Hi everyone,
New to the forum and looking for some help.
im trying to design a voltage to current converter (op amp) to output 25mA at full input and 5mA at zero input. Ive been struggling with this, i've been trying to connect the supply rails with potential dividers across the input to hold the minimum 5mA around the loop. But this is where I hit problems. Does any body have any advice on how to achieve this ?
Thanks in advance

 

Show as your diagram, and tell as about input voltage range.

And this circuit can do the work

I_load = R2/R1 * ( Vb - Va)/R4

http://www.national.com/an/AN/AN-1515.pdf

 

My circuit input voltage range is quite small. It will be 0volts to 18.714mVRMS

 

@Jony130 Im interested in that circuit design, my circuit has a single input signal so should i connect a supply rail to to the inverting input ?
Here is a basic circuit ive been attempting, but it has an extreemly large input coupling capacitor: