Simple transducer to convert 0-5V to 0-20mA, good linearity

[hcet]

Hi everybody,
I'm looking for a very simple and 'cheap' curcuit of a transducer to convert 0-5V to 0-20mA with good linearity. There is also no need to isolate in- and output. It should have a very low parts count. The fewer the parts count, the better it would fit. I'm not looking for any modules. Maybe someone knows an IC, which is well suited. Any idea is appreciated.
Regards and thanks, ep20k

 

[as_518]

Re: Simple transducer to convert 0-5V to 0-20mA, good linear

use op-amp with resistance 5/.002= 2.5k

 

[IanP]

Re: Simple transducer to convert 0-5V to 0-20mA, good linear

With Re=250Ω you will have conversion from 0-5V to 0-20mA ..
(for your application you need only one part)
rgs
IanP

 

[simce]

Re: Simple transducer to convert 0-5V to 0-20mA, good linear

One more note about schematic from IanP:

Vbat>0,2+I(Re+Rload).

Also check disipated power on transistors (Pdis=Vce*Ic)!