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Date: | Tue, 15 Apr 2014 22:38:08 +0100 |
From: | Richard Bown <richard AT g8jvm DOT com> |
To: | geda-user AT delorie DOT com |
Subject: | Re: [geda-user] printed meter shunts |
Message-ID: | <20140415223808.5df05324@richard-laptop> |
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On Tue, 15 Apr 2014 17:14:15 -0400 Nathan Stewart <therealnathanstewart AT gmail DOT com> wrote: > 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). Hmmm, you've got me thinking Nathan, 2512 package directly on the pcb may get warm , but if mounted piggy back on a high value resistor or cap with the same footprint may well do it, Thanks > > > 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 ? > > -- -- Best wishes /73 Richard Bown Email : richard AT g8jvm DOT com HTTP : http://www.g8jvm.com nil carborundum a illegitemis ################################################################################## Ham Call G8JVM . OS Linux Mint 16 x86_64 on a Dell Inspiron N5030 laptop Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W QRV VHF 6mtrs 200W, 4 mtrs 150W, 2mtrs 400W, 70cms 200W Microwave 23 cms 140W, 13 cms 100W, 6 cms 0W & 3cms 5W ##################################################################################
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