>We also just figured out what the two multipliers do in the WG vector
>generator design; they multiply the square of the opposite channel's
>deflection value, scaled down by a voltage divider to the channel's
>value prior to it being scaled by the pot/VDR linearity circuit.
Oh, sorry, I could have saved you some time on that. I worked through all
the equations on the 1495's (based on the resistor values) a while back.
One 1495 squares the input voltage (thus getting a "positive" number
proportional to the beam's distance from the center of the screen) and
multiplies it against a scalar value to keep it within the voltage range of
the supplies.
The second 1495 then takes the new "correction" factor and multiplies it
against the second input voltage. The second input voltage still carries
the "sign" (positive or negative voltage) and just picks up the scalar
value from the first 1495. The product is the "corrected" aspect ration.
-Clay
Clayton N. Cowgill Engineering Manager
_______________________________________________________________________
/\ Diamond Multimedia Systems, Inc. clay@supra.com
\/ Communications Division http://www.supra.com/
Received on Tue Sep 2 11:48:14 1997
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