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 Forum index » DIY Hardware and Software » YuSynth
CV Standard
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Omega



Joined: Oct 11, 2010
Posts: 15
Location: Böblingen

PostPosted: Sun May 20, 2012 8:19 am    Post subject: CV Standard
Subject description: voltage differences
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Hello everyone,

I am just working with the CV Standard and have a question on the voltages, if these are correct enough.
What I've done so far was to select the 200K resistors. All 9 are between 199,64K and 199,68K. The 6 * 100K resistors are between 99,62K and 99,66K.
When I now measure the voltage at the 3 outputs there are still some differences. My question now is: are these differences o.k. or should I investigate more in the differences? Putting Semitones to 5 (= 0) and Octaves to 0 it was a bit difficult to adjust the voltage to nearly 0mV regarding the trimmer T24, T26 and T28. A small amount of turn will have a jump of about until 0,3 mV. So I tried to be as careful as I could be to adjust to 0mV +/- 0,2mV.
Now I put the Octave switches to 1V and I measure the voltages at the appropriate outputs. After that I select the other voltages. Here are the results:

Volts: 0
Out1: 0,12mV
Out2: 3,64mV
Out3: 0,07mV

Volts: 1
Out1: 0,9997V
Out2: 0,9998V
Out3: 0,9993V

Volts: 2
Out1: 1,998V
Out2: 2,000V
Out3: 1,999V

Volts: 3
Out1: 3,003V
Out2: 3,004V
Out3: 3,004V

Volts: 4
Out1: 4,004V
Out2: 4,004V
Out3: 4,005V

Volts: 5
Out1: 5,003V
Out2: 5,003V
Out3: 5,003V

Volts: 6
Out1: 6,004V
Out2: 6,003V
Out3: 6,004V

Volts: 7
Out1: 7,005V
Out2: 7,003V
Out3: 7,003V

Volts: 8
Out1: 8,004V
Out2: 8,001V
Out3: 8,002V

Volts: 9
Out1: 9,005V
Out2: 9,002V
Out3: 9,003V

Volts: 10
Out1: 10,006V
Out2: 10,001V
Out3: 10,002V

maybe someone can tell me, if these values are o.k. This would be very nice.

Many thanks in advance


Bernhard
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yusynth



Joined: Nov 24, 2005
Posts: 1221
Location: France

PostPosted: Sun May 20, 2012 1:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes they are very good, the maximum error is less than 0.3% which is excellent.

the worst case (3mV) is roughly 4 cents of a semi-tone.

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Yves
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Omega



Joined: Oct 11, 2010
Posts: 15
Location: Böblingen

PostPosted: Sun May 20, 2012 8:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you very much for the fast reply, Yves. So I am happy with my measurements. Very Happy
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Bernhard
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