Korg Poly800/EX800 Users

 From: bimmerfan222 <bperkins211@...>
To: korgpolyex@yahoogroups.com 
Sent: Saturday, April 21, 2012 12:02 PM
Subject: [korgpolyex] Encoder/Decoder Circuit with counter & buffer
 

  
Hey Mike,

I've uploaded a pic of an encoder circuit using the chips you suggested. 

http://xa.yimg.com/kq/groups/3694848/or/465001900/name/encoder+counter+%26+buffer+circuit+v2.jpg

I chose to use a dual FF IC  (74HC74D) to decode the encoder.. I also tried to include a debouncing circuit before the signals go into the FF.

Please take a look and see if this is on the right path.  I left the 4024's reset line and the 74HC244's enable lines open for you to possibly show me how you use them with the Hawk Boards I/O lines.
I assume the outs on the 244 go directly to the main CPU bus.

Of course I only showed half of the full circuit for one encoder.. X out circuit is the same as Y outputs circuit.

I assume the counter changes it's output lines as a binary number.. so in essence, with 7 bits it can produce a number between 0 to 127?

Is it possible to test this thing with LED's at the outputs of either the counter or the buffer using a simple breadboard and 7 LED's?

Any further suggestions?  Am I on the right path with this design?

Thanks in advance for all your help.

-Blaine

>
> I am getting "We are sorry, you can not display images hosted by Yahoo! Groups on non Yahoo! Groups pages." when I try your link.
> 
> Is the diagram in korgpolyex somewhere?
> 
> Mike
> 
> 
> 
> ________________________________
>  From: bimmerfan222 <bperkins211@...>
> To: korgpolyex@yahoogroups.com 
> Sent: Saturday, April 21, 2012 12:02 PM
> Subject: [korgpolyex] Encoder/Decoder Circuit with counter & buffer
>  
> 
> Â  
> Hey Mike,
> 
> I've uploaded a pic of an encoder circuit using the chips you suggested. 
> 
> http://xa.yimg.com/kq/groups/3694848/or/465001900/name/encoder+counter+%26+buffer+circuit+v2.jpg
> 
> I chose to use a dual FF IC  (74HC74D) to decode the encoder.. I also tried to include a debouncing circuit before the signals go into the FF.
> 
> Please take a look and see if this is on the right path.  I left the 4024's reset line and the 74HC244's enable lines open for you to possibly show me how you use them with the Hawk Boards I/O lines.
> I assume the outs on the 244 go directly to the main CPU bus.
> 
> Of course I only showed half of the full circuit for one encoder.. X out circuit is the same as Y outputs circuit.
> 
> I assume the counter changes it's output lines as a binary number.. so in essence, with 7 bits it can produce a number between 0 to 127?
> 
> Is it possible to test this thing with LED's at the outputs of either the counter or the buffer using a simple breadboard and 7 LED's?
> 
> Any further suggestions?  Am I on the right path with this design?
> 
> Thanks in advance for all your help.
> 
> -Blaine
>

>
> 
> 
> Yes, the photo is on here in the Photos folder under "Encoder Project".
> 
> http://groups.yahoo.com/group/korgpolyex/photos/album/303237603/pic/list
> 
> 
> I guess it didnt like me using a direct link to the picture itself.
> 
> Be sure to click on "Original" next to the View options to see the full size pic.
> 
> -Blaine
> 
> 
> --- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@> wrote:
> >
> > I am getting "We are sorry, you can not display images hosted by Yahoo! Groups on non Yahoo! Groups pages." when I try your link.
> > 
> > Is the diagram in korgpolyex somewhere?
> > 
> > Mike
> > 
> > 
> > 
> > ________________________________
> >  From: bimmerfan222 <bperkins211@>
> > To: korgpolyex@yahoogroups.com 
> > Sent: Saturday, April 21, 2012 12:02 PM
> > Subject: [korgpolyex] Encoder/Decoder Circuit with counter & buffer
> >  
> > 
> > Â  
> > Hey Mike,
> > 
> > I've uploaded a pic of an encoder circuit using the chips you suggested. 
> > 
> > http://xa.yimg.com/kq/groups/3694848/or/465001900/name/encoder+counter+%26+buffer+circuit+v2.jpg
> > 
> > I chose to use a dual FF IC  (74HC74D) to decode the encoder.. I also tried to include a debouncing circuit before the signals go into the FF.
> > 
> > Please take a look and see if this is on the right path.  I left the 4024's reset line and the 74HC244's enable lines open for you to possibly show me how you use them with the Hawk Boards I/O lines.
> > I assume the outs on the 244 go directly to the main CPU bus.
> > 
> > Of course I only showed half of the full circuit for one encoder.. X out circuit is the same as Y outputs circuit.
> > 
> > I assume the counter changes it's output lines as a binary number.. so in essence, with 7 bits it can produce a number between 0 to 127?
> > 
> > Is it possible to test this thing with LED's at the outputs of either the counter or the buffer using a simple breadboard and 7 LED's?
> > 
> > Any further suggestions?  Am I on the right path with this design?
> > 
> > Thanks in advance for all your help.
> > 
> > -Blaine
> >
>

