How to Wire a Patchbay: Ground Issues
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- Опубликовано: 21 окт 2024
- "How to Wire a Patchbay: Ground Issues" is a lecture video from the textbook Basic Audio Recording Techniques, taught by Mike Julian at Los Angeles Valley College. Get your copy now at www.thequimbyho...
I did pretty much exactly all these things you mentioned in the video. I was taught this method by the Rep from D&R when I bought their D&R Orion Modular In-Line console back in 1992. The only other thing I had done, by their direction, was to install a star grounding system with equal length grounding wires to all out board gear, patch bays and console, terminated in a central terminal strip and from their a heavier gauge ground wire that ran to a grounding rod that I put in my back yard. Hence, my home studio was isolated from the rest of the house. I still have that system today and works great.
There was actually one other step of lifting the grounds on one end of the audio cables, so I had soldered all those wires myself with the appropriate audio ground lifted on one end...It's a little complicated to explain here, but the system worked great...
Great video and great information you shared...
Phil
NYC Area
I'm just going to sell my patch bay, life is too short
doesn't lifting the ground off of these devices mean some danger to them if a short were to occur?
I don't know anything about anything, so take what I say with a pound of salt. You are responsible for yourself, I am not, if you follow my advice you may blow up, and burn your house/studio/structure down, killing everybody inside. With that said, I THINK that what he is saying is that each device is grounded through it's connection to the patchbay, and the patchbay is grounded to the mixer, and the mixer is grounded to the wall outlet. So, every device IS grounded, and all devices share the SAME ground, so you don't get ground loops which can cause errant noises. I have heard ground hums on many occasions over the years, like a 60hz hummmm.... but I've also heard what I call little zipper sounds, I only hear them in quality headphones, but they're very subtle, and they go zzziiiipp, kind of like a zipper being zipped up.
My question is, though, what if you draw more amps or watts than an outlet can safely handle (like 80% of its rated capacity?, I think I've heard)? Don't you need to split the load onto another circuit in the facility? So you've got 20 amps on one outlet, and 2,400 watts (both amps and watts times by 0.8 to reach 80% of actual capacity) and the same on the second outlet on a different circuit, so you can power everything without too much stress on one outlet. But this suggests you'll get ground loops, but why if both of those circuits are tied into the same ground for the facility? Isn't there still ULTIMATELY one path to ground? Or are there little variances on each of those paths on the way to the actual ground/earth caused by different resistance/capacitance or whatever of each cable, with cables of different lengths? Wish I could get some answers.
And again, don't no body listen to what I'm saying or follow my advice. I really don't know about these things.
Good info 👍
This guy has no idea what hes talking about. Clearly he doesnt know the difference between signal ground and chassis ground. DO NOT LIFT THE EARTH IN THREE PIN POWER CORD.
i think he says you put de Equipment wit the ground screws and the mixer witht e screws put them togheter on a wall with earth and earth them togehter the same you can do with your outboard when she have a eart screw . hock in up togehter an put them on the earth you have 1 earth Point in your Studio and all come on this 1 Point togehter .
This is dangerous and bad advice. Just get DI Boxes.
telling people to life their grounds. this is unsafe behaviour. completely not a good idea to be teaching this kind of thing.
Right on man. NO REASON TO DO THIS! It's ILLEGAL in most places. Also just blindly strapping all of your grounds is not a good idea... Yes, it works for some people some of the time...
You're not lifting the ground because they're grounded through the patchbay (if you do what he says).
@@chadjohnson-authormusician8072 They are grounded through an audio cable and components ... which is not meant to ground high voltage/current. When the audio ground is fried by the fault ... it will seek another path to ground ... perhaps through you.