Misappropriating Mr Plato...A circuit which can properly divide is to be considered a god...
After messing about with AD633s I opted for the AD734 (allows an external denominator voltage/direct denominator control). The transfer function is (X1 - X2)(Y1 - Y2)/(U1 - U2). Much more interesting than multiplication because of the can of worms which potential zero divides opens up. All the difficult stuff is done by the AD734, but the things has proliferated to no fewer than eleven chips...some switching to handle a negative denominator (if U1 - U2 is negative it is swapped and the output inverted), plus various checks e.g. that the magnitude of X1 - X2 is less than 1.25 that of U1 - U2 (required by the AD734).
After messing about with AD633s I opted for the AD734 (allows an external denominator voltage/direct denominator control). The transfer function is (X1 - X2)(Y1 - Y2)/(U1 - U2). Much more interesting than multiplication because of the can of worms which potential zero divides opens up. All the difficult stuff is done by the AD734, but the things has proliferated to no fewer than eleven chips...some switching to handle a negative denominator (if U1 - U2 is negative it is swapped and the output inverted), plus various checks e.g. that the magnitude of X1 - X2 is less than 1.25 that of U1 - U2 (required by the AD734).
I had to buy a bigger breadboard(!)...
The final construction...
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