Electrical – DAC Output to 4-20mA


I have a Microcontroller with a DAC output of 0-3.3V. What external circuitry can I use to convert it into a 4-20mA current transmitter.

Best Answer

you could have the DAC in series with a 165 ohm resistor, although this would only give you the right current if the other end of the resistor is grounded. it's not a proper current source, but if you use it to drive a current mirror, that could work.