Re: Vector Hardware

Man, my grammar is getting bad. must be the solvent fumes in the air here today.
Apologies. :-)

Jess Askey wrote:
>
> The DAC08 is performing the linear scaling for the vector generator. the vector counter
> can do the binary scaling (preset sizes). But if you want and object to change size
> gradually you need the linear scaling.
> If you watch the linear scale test, you see a box growing gradually out of the center. I
> think the way is works is that the output of the DAC08 is the input of the AM6012's +ref
> or something. Essentially, the DAC is a linear control of the XY DAC's positive rail.
> If you watch the binary scale test, you will see the box jump from on scale factor to
> another. It can't do smooth scaling.
>
> I did't thing that Tempest had linear scaling? Am I thinking of the wrong DAC-08?
>
> jess
>
> Mendel Pearl wrote:
> >
> > Yes! Finally I got my Tempest AVG working again!
> >
> > The problem turned out to be the MC1495 multipliers, which was a real hard job
> > tho find these here in Holland.
> >
> > My other Tempest board still has a problem with the X defection, the Y is
> > working after replacing the current/voltage opamp (TL082) , thanks Rodger! This
> > little baby indeed caused the virtual ground to be not 'grounded' :)
> >
> > Maybe somebody could help me out on this one:
> >
> > What is the DAC08 doing in the circuit? So far as I can see from the schematics
> > and MC1495 datasheets, it seems to me that the MC1495 multipliers perform the
> > east-west correction (pincushion).
> > As you can see from the circuit, the output current of the DAC08 is directly
> > summed to that of the XY DACs.
> > Maybe somebody could shine a light here? I am really trying to know how the AVG
> > functions exactly...
> >
> > Thanks!
Received on Fri Nov 12 12:37:40 1999