XOR circuit using op-amps plz help

[yes_secreto]

XOR circuit po sana using op-amps(741) lang...lam ko may equivalent logic gates ito sa simpler...pero sana may mabigay kau na simplest circuit using op-amps po....plzzzzzzzzzz,,,,tnx

[dummy_c]

http://img703.imageshack.us/i/xoru.jpg/

This tip shows the use of the comparator to
implement an XOR gate and its complement the
XNOR gate.
The operation is best described in three
sections:
1. Both A and B inputs are low
 With both inputs low, the inverting input
 is held at .7V and the non-inverting is held
 at ground. This combination results in a low
 output.
2. Both A and B inputs are high
 With both inputs high, the inverting input is
 pulled up to VDD and the non-inverting input
 is equal to 2/3 VDD (the average of VDD inputs
 and GND). This combination also results in a
 low output.
3. Input A or B is high
 With one input high and one low, The
 inverting input is held at .7V and the
 non-inverting input is equal to 1/3 VDD (the
 average of a VDD input and GND). This
 combination results in a high output.

P.S.
Taken from TIPS ‘N TRICKS from microchip. Sa tingin ko pwede ma configure na comparator ang 741.. Pero baka may i-modify pa. Good luck po.