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Subject: Re: [geda-user] printed meter shunts
From: Nathan Stewart <therealnathanstewart AT gmail DOT com>
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No - I have not, but I do have a 5A (20A inrush if not limited) current
monitoring problem coming up, and another idea kicking around for an active
load where I'd need to monitor about 5A or so with minimal influence on a 4
Ohm nominal speaker load. So I'm interesting in what happens here.

I was planning to use an ACS712ELCTR-20A-T (it's 6.3VAC sitting about 100V
above ground - so that fancy doodad kills a couple birds with one stone)
but it's also somewhat spendy.

How about something like DigiKey 408-1615-2-ND - 5m Ohm, 3W, 2512W, that
should take care of your SMT issue. (When I saw TO220 I figured you were
looking for a through hole device).


On Tue, Apr 15, 2014 at 4:31 PM, Richard Bown <richard AT g8jvm DOT com> wrote:

> On Tue, 15 Apr 2014 15:20:54 -0400
> Nathan Stewart <therealnathanstewart AT gmail DOT com> wrote:
>
> > Why does it need to be TO-220? 3W wire shunt is about 50 cents.
>
>
> Have you tried measuring 0.005 Ohm with shunt wire ?
>

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<div dir=3D"ltr"><div><div>No - I have not, but I do have a 5A (20A inrush =
if not limited) current monitoring problem coming up, and another idea kick=
ing around for an active load where I&#39;d need to monitor about 5A or so =
with minimal influence on a 4 Ohm nominal speaker load. So I&#39;m interest=
ing in what happens here.<br>
<br></div>I was planning to use an ACS712ELCTR-20A-T (it&#39;s 6.3VAC sitti=
ng about 100V above ground - so that fancy doodad kills a couple birds with=
 one stone) but it&#39;s also somewhat spendy. <br><br></div>How about some=
thing like DigiKey 408-1615-2-ND - 5m Ohm, 3W, 2512W, that should take care=
 of your SMT issue. (When I saw TO220 I figured you were looking for a thro=
ugh hole device). <br>
<div><div><div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote=
">On Tue, Apr 15, 2014 at 4:31 PM, Richard Bown <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:richard AT g8jvm DOT com" target=3D"_blank">richard AT g8jvm DOT com</a>&gt;=
</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">On Tue, 15 Apr 2014 15:20=
:54 -0400<br>
Nathan Stewart &lt;<a href=3D"mailto:therealnathanstewart AT gmail DOT com">therea=
lnathanstewart AT gmail DOT com</a>&gt; wrote:<br>
<br>
&gt; Why does it need to be TO-220? 3W wire shunt is about 50 cents.<br>
<br>
<br>
Have you tried measuring 0.005 Ohm with shunt wire ?<br></blockquote></div>=
<br></div></div></div></div></div>

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