>
> Yeah, I see both of them now.
> 
> Yes, that circuit looks about right. I wouldn't use an LS chip for the schmidtt triggers. 74HC04 is low power. That part of the circuit looks like you cut and paste from some example circuit so perhaps that's all that was about.
> 
> What schematic software are you using?
> 
> Mike
>

>
> 
> 
> Yes, I did cut/paste the schematic together.
> I don't have a schematic software app.  
> Do you have any recommendations for a freeware app?  That and a freeware printed circuit board design app?
> 
> Also do you have any recommendations of a dual flip flop IC that would be more appropriate?  It appears that a dual FF is the way to go though.. it looks like the circuit refers to both signals and thru some form of subtractive comparison it will cause X or Y channel to pulse, depending one which way you turn the knob.
> 
> 
> On another note, I got around to repairing my P800's joystick last wknd and plan on purchasing a Hawk kit from you this week so I can get it installed prior to building test circuits for this encoder project.
> 
> Also, you might check new links I've posted here.. I've found a very nice P800 MkII pdf service manual (7.2MB) and a site with a huge host of schematics/serv. manuals for a ton of different synths, both old analogue and more recent digital synths.  It's where I found the MkII pdf.
> The MkII pdf is much much clearer to read than the MkI and MkII pdfs hosted here now.  I would have up'd it to the files section here, but yahoo wont allow anything upp'd that is over 5MB or so.
> 
> Thanks again for all your time/help,
> 
> -Blaine
> 
> --- In korgpolyex@yahoogroups.com, "korgpolyex800" <korgpolyex800@> wrote:
> >
> > Yeah, I see both of them now.
> > 
> > Yes, that circuit looks about right. I wouldn't use an LS chip for the schmidtt triggers. 74HC04 is low power. That part of the circuit looks like you cut and paste from some example circuit so perhaps that's all that was about.
> > 
> > What schematic software are you using?
> > 
> > Mike
> >
>

>
> 
> 
> Yes, I did cut/paste the schematic together.
> I don't have a schematic software app. 
> Do you have any recommendations for a freeware app?  That and a freeware printed circuit board design app?
> 
> Also do you have any recommendations of a dual flip flop IC that would be more appropriate?  It appears that a dual FF is the way to go though.. it looks like the circuit refers to both signals and thru some form of subtractive comparison it will cause X or Y channel to pulse, depending one which way you turn the knob.
> 
> 
> On another note, I got around to repairing my P800's joystick last wknd and plan on purchasing a Hawk kit from you this week so I can get it installed prior to building test circuits for this encoder project.
> 
> Also, you might check new links I've posted here.. I've found a very nice P800 MkII pdf service manual (7.2MB) and a site with a huge host of schematics/serv. manuals for a ton of different synths, both old analogue and more recent digital synths.  It's where I found the MkII pdf.
> The MkII pdf is much much clearer to read than the MkI and MkII pdfs hosted here now.  I would have up'd it to the files section here, but yahoo wont allow anything upp'd that is over 5MB or so.
> 
> Thanks again for all your time/help,
> 
> -Blaine
> 
> --- In korgpolyex@yahoogroups.com, "korgpolyex800" <korgpolyex800@> wrote:
> >
> > Yeah, I see both of them now.
> > 
> > Yes, that circuit looks about right. I wouldn't use an LS chip for the schmidtt triggers. 74HC04 is low power. That part of the circuit looks like you cut and paste from some example circuit so perhaps that's all that was about.
> > 
> > What schematic software are you using?
> > 
> > Mike
> >
>

