> The Old Crow <mailto:oldcrow@...>
> November 14, 2011 5:12 PM
> I have plans to make an SMD M-board. What I need is to find a spare
> Yamaha M board that isn't priced at $500. Even one with all the custom
> chips removed is fine as it is mostly needed for metrics.
>
> As far as other filter topologies, let me get an M board working
> first. ;) It will have better tuning trimpots, and a better stop
> selector. I have two outlines for M board refits: original and
> digitized. The digitized version would use a local microcontroller to
> manage parameter presets...but that is a ways off yet. The prototypes
> look like Yamaha TF-1 circuit boards because I am using an old TX FM
> rackmount chassis as the test bed. I call the thing my CSR-80. But
> actual M boards have to fit where vintage ones fit, so eventually it all
> has to be compacted.
>
>
Super-mega-cool! Since this is looking real, I have a couple of real
requests/suggestions (although I'd still love multiple filters!):
∗ Put all trimmers and testpoints on front and top of card so cards
don't have to be removed (or top removed) for full calibration
∗ Put most used trim pots (e.g. tuning) on top edge for easiest access
with card cage down
∗ Gate LED! Simple, but really helpful
∗ great if you can find a good high-density connector so
o all connections on back edge of card
o board can unplug
o has to have enough slack on existing harnesses so that all the
wires can reach this new connector
∗ I don't think any clocks (e.g. for digital E.G.s) come to the
M-Boards. You might want a section of the connector or a 2nd
connector for new digital and analog signals that would wire to a
new common board under the keybed for this and future expansion.
OK, I'll stop now...
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