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Rogoffs' voice trigger LED board schematic?

2014-11-05 by r_j_d_2.phila@...

hi all, so i was looking over the data on the rogoffs.com, and found images for the KAS wiring for the trigger LED, which i'm thinking of tackling. however, does anyone have the schematics/layout of the breadboard? thanks much, RJ

Re: [yamahacs80] Rogoffs' voice trigger LED board schematic?

2014-11-05 by David Rogoff

Hi.

The schematic is in the same photo group on the site:

https://groups.yahoo.com/neo/groups/yamahacs80/photos/albums/35984432/lightbox/1778166358?orderBy=ordinal&sortOrder=asc&photoFilter=ALL#zax/1778166358

It’s basically the same circuit that’s on the output of the KAS board. If GATE is -6.5v (or around that - which is a “1”), the transistor is off so the 12k resistor pulls one side the LED to a positive voltage. The other side of the LED is ground, so this lights one of the two colored LEDs in the package. If GATE is +8.5v (which is “0”), the transistor is on, pulling the LED to a negative voltage which lights the other color LED. Or maybe I got it backwards. Anyway, if it’s the other way, just flip the wires from the LED around :)

David

On Nov 5, 2014, at 12:41 PM, r_j_d_2.phila@... [yamahacs80] <yamahacs80@yahoogroups.com> wrote:

hi all, so i was looking over the data on the rogoffs.com, and found images for the KAS wiring for the trigger LED, which i'm thinking of tackling. however, does anyone have the schematics/layout of the breadboard? thanks much, RJ

Re: [yamahacs80] Rogoffs' voice trigger LED board schematic?

2014-11-05 by florian anwander

Hello

Am 05.11.2014 21:41, schrieb r_j_d_2.phila@... [yamahacs80]:

> hi all, so i was looking over the data on the rogoffs.com, and found
> images for the KAS wiring for the trigger LED, which i'm thinking of
> tackling. however, does anyone have the schematics/layout of the
> breadboard? thanks much, RJ

Why do you want to put it on the KAS board? Put the LED on the
Voiceboard itself. There you will need it when you are tuning the synth.
Also it is much easier to achieve.

See http://fa.utfs.org/diy/yamaha_cs60

Florian

Re: [yamahacs80] Rogoffs' voice trigger LED board schematic?

2014-11-05 by David Rogoff

Yes - I did that on my CS60 many years ago. However, on a CS80 there’s two issues: which M card do you put it on? Already you have the issue of no driver transistor so you start loading the gate signal and a CS80 has that going to two different cards for each of the eight. If you put LEDs on all 16 cards, then you’re really loading down the gate signals. If you get really efficient, low-current LEDs and use big limiting resistors (equals very dim lights), you can probably get away with it.

David

> On Nov 5, 2014, at 1:14 PM, florian anwander fanwander@... [yamahacs80] <yamahacs80@yahoogroups.com> wrote:
>
> Hello
>
> Am 05.11.2014 21:41, schrieb r_j_d_2.phila@... [yamahacs80]:
>> hi all, so i was looking over the data on the rogoffs.com, and found
>> images for the KAS wiring for the trigger LED, which i'm thinking of
>> tackling. however, does anyone have the schematics/layout of the
>> breadboard? thanks much, RJ
>
> Why do you want to put it on the KAS board? Put the LED on the
> Voiceboard itself. There you will need it when you are tuning the synth.
> Also it is much easier to achieve.
>
> See http://fa.utfs.org/diy/yamaha_cs60
>

Re: [yamahacs80] Rogoffs' voice trigger LED board schematic?

2014-11-05 by florian anwander

Hello David

I have done this mod on two CS60, a CS80, and a CS50 and I never had any
troubles.

Florian

Am 05.11.2014 22:25, schrieb David Rogoff david@... [yamahacs80]:

> Yes - I did that on my CS60 many years ago. However, on a CS80 there’s
> two issues: which M card do you put it on? Already you have the issue of
> no driver transistor so you start loading the gate signal and a CS80 has
> that going to two different cards for each of the eight. If you put LEDs
> on all 16 cards, then you’re really loading down the gate signals. If
> you get really efficient, low-current LEDs and use big limiting
> resistors (equals very dim lights), you can probably get away with it.
>
> David
>
> > On Nov 5, 2014, at 1:14 PM, florian anwander fanwander@...
> [yamahacs80] <yamahacs80@yahoogroups.com> wrote:
> >
> > Hello
> >
> > Am 05.11.2014 21:41, schrieb r_j_d_2.phila@... [yamahacs80]:
> >> hi all, so i was looking over the data on the rogoffs.com, and found
> >> images for the KAS wiring for the trigger LED, which i'm thinking of
> >> tackling. however, does anyone have the schematics/layout of the
> >> breadboard? thanks much, RJ
> >
> > Why do you want to put it on the KAS board? Put the LED on the
> > Voiceboard itself. There you will need it when you are tuning the synth.
> > Also it is much easier to achieve.
> >
> > See http://fa.utfs.org/diy/yamaha_cs60
> >
>
>

Re: Rogoffs' voice trigger LED board schematic?

2014-11-06 by r_j_d_2.phila@...

thanks guys. all told, it looks like it'd be easier to put it on the KAS board, personally, as it bypasses taking 8 cards out. but as long as both work, then i'd say its 6-1/half dozen-other, right? good info-think i'm gonna tackle this!

Re: [yamahacs80] Rogoffs' voice trigger LED board schematic?

2014-11-06 by David Rogoff

FYI, I just posted a photo of the version I built a few months ago. I used LEDs with 3 leads so I can control the red and green separately. Then I was able to use the transistor circuit for each to get brighter colors without loading the gate signal.

Take a look:

https://groups.yahoo.com/neo/groups/yamahacs80/photos/albums/35984432/lightbox/747380088

David

On Nov 6, 2014, at 5:16 AM, r_j_d_2.phila@... [yamahacs80] <yamahacs80@yahoogroups.com> wrote:

thanks guys. all told, it looks like it'd be easier to put it on the KAS board, personally, as it bypasses taking 8 cards out. but as long as both work, then i'd say its 6-1/half dozen-other, right? good info-think i'm gonna tackle this!

Re: [yamahacs80] Rogoffs' voice trigger LED board schematic?

2014-11-06 by r_j_d_2.phila@...

should i be concerned with a load on the gate signal with your revision 1? brightness, i don't really care about. as long as i have SOME indicator on the gates, it'll save me having to guess+turn on/off when i tune.