RE: MC1495's

> So technically you don't need any 4 quadrant multipliers. You need a
> squaring circuit (do they make such things?) and a 2 quadrant
> multiplier
> since Y squared is never negative.
>
You still need one 4-quadrant multiplier. The 1495's can multiply two
inputs together and then multiply that by a constant. The first chip
does A=(Y*Y)*Z where Y is the Y-deflection signal and Z is a small
fraction that represents the amount of "correction" (set by a pot).
The second chip does B=(A*X)*W where X is the X-deflection singnal
(which varies from about -12V to +12V) and W is a width control (set by
a pot). B is then used as the X-axis output to the monitor.

-Clay
Received on Fri May 15 09:17:31 1998