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Subject: Re: design of 4-20mA circuit

Date: 07/27/00 at 3:34 PM
Posted by: Ned Stevens
E-mail: K7ELP@aol.com
Message Posted:

In Reply to: design of 4-20mA circuit posted by Bruce cincotta on 07/25/00 at 2:45 PM:

I donot know much about 4-20MA loops, but if you need a source of 4-20MA Dc from 120V line I have a few ideas.
Using ohms law I calculate you will need between 3 and 15 volts with 750 ohm load. If this is the case a three terminal regulator such as a LM317LZ and be configured to do this. The regulator will drop several volts so with approximately 20 volts in the desired output can be achieved. If this is what you need I can help you further with the design.
Ned E. Stevens

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