Nord's classical Virtual Analog Synth Nord LEAD 1/2/2x/3/4/A1 and Nord Rack versions

Re: Nord Lead 3 freezing

Postby mjbrands » 11 Jan 2013, 03:10

Last weekend I did some measurements on my Nord Rack 3. I connected my scope to the output of the 3.3V regulator and plugged a vacuum cleaner into the same outlet as the NR3. I then turned the vacuum cleaner on and off a few times and this is what I saw:

Image

The biggest swing I saw had an amplitude of 1.4 volt - that's huge on a 3.3V power line. Still, it looks worse than it is. In about a microsecond the voltage was pretty much back at 3.3V (on average) and had I measured where the 3.3V enters the main circuit board (instead of directly on the outputs of the voltage regulator) the swing would've been less. My NR3 never acted funny nor did it hang while I was doing this.

Mine isn't currently modded, but I might do it. As long as that capacitor is soldered on carefully (and correctly, mind the polarity), the mod can easily be undone. The cap itself costs like 0.15 euro.

Unless you really trust yourself, have some good soldering skills and a fine-tipped soldering iron, don't try to mod it yourself - it'll likely end in tears/frustration. Find someone who does have the skills and equipment (a soldering iron with a 3mm tip - or less). It's a 2 minute job, so if you know someone who could do it, I doubt they'd mind doing it.

Edit: what this shows is that interference on 120/230 volt might be able to reach the processors in your Nord. Ideally this interference would be filtered out (better than it is now). Where I live (the Netherlands) there isn't much interference on the mains power (which is why I had to create some with that vacuum cleaner), but it might be different in your area. I also tried plugging in the vacuum cleaner into a power socket on the other side of the room; when I did that and started turning it on and off, I wasn't even really able to see that on the output of the 3.3V regulator.
Last edited by mjbrands on 11 Jan 2013, 22:00, edited 6 times in total.
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Re: Nord Lead 3 freezing

Postby Darren » 11 Jan 2013, 12:10

Yeah, the mains in the UK is pretty filthy. I'm sure if you did the same test with the same equipment over here, your result might be a bit more concerning.
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Re: Nord Lead 3 freezing

Postby Mr_-G- » 11 Jan 2013, 21:24

Hey mjbrands, that is interesting. Have you tried using a surge protector to see what exactly they do? I read that they are "useless" and that they are a "must". Surely they can't be both... :)
The wikipedia article on surge protectors makes me wonder if we can ever know if they function or not as the light indicators are not always a reliable measure of the MOV integrity and I also wondered about the fire risk associated with these.
http://en.wikipedia.org/wiki/Surge_prot ... ifications
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