Soundlab Mini Sync IN mod?

goab · Joined: Apr 06, 2012 Posts: 3 Location: Gothenburg

Hi folks,

This is my first post on this wonderful forum and, beware, I may be a fairly seasoned electronic musician but I'm a "have built a few noiseboxes"-beginner with the soldering iron...

I'm currently building my biggest project to date - a nanafied, patched out Soundlab Mini + a few simple stripboard additions.

I would like to replace the VCO sync switch (S9) with a banan jack to allow patching in other sync sources. Can someone confirm that this will work?

I'm assuming that the LF444/IC5 is outputting a high voltage at pin 8 per waveform cycle but I haven't gotten far enough in my electronics studies to confirm it from the schematics. Total noob, as stated. Rolling Eyes

Thanks in advance, one and all! Smile

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elmegil · Posted: Tue Jan 29, 2013 7:40 am Post subject:

I have a bunch of other stuff to do this morning so I can't check it this second, but I will get out my soundlab and confirm for you what that waveform looks like, probably sometime this evening (central US time).

I believe you're probably correct, though I'm curious what other sources you'll sync to? It would have to have audio frequencies to make much difference, so other than the LFO cranked all the way up, I can't think of anything that would be convenient for a banana. Do you have other banana synths? Otherwise you might be better off taking it to a 1/4" jack so you're sure you get grounding between the external source and the soundlab.

Also, if you are connecting to other banana synths, you probably want to bring the ground of the soundlab up to another banana so you can ground the two of them together (assuming the other one has some kind of ground connection as well). Otherwise it's not likely to work very well....

i did a couple of banana'd soundlabs last fall, if you look around the forum you should be able to find my discussions about it here.

goab · Joined: Apr 06, 2012 Posts: 3 Location: Gothenburg

Thanks Elmegil, that's very helpful!

I've got grounding and conversion to my EuroRack system covered so there's t´plenty of sync sources there! I'll also extend the soundlab with some new circuits (CGS Simple Wave Folder with it's pulse out, some basic logic modules etc.) so I think I can find enough audio rate squares to sync with.

goab · Joined: Apr 06, 2012 Posts: 3 Location: Gothenburg

I'm having one of those "should've read the documentation before asking"-moments...