Re: Need to design precision 5mA constant current source (wide temp range).. need help
From: John Fields (jfields_at_austininstruments.com)
Date: 11/22/04
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Date: Mon, 22 Nov 2004 17:34:34 -0600
On 22 Nov 2004 14:41:04 -0800, stephendeese@hotmail.com (stevo) wrote:
>Hi,
>
>I need to design a 5mA constant current source for a Wheatstone bridge
>application. The problem is the source needs to be +- 3% accurate and
>hold that accuracy over a -40 C to +85 C temperature range.
>
>I have thought about using a simple FET CCS, but don't have much
>experience and am not sure if I can make it accurate enough.
>
>Can any of you more experienced guys point me in the right direction?
>
>Thank You
>Stephen
>
>Ohter info : V avalible +15V; bridge resistance ~ 850 ohms
--- Does one end of the bridge need to be connected to ground? -- John Fields
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