REQ - Loop current

[niktesla]

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?



niktesla

[dennis78]

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...   

[FriskyFerret]

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.