Hi I looked at your circuit in the posting. Can I use a low power Quad Op-Amp for this purpose? Like LM 124 or something? So that I can have 2 channels from one chip. Also Supply voltage must be 8V? or Can I have +/-15? I was thinking of changing it to +/-10 input to 0-10 o/p. 5V clamping diode is necessary? Or can I live without it as long as my i/p will not exceed. Now when you mentioned 2.5Vref in the reference ckt, are you thinking of another resistor for the divider? Please let me know.
Thanks