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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Single Buss Keyboard Conroller
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El Mop



Joined: Aug 20, 2012
Posts: 56
Location: Germany

PostPosted: Tue Oct 30, 2012 9:57 am    Post subject: Single Buss Keyboard Conroller Reply with quote  Mark this post and the followings unread

Hi,
I did a layout of the Single Buss Controller from the MFOS Site
http://www.musicfromouterspace.com/analogsynth_new/SINGLEBUSSKEYBOARD2007/schematicpage1.gif

Here is my layout :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

(The numbers at the beginning of the Bill of Material are resistors. Just using only numbers for a better readabilty in the layout.
I used a TL074 instead of the LF444. All diodes are 1N4148.)
Edit: Q1 need to be turned by 180 degrees.


I checked it three times and couldnĀ“t find a mistake,
but today I connected it to the resistor chain to calibrate it
and couldnĀ“t get anywhere near the 0.3959V.
Instead I get voltages from 2.8V till 3.52V, depending on the adjustment of the Trim Pot R3.
Help please!!!
Thank you!!!
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aletropot



Joined: Jun 10, 2012
Posts: 33
Location: Amsterdam

PostPosted: Wed Nov 14, 2012 2:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

hum...
I was reading the calibration, and you need to get 0.833A on R5. I have this value..
But then I check the voltage and I have 2.3V too and not the 0.39Vs...
Confused
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