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Author Topic: REQ - Loop current  (Read 1140 times)
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niktesla
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« on: November 17, 2008, 09:40:18 21:40 »

Hi,

I need test equipment that works with a stream of 4-24 MA, someone knows some very simple circuit that can be done with few components?



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dennis78
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« Reply #1 on: November 17, 2008, 10:10:55 22:10 »

you can use simply integrated solution with AD694 or some classic circuit with opamps like:
http://photos1.blogger.com/blogger/879/242/1600/v-to-i.gif

or you want something circuit with one resistor...   Wink
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FriskyFerret
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« Reply #2 on: November 17, 2008, 10:58:13 22:58 »

Quote
someone knows some very simple circuit


Two 9V batteries, a multimeter set to mA, a resistor and a pot will do the job. Choose the resistor to set the current at 25 mA. Add a pot configured as a variable resistor with enough resistance to limit current to 3 mA. To use the test circuit, put the multimeter in the current loop and adjust the pot to your desired current.

Don't forget about the current sensing resistor in the multimeter.
« Last Edit: November 17, 2008, 11:04:36 23:04 by FriskyFerret » Logged

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