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  1. Hi, I have an MB6582 with 4x8580 and 4x6581, and I got myself a stereo noise gate by building two MXR guitar pedal noise gate clones following the schematics on tagboardeffects (I built the stock version with the three changes mentioned in the very beginning) and boxing them up with a dual pot. (UPDATE: If you build this, I advise to use 2N5485 instead of 2N5952 as transistor Q3, as it gives clearly better results. I built a second stereo unit of these today (24.7.2014), and went with the "stock version" schematic (see link above), using a 2N5952 as specified there and believing that that was what I had built before. However my earlier unit was gating the noise much more effectively, and after a while I noticed I had built it with a 2N5485, although it was otherwise like the "unmodded stock version" [bTW at some point I built the modded mono version as well and tried it on guitar, IMO the extra controls didn't really do that much]. Changing to 2N5485 fixed the problem. I don't know why this is though. Here are the datasheets, in case someone feels like researching.. 2N5952 and 2N5485.) (UPDATE 2. March 5th, 2018. I had one more PCB for this lying around it, so I built it today and it worked without any problems. One thing I noticed was that in my screenshot below capacitors C5 and C13 are 100nF, but in the original tagboardeffects layout they're 10nF. However, I've built all mine, including the one today, with 100nF caps and haven't noticed any problems.) The two switches can be used 1) to switch between battery and adapter power (= off for battery power), and 2) to switch off the stereo input jacks' rings to use it in mono (for guitar etc). I'm not sure, but is the second switch actually redundant, as connecting a mono plug into the stereo jacks just connects the rings to ground? I put it there as a precautionary measure to avoid buzz and other problems, but then thought maybe it isn't necessary. Anyway, here's a YouTube video on how it works on a pair of 6581s: http://youtu.be/BKBQBRA9Obw
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