On 5/22/07, Paul Schreiber put forth:
> > I'm a bit confused here. Do the Bourns pots fit the holes in the
> > PCB's originally designed for Spectrol??
>
>No. All of the pc boards would need to be redone.
Yikes. That is a PITA. Maybe it would be better to use Bourns lug
pots and change the board brackets, or use 248 pots, or find some
other solution, rather than have all the boards redone??
While I don't know anything about CAD/CAM, changing the design seems
like it would be fairly simple. However, as I see it, the problem
isn't trying to figure out how to move a few holes around, it's that
you would have to pay for all new boards, and would be stuck with the
old boards. That sounds like an expensive proposition you would want
to avoid.
You asked for comments, so I'm just throwing ideas out there. I'm
not trying to tell you how to run your business.
> > Does Bourns make cermet pots suitable for VCO's??
>
>I don't think so, but what I can do is change the pcb slightly so the voltage
>swing is much less across the pot to minimize the drift. The Coarse/Fine pots
>are ratiometric, which reduces drift anyway.
>
>24x are all plastic. I tried those on the original MOTM modules. Awful!!!
According to Richard Brewster, the 249 cermet pots have metal shafts.
So maybe they aren't so bad?? Regardless, the MOTM-300 is the
flagship of the line, so I would be extremely hesitant in reducing
its durability or performance in any way. Perhaps it's one case
where using 149 pots would be worth it, even if you make less profit
on that one module.