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Low Earth Orbit
DIY Audio
Line Level Isolation Transformers
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<blockquote data-quote="Geoff Doane" data-source="post: 49348" data-attributes="member: 1155"><p>Re: Line Level Isolation Transformers</p><p></p><p></p><p></p><p>I have to admit that I didn't know exactly what AES48 was, but after I Googled it, I see it's the official name for the solution to the "Pin 1 problem".</p><p></p><p>I'm not sure that it applies in this case, since the box is passive (AES48 seems to be for active devices). I suppose I could connect pin 1 directly to the chassis (the essence of AES48, I think), but that might inadvertently cause a ground loop if the chassis was touching another piece of equipment. It also could cause a problem if the transformer was used in reverse (think using it in line with snake "sends" rather than "returns", even if it is a return feed, so the gender is reversed).</p><p></p><p>Commercially available snakes almost always just float the stage box. The only exception I can think of is the Canare line, which has a separate drain wire for the boxes, although I'm not sure what you're supposed to do with that drain wire at the fan end of the snake. Of course in an installation, any raceways (conduits, junction boxes) are supposed to be bonded to ground by electrical code.</p><p></p><p>The transformers would typically be used when a pin 1 problem does exist, and only after a hum has been discovered. I see them being useful when attempting to interface my system with a house rig of questionable integrity.</p><p></p><p>Would you have an alternate suggestion? I'm interested in hearing all the pros and cons I can on this subject.</p><p></p><p>GTD</p></blockquote><p></p>
[QUOTE="Geoff Doane, post: 49348, member: 1155"] Re: Line Level Isolation Transformers I have to admit that I didn't know exactly what AES48 was, but after I Googled it, I see it's the official name for the solution to the "Pin 1 problem". I'm not sure that it applies in this case, since the box is passive (AES48 seems to be for active devices). I suppose I could connect pin 1 directly to the chassis (the essence of AES48, I think), but that might inadvertently cause a ground loop if the chassis was touching another piece of equipment. It also could cause a problem if the transformer was used in reverse (think using it in line with snake "sends" rather than "returns", even if it is a return feed, so the gender is reversed). Commercially available snakes almost always just float the stage box. The only exception I can think of is the Canare line, which has a separate drain wire for the boxes, although I'm not sure what you're supposed to do with that drain wire at the fan end of the snake. Of course in an installation, any raceways (conduits, junction boxes) are supposed to be bonded to ground by electrical code. The transformers would typically be used when a pin 1 problem does exist, and only after a hum has been discovered. I see them being useful when attempting to interface my system with a house rig of questionable integrity. Would you have an alternate suggestion? I'm interested in hearing all the pros and cons I can on this subject. GTD [/QUOTE]
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