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Constant AC current sourse

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samic45mit1

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Hello All,
I am working on conductivity meter using ATMEGA32 micro controller.For conductivity meter I need a constant current AC source for resistance measurement(conductivity).Please suggest some circuit idea for this.
Thankyou
 

It can be generated by opamp, resistor, pmos and a voltage source. Pls use opamp to regulate the voltage drop to be a fixed voltage.
 

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I am not able to understand how we can pmos and opamp for constant current sourse please tell me.
 

An example:
2_1297395974.gif
 
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