I finally did it. I added oscillator sync to my Mini.
Osc 1 as master, and either Osc 2 or Osc 3 as slaves.
Here’s what it looks like:
I didn’t have big enough shrink wrap for the doubled wires…
Here we see the two diodes. The resistors are inside the shrink wrap.
The two rather discrete toggles…
The other half of the connector, with its wires leading to the oscillators board…
Thanks to Kevin Lightner for providing the schematics for this mod, on his Synthfool site.
Cool. 
Here’s the way I did one:
If you decide to add env modulation to a slave vco, either add an opamp buffer stage or use a pot that won’t load down the vco CV summer.
I don’t remember what value pots I used, but I recall I had to try several.
Thanks Kevin. I’m not sure I want to do that yet. It took me a while to bring myself to install this mod, as discretely as possible. Now, I’m not saying it’s not tempting… But I’ve got other synths that already have those capabilities for now.
With this, I just wanted to add the possibility of having two, or more, oscillators synced together, for when I want suboscillators style sounds, for example…
Thanks for the suggestion though. 
Caongrats Alain!! That looks neat, let’s hear it
awesome! that was the reason I went Voyager vs Mini! dang! trumped! 
I bet it sounds delish!!
Thanks guys.
Actually it sounds just a tad weird. A little “dirty” (in a good way).
Here’s a short audio clip where at first there is only the master (osc 1) and one slave (osc 2) and at the end the second slave added (osc 3):
http://soundcloud.com/thealien666/minimoog-sync/s-ClGC3
EDIT: before someone asks me how did I manage to send the envelope to modulate the pitch of the slave in the first part, I didn’t. I couldn’t. I was moving the pitch knob of the slave by hand…
On a side note, except for the two toggle switches, shrink wrap, and tie-wraps, everything else, the wires, the diodes, the resistors, the connector are recycled parts. I believe in recycling, especially when it prevents me from having to buy new parts !
So I guess my Minimoog can now be classified as “environmentally friendly” too ! 
That is a dirty sound.
I’m very reluctant to have my Micro modified. It would take a lot of reflection for me to change a vintage piece it from it’s original state, but if you can do a clean job and use it musically (and it looks like you can and did), then more power to you.
I can tell by the way you write that you love your Minimoog.
I do that as well. Most of the electronics projects I make are Frankenstein creations from TV’s, VCR’s, and other bits of non-functional items that would normally end up in the dump. Sometimes I take switches from other projects I made in high school, or bits of wire from speakers or point to point wired stereos. Currently, I’m using resistors from my Farfisa organ for blinking lights behind the black acrylic multiples I’m making for my modular. 
Haha! That’s great Voltor!
The only component I thoroughly check before re-using is electrolytic capacitors. And when I say thoroughly, I mean their capacity and, more importantly, their ESR using a proper meter.
And this recycling electronics parts thing, on my part, is a spill-over from my youth, when I was discovering electronics as a hobby, and being actually too poor at the time to buy new parts.
I can relate on both accounts. I only spend maybe $200 per year on average for components. Most of it is salvage. I don’t mind buying caps, as they are relatively cheap.
I’m the opposite of you guys.
I often have to buy new parts since that’s part of synth restoration.
Here’s just the 1/4 and 1/2 watt resistors: http://www.synthfool.com/resistors.jpg (2.4m high res)
You guys would like it here.
Tons of hellboxes around filled with parts taken out of synths.
Some even new- Extras that wind up in a box instead of sorted back to where they should be.
I should sell grab bags.
