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Midi dac voltage too high
MUFF WIGGLER Forum Index -> Oakley Sound Systems  
Author Midi dac voltage too high
punchi
Hi

Just bought a s/h Oakley Modular from Australia, and the mididac, CV output is sending too much voltage, about 2 octaves higher than my dotcom Midi/CV,

downloaded the manual, tried to calibrate the unit, but the problem is that with a C8 note from the sequencer voltage on pin 1 of IC 1, can't be adjusted to the 9 volts mentioned in the calibration procedure, the lowest it will go is 9.37 volts,

Any help/pointers/ideas will be appreciated

Cheers From Chile

Francisco Straub
Synthbuilder
punchi wrote:
Just bought a s/h Oakley Modular from Australia, and the mididac, CV output is sending too much voltage, about 2 octaves higher than my dotcom Midi/CV.

Which issue board do you have? It should be written on the circuit board as issue 1, 2, 3 or 4. The User Manual on the website is valid only for issue 4 only.

Earlier issues of the midiDAC probably may not go up as high as the dotcom system desires as they use a different variation of 1V/octave to Oakley systems. My MOTM/Oakley format VCOs are typically set two octaves higher than Dotcom. Newer VCOs can be trimmed or built to behave like a Dotcom VCO but older ones may not have the range on their tune trimmer.

For the issue 4 midiDAC to get the correct note interval then you should adjust V/oct to get -10V from note C9. Be aware though that the midi note number is not always the same on different systems - some sequencers use a different midi numbering system. I use the standard definition which means that C9 should be midi note 120.

Once this is set then you can adjust INIT to work with your Dotcom VCOs.

Tony
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