[Coco] WTB Orchestra 90 cartridge
zippster278 at gmail.com
Mon Aug 1 00:50:58 EDT 2016
PCBs should arrive tomorrow, so hopefully we’ll find out how they work later this week.
> On Jul 31, 2016, at 11:06 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> A couple questions:
> * Looking at the schematic of the orch 90, it looks like 3 of the caps
> are non polarized electrolytic.
I don’t want to open mine either, but I believe you are correct.
> On your redesign, it looks like
> you swapped out for ceramic or something similar.
Yes, I used just plain ceramics, which I suspect will be just fine here, but hey
that’s what prototypes are for. :)
> Was there some
> reason why Tandy used the non polarized (I had not heard of them
> before perusing the schematic)
I can’t think of one.
> * The r2r ladder. I assume the original resistor networks were 1/8W
> or 1/4W Did you go with 1/4W or 1/8W on the surface mount
> replacements? Or, did you go with something smaller?
Bourns isolated resistor arrays. Rated .16 W per resistor, so somewhere in-between.
> I hate to open my sealed cart up, or I could probably answer part of the second question. Anyone have hires pics of an open cart?
There’s a pic in the folder here, but not very high resolution.
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