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X-Recipient: | geda-user AT delorie DOT com |
Date: | Tue, 15 Apr 2014 19:54:25 +0100 |
From: | Richard Bown <richard AT g8jvm DOT com> |
To: | geda-user AT delorie DOT com |
Subject: | [geda-user] printed meter shunts |
Message-ID: | <20140415195425.37808583@richard-laptop> |
Organization: | Ham radio |
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Reply-To: | geda-user AT delorie DOT com |
Hi, I thinking of playing with the LTC1645 using its for over current shut down, it requires only 50mV across a shunt resistor to trip, at 10A thats 5milli ohm. And those resistors in TO-220 packages are expensive, so I was thinking why use a length of wide track, needs to wide as handling up to 10A . Are there any tables to give track resistance if the thickness , width and length are known. In practice its better to go for a lossier track and tap the voltage across it with a potential divider, so target around 10 - 20 milli ohms, cant use anything bigger as the board will get hot, 10A through 0.02 R is 2 W, so better around 0.01 R Thanks -- -- 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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