More on Crosspoints.

[Paul Maddox]

Tony,

>
>    The MAX335 looks like an excellent chip for your application, Paul!
>

heres hopeing.. though Im still gonna need 9 boards :-(

>
>    Having looked at the Mitel chip MT8816, I noticed that you can
> literally control each switch.  Well, wouldn't it work that if you tie
> the output lines directly to an opamp's in I/V configuration and then put
> the input resistor on the input line of the crosspoint...would that work
> then?  You wouldn't get any additional feedback from one channel to the
> next because the inputs are now protected.  The output is your summing
> node of your op-amp which should now handle the multiple signals being
> fed by the multiple switch-points.

Nope, you have a different problem then.

If you had say input 1 connected to outputs 1,2 and 4
and input 2 connected to output 2 and 3
you would effectivly join ALL the I/V inputs of ALL the output opamps,
remember that
the switch matrix is as good as a 0ohms.

>    Feedback?  I'm probably way off.  :)
>

nope, just a different problem..
Its a good problem this isnt it!!
Interesting aswell.

Paul Maddox