David can you explain how the tuning would work without the technical stuff?
I think installing it right next to that ugly Kenton switch would be a good place for it.
And can we add spinning fans right under the vents?
J/K about the last part.
hahha
-Scott
________________________________
> To: yamahacs80@yahoogroups.com
> From: r_j_d_2.phila@...
> Date: Mon, 15 Sep 2008 17:23:10 -0700
> Subject: Re: [yamahacs80] Auto-tuner / tuner assist idea
>
>
> thanks for putting the thought into this, david. im in the same boat as scott; i dont understand the nuts and bolts, but i could be interested in this as a functional device for tuning. as far as panel mounting, i wouldnt be willing to mod the front panel of mine, though, so i would have to find another place to put it.
>
> --- On Mon, 9/15/08, David Rogoff wrote:
> From: David Rogoff
> Subject: [yamahacs80] Auto-tuner / tuner assist idea
> To: yamahacs80@yahoogroups.com
> Date: Monday, September 15, 2008, 7:44 PM
>
> Hi all.
>
> Well, we had out CS80 BBQ yesterday. It was a good time with lots of
>
> noise :^). More on that later.
>
> Toward the end of the afternoon, we were talking (actually, Scott M.
>
> was requesting/begging) about some kind of auto-tuner for the beast. I
>
> thought about a few ways to do it, but then I realized I have a few
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> others things to do in the next couple of years, so I dropped the
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> plan. However, I have thought of a pretty simple board that could be
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> mounted in the CS80 to really speed up the manual tuning procedure and
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> not require any external tuner or test equipment.
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> I've put a scan of my first sketch here: http://launch. ph.groups. yahoo.com/ group/yamahacs80 /photos/browse/ 68f7?
>
> c=
>
> Quick explanation: I grab the 8 trigger/gate signals and convert them
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> to binary with a 4532 (this whole thing uses the same 4000-series CMOS
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> chips that are already used all over the CS80). One place this goes is
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> a 4511, which drives a 7-segment LED display, showing you a number
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> from 0 through 7 for which pair of board is triggered. If you hit more
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> than one key at a time, all bets are off!
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> The binary code also controls the 4051 8-to-1 muxes in the upper
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> right, which are wired with the pulse outputs from each voice card.
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> Therefore, you automatically select the correct oscillators. (I just
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> realized, since only one key is allowed to be hit at a time, the muxes
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> can just be OR gates). These go through a couple of 4013 flip-flops
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> which turn them into nice, clean square waves at octave down.
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> Next, at the bottom of the page, we've got a crystal tuning reference
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> (could include a jack for an external reference??) . This is divided
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> down to all the required octave for tuning. Another pair of 4051s pick
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> the correct octave automatically based on the Feet switches.
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> Finally, in the circuit above this, the oscillator outputs are X-ORed
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> (digital ring-mod - easy to hear/see beat frequency) with the
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> reference tone. These drive red/green LEDs that show the beat
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> frequency. Also, a pair of switches allow sending the oscillator,
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> reference tone, or X-OR tone from either channel to an audio output.
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> This lets you hear the tones, which can help with tuning, especially
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> if the oscillators are way off.
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> Comments? Criticisms? Suggestions? Would this be something people
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> would want to install in their keyboards? It would probably mount
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> inside the front panel, near the Feet switches.
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> More later,
>
> David
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