Hi Friends, I am using a temperature transmitter connceted to my heat exchanger. The temperature transmitter gives me current output in 4-20 ma current range. I want to convert this 4-20 ma current signal to voltage in the 1-5 volt range. for which i will use the circuit : http://www.allaboutcircuits.com/vol_1/chpt_9/3.html I need to convert this voltage in the range of 1 to 5 volt so that i can perform data acquisition on pc. But i need a adc circuit which will take this input vtg and then interfacing it to the pc at the parallel port. Plzzzzzzzzzz i need help in designing the adc circuit for the same.