AC voltage to current converter


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Is there some standard circuit I can find on the net that converts an AC voltage from a function generator to constant current? Thanks in advance for the feedback.
I built a cct that takes the input of a AC current probe across a resistor (AC voltage) into a precision diode (741 op amp cct) then into a dc voltage to current cct to give a 4-20 mA output (another 741 cct). These ccts and how to design them came from the Op amp cook book.
Dear matthewhyatt,

Thank you very much but can u tell me that how can i convert the dc voltage to current then...

Yours truly,