>
> Hi Blaine,
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â  This kind of stuff is beyond the capabilities of my organic MPU but I use designspark PCB myself.
> RE service manual You could use 7-zip (free) to split the PDF into 2 or 3 zipped folders that you can upload individually. Any one who wanted the service manual would then download all zipped parts and re combine them. You just click on part 1 FI and it should do the recombining automatically. 
> 
> Martin
> 
> 
> 
> ________________________________
>  From: narfman96 <narfman96@...>
> To: korgpolyex@yahoogroups.com 
> Sent: Saturday, 28 April 2012, 17:09
> Subject: [korgpolyex] Re: Rehosted Encoder/Decoder Circuit with counter & buffer
>  
> 
> Â  
> Hi Blaine,
> 
> I've been quietly lurking along....
> 
> www.expresspcb.com is my personal favorite for creating schematics and designing boards. I am not affiliated in any way.
> 
> Keep up the great work, Fran
> 
> --- In korgpolyex@yahoogroups.com, "bimmerfan222" <bperkins211@> wrote:
> >
> > 
> > 
> > Yes, I did cut/paste the schematic together.
> > I don't have a schematic software app. 
> > Do you have any recommendations for a freeware app?  That and a freeware printed circuit board design app?
> > 
> > Also do you have any recommendations of a dual flip flop IC that would be more appropriate?  It appears that a dual FF is the way to go though.. it looks like the circuit refers to both signals and thru some form of subtractive comparison it will cause X or Y channel to pulse, depending one which way you turn the knob.
> > 
> > 
> > On another note, I got around to repairing my P800's joystick last wknd and plan on purchasing a Hawk kit from you this week so I can get it installed prior to building test circuits for this encoder project.
> > 
> > Also, you might check new links I've posted here.. I've found a very nice P800 MkII pdf service manual (7.2MB) and a site with a huge host of schematics/serv. manuals for a ton of different synths, both old analogue and more recent digital synths.  It's where I found the MkII pdf.
> > The MkII pdf is much much clearer to read than the MkI and MkII pdfs hosted here now.  I would have up'd it to the files section here, but yahoo wont allow anything upp'd that is over 5MB or so.
> > 
> > Thanks again for all your time/help,
> > 
> > -Blaine
> > 
> > --- In korgpolyex@yahoogroups.com, "korgpolyex800" <korgpolyex800@> wrote:
> > >
> > > Yeah, I see both of them now.
> > > 
> > > Yes, that circuit looks about right. I wouldn't use an LS chip for the schmidtt triggers. 74HC04 is low power. That part of the circuit looks like you cut and paste from some example circuit so perhaps that's all that was about.
> > > 
> > > What schematic software are you using?
> > > 
> > > Mike
> > >
> >
>

>
> Hi Blaine,
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â  This kind of stuff is beyond the capabilities of my organic MPU but I use designspark PCB myself.
> RE service manual You could use 7-zip (free) to split the PDF into 2 or 3 zipped folders that you can upload individually. Any one who wanted the service manual would then download all zipped parts and re combine them. You just click on part 1 FI and it should do the recombining automatically. 
> 
> Martin
> 
> 
> 
> ________________________________
>  From: narfman96 <narfman96@...>
> To: korgpolyex@yahoogroups.com 
> Sent: Saturday, 28 April 2012, 17:09
> Subject: [korgpolyex] Re: Rehosted Encoder/Decoder Circuit with counter & buffer
> 
> 
> Â  
> Hi Blaine,
> 
> I've been quietly lurking along....
> 
> www.expresspcb.com is my personal favorite for creating schematics and designing boards. I am not affiliated in any way.
> 
> Keep up the great work, Fran
> 
> --- In korgpolyex@yahoogroups.com, "bimmerfan222" <bperkins211@> wrote:
> >
> > 
> > 
> > Yes, I did cut/paste the schematic together.
> > I don't have a schematic software app. 
> > Do you have any recommendations for a freeware app?  That and a freeware printed circuit board design app?
> > 
> > Also do you have any recommendations of a dual flip flop IC that would be more appropriate?  It appears that a dual FF is the way to go though.. it looks like the circuit refers to both signals and thru some form of subtractive comparison it will cause X or Y channel to pulse, depending one which way you turn the knob.
> > 
> > 
> > On another note, I got around to repairing my P800's joystick last wknd and plan on purchasing a Hawk kit from you this week so I can get it installed prior to building test circuits for this encoder project.
> > 
> > Also, you might check new links I've posted here.. I've found a very nice P800 MkII pdf service manual (7.2MB) and a site with a huge host of schematics/serv. manuals for a ton of different synths, both old analogue and more recent digital synths.  It's where I found the MkII pdf.
> > The MkII pdf is much much clearer to read than the MkI and MkII pdfs hosted here now.  I would have up'd it to the files section here, but yahoo wont allow anything upp'd that is over 5MB or so.
> > 
> > Thanks again for all your time/help,
> > 
> > -Blaine
> > 
> > --- In korgpolyex@yahoogroups.com, "korgpolyex800" <korgpolyex800@> wrote:
> > >
> > > Yeah, I see both of them now.
> > > 
> > > Yes, that circuit looks about right. I wouldn't use an LS chip for the schmidtt triggers. 74HC04 is low power. That part of the circuit looks like you cut and paste from some example circuit so perhaps that's all that was about.
> > > 
> > > What schematic software are you using?
> > > 
> > > Mike
> > >
> >
>