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 Forum index » DIY Hardware and Software » Musical Interfaces
Analog keyboard controller.
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fede409



Joined: Mar 28, 2012
Posts: 2
Location: Argentina

PostPosted: Thu May 09, 2013 9:44 pm    Post subject: Analog keyboard controller.
Subject description: Someone help me with the checking of the PCB.
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Hi everybody! I found this circuit in a book called "Nueva generacion de instrumentos musicales electronicos". I take the job of making the PCB, I need someone to check, maybe I'm forgetting something. The components of this driver are very easy to get. According to the author, you must take special care in selecting the 100R resistor.
I'm Posting the link to download the book. The download is free and is authorized by the author. (Sorry but I'm not a native speakers)

schematic:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

wiring:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

PCB:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

the book:

http://www.mediafire.com/?h935d8xyijdlmdz
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AndyR1960



Joined: Feb 16, 2007
Posts: 281
Location: Manchester UK
Audio files: 5

PostPosted: Fri Mar 28, 2014 10:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Well… It's taken some time for me to do this project, but the layout works fine.

Be aware of the 2k7 1% resistor for the keyboard divider driver, as it looks like 27k on the PCB component layout. The only subs I made were the 8n2 cap… 10n works ok, and a 1M LOG pot for the portamento.

The only thing I need to do now is figure out how to retrigger the gate from the trigger output (my ADSR's only have a gate IP)… I presume an XOR gate will do the job?

Thanks for this, fede409.

EDIT: Seem to be picking up some stray capacitance or something on the main bus. I know my contacts are clean as a whistle, but I often get stray bum notes - I'll try shielding the cables or shortening them and increasing the value of the 150pf cap… if I put my hand anywhere near the bus cable all hell breaks loose Sad
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fede409



Joined: Mar 28, 2012
Posts: 2
Location: Argentina

PostPosted: Sun Apr 06, 2014 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

AndyR1960 wrote:
Well… It's taken some time for me to do this project, but the layout works fine.

Be aware of the 2k7 1% resistor for the keyboard divider driver, as it looks like 27k on the PCB component layout. The only subs I made were the 8n2 cap… 10n works ok, and a 1M LOG pot for the portamento.

The only thing I need to do now is figure out how to retrigger the gate from the trigger output (my ADSR's only have a gate IP)… I presume an XOR gate will do the job?

Thanks for this, fede409.

EDIT: Seem to be picking up some stray capacitance or something on the main bus. I know my contacts are clean as a whistle, but I often get stray bum notes - I'll try shielding the cables or shortening them and increasing the value of the 150pf cap… if I put my hand anywhere near the bus cable all hell breaks loose Sad


Hi Andy. Some time ago I communicated with the designer. He said the design has some problems discovered time ago. For example when playing at high speed starts to failing.
It is simply an obsolete design, my apology for not notifying Embarassed
I do not know what could be the problem with the bus Sad
When I have some news about it, I will post it.
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