From Florian Anwander Sent Sat, May 13th 2006, 12:23
From Florian Anwander Sent Sat, May 13th 2006, 12:23
Hi, I have a MS404 which has a problem with MIDI to CV conversion. The CV for the pitch and the VCF are only 0.5 Volt per Octave instead of 1.0 Volt/Octave. If there is someone who owns a MS404 and is technically enabled to do some measuring I would appreciate if he could check the voltages at pin 12 of IC15 MAX 512 (=Reference voltage for the D/A-converter) and the voltage at pin 7 of IC16 at different octaves. Positions of the chips see http://fa.utfs.org/diy/ms404/ms404-1.jpg Schematics see http://fa.utfs.org/diy/ms404/ms404-schematic-digital.jpg At my MS404 the reference voltage mesaures around 2.53 Volt. The output of O23 (IC16) reads ~0.51 Volts/Octave. Thank you very much for your help! Florian (I sent the same question to the Doepfer_a100 list, so I am sorry if some people get this message twice)