Re: 0 - 10 VDC to 4 - 20 mA conversion

--- In CAD_CAM_EDM_DRO@y..., flyspeck1@a... wrote:

>
>
> OK, this one should be pretty simple. Does anyone have
> a quick and dirty circuit that will convert a 0 to 10
> VDC output on my DAC to the required 4 to 20 mA input
>

It would be easier if I could attach a gif image of a circuit but
can't be done here! So here is the next best thing. Go to
http://www.chipcenter.com/eexpert/dashby/dashby012.html

You need a Voltage to Current Converter (one of the four basic type
of electronic circuits used in modeling) although the article is
somewhat technical, read down about halfway and you will find a
simple single op amp circuit that uses the amp (ua741, LM324, etc)
and two resistors to develop a given current based on a given input
voltage. The simple formula is there as well. Since the resistor
and the load are in series the amount of current flowing though the
first resistor is the same as what flows through the load (your
250ohm device). You will have to provide power to the op amp which
can be Vcc+. Hope this helps.