||Mystic Circuits SWITCHES expander (source files)
| br>SWITCHES kits are now available through Thonk, Synthecube and Modular Addict
Also the source files have finally been cleaned up to my liking and are now being shared on github in keeping with the Turing machine open source license. Please read the "readme" attached to understand my views on selling PCBs or units based on these designs. I want to open source all of my modules but open-sourcing new designs will be conditional on people's adherence to my vision.
Note that the Vert also uses a "Universal Front Plate" PCB for the front panel PCB. Turns out that the front plate wasn't as universal as I hoped so I probably will not build new modules based on it. Feel free to do whatever you like with it.
SWITCHES is a Turing Machine expander which turns the host module into a set of sequential/ voltage addressable/ VC switches. Four switches use an Analog Devices high speed and high accuracy switching IC and the other 4 use vactrol VCA for some 'thunk'. For more details and demos please check out the product page:
Keep in mind that the documentation has a level of detail aimed at people who have not build many kits before, so some of it may be "below your level". Either way it has some important info for even experienced builders to have a smooth build. Documentation can be found here:
A mouser cart can be found here:
Please note that the mouser cart does NOT contain everything needed to source your own parts for a build. More details for getting the rest of the parts can be found on the complete build page here:
Now that I have the main build documentation up I will most likely start working on cleaning up the schematics and releasing the eagle files necessary to build these. I hope to do this before I release the Spectra Mirror because if I don't it will be a few months out. More info on that soon.
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| br>Just thought that I would show another capability of the Switches expander that I have been messing with recently. When driven at audio rate it can produce "ring mod" frequency mixing types of sounds. Here the Switches expander is hooked up to a Vert being driven by a saw tooth wave. Source audio is from the Magic Flute. More patch details in the description.
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| br>Quick bump to notify about the sale as well as source files being available. br> br>
| br>A quick question for the electrolytics. I may have missed this in the build guide, but what capacity are those supposed to be? The larger, the better, as long as physical limits are respected?
And for the 100k resistors, those from the mouser bom are not available, but looking for replacement, I've noticed they are physically quite small, so I could use 1/4W with that size or larger 1/2W. @100k, with (unlikely) max. 24V drop, a 1/4W should be more than sufficient or am I missing something obvious?
Finally, are any issues expected with mixing vactrols? Like 2 or even 4 different kinds? Or should they be at least similarily spec'd?
P.S.: Great idea to provide visual aid for the most important measuring points. A really good example! Should make the round. br> br>
| br>1/4 or 1/2 watt are going to be gigantic, use 1/8 watt. Mamy times they are actually rated hugher but at least the size will be right. Also none of the resistirs will have a full 24V drop across them so dont worry too much about the voltage rating.
I just use 10 uF caps for the electrolytics anything at or above that should be fine.
Using different vactrols will get you a higjer chance of having different response characteristics for each input. If that doesnt matter then go right ahead. The biggest problem that I could see is if one doesnt close all the way and the others do. br> br>
| br>Thanks very much for your fast reply again. Very helpful.
|windspirit wrote: |
|Using different vactrols will get you a higjer chance of having different response characteristics for each input. |
That is the intention. For a module connected to a random source anyway this could make sense. Or fun.
Worth a try at least, since there are no electrical barriers standing against this.
I'll try to make sure, that the off resistance isn't too low to keep possible bleed to a minimum. br> br>
| br>I'm going to build 2x switches.
which vactrol I can use? (VTL5xx or NS32xx)
there are some variations, it always make me confuse, info about it are not so clear...
have you (or someone) tried some with the resistor value you suggest? any reply will be appreciated br> br>
| br>Had a couple of questions/ comments on my documentation recently. Several things:
A) One of the electrolytic capacitors is labeled backwards, please place capacitor 'C1' in the opposite direction that it is labeled. This wont break anything if your cap is backwards but the cap will go bad more quickly.
B) I just looked at the BOM and it is clearly missing a bunch of things. I had an issue awhile back where mouser was randomly deleting things from my saved projects, maybe parts are being discontinued or maybe it was just some database errors. Either way I will be looking into it and fixing it.
If you notice anything else let me know! br> br>