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Ashiman

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Posts posted by Ashiman

  1. Don't you introduce some nonlinearity by using vactrols? I guess with a vactrol, all discussion about a few millivolts of DAC INL would be unneccessary.

    What I did on my SSM2044 module, that VCF is quite touchy when it comes to steppy CV (regardless of glitch noise issues, the output of a 12 bit DAC has sharp edges - the DAC is fast, the update rate on e.g. MBSID V2 is only every 2 ms, so there are hard jumps in the CV), I added a simple low pass filter on the CV input to smoothe the voltage a bit.

    S

    these linearity errors are code dependent, hence, if you notice it (?) try giving it an offset in digital realm and compensate for it in analog realm.

  2. some internal yamaha doc leaked a while ago:

    http://gendev.spritesmind.net/forum/viewtopic.php?t=386&postdays=0&postorder=asc&start=0&sid=7ee4d90fbc4cdc646826dbacfda70e52

    also notice the ym2612 is used inside the yamaha dx7 II in conjuction with a 16bit linear PCM dac, so if the YM chip can be bought theres nothing to stop us ? I checked chinese site, stock appears to be low but present. Guess they gladly source it and we dont have to fear fakes as oef yet.

    Looky:

    I will gladly support such efforts!!!

    first off:

    http://www.spoogeworld.com/music/instruments/yamaha/DX7IIFDServiceManual.pdf

  3. hi , you have to use relays or you get crosstalk. The best DMOS FET switch is like -107 crosstalk, thats clearly enough for a lot of things tho : ))

    Several sellers are in bizness @ ebay for input selector, what else you wan in hifi?

    These crosspoint switches have builtin opamps i dont lik those either.

    http://electronics.shop.ebay.com/Home-Audio-/14969/i.html?_nkw=input+selector&_catref=1&_fln=1&_sac=1&_trksid=p3286.c0.m282

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