via AndyR1960 on electro-music.com, posted July 24 2012. See the thread for updates.
"Sorry it's taken so long, but here's the single Eurorack version of the Odyssey MkII/III VCO. I've just posted this in a previous ARP VCO thread, but to save time wading through 13 pages, I thought it would be easier to post it here.
I've built several (5!) and have had no problems with them except that, when I mount them in my grounded rack, the pitch drops about half a semitone!!! Still not sure what's causing this, but once it's in the rack and tuned up, it's perfectly fine.
Again, like the dual version, the FM inputs are "floating" (the Odyssey always has a voltage at the FM input) so please make sure that the input pot is always counter clockwise when not in use, otherwise you will encounter scaling problems.
OK, I'll admit it's a bit of a hack, but it works.
I'm not releasing the 2600 VCO/Waveshaper yet as:
a) It's already been posted here
b) Too many kludges in the pulse width pot wiring (ie. messy!)
The schematic can be found via Google (ARP Service Manual), and please remember that I'm just an enthusiast, with no formal electronics training... so if there's a problem, I may not be able to help... but I'll try
Hope you find it useful.
Oh... and before I forget. The Ring Mod is NOT included on this board, but a 0-10v Square Wave output is provided to feed the ARP's XOR Ring Mod (I'm working on it, and I'll post ASAP), but it's a simple circuit that can be built on strip board fairly easily."
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