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Post by keymod on Sept 9, 2018 5:01:26 GMT -6
And maybe back again..
How can I inexpensively convert the direct out, balanced signal of a console ( which is on a TRS jack ) to an un-balanced input on another device ( which is on a TS jack ) without negatively affecting the rest of the balanced chain?
Hosa make an adapter which goes from Female TRS to Male TS ( GPP-290 ) but I believe that simply shorts tip & ring together. Can I simply alter my balanced patch cords? Or do I need some sort of transformer in-between?
My application is with regards to the sidecar I have been working on, taking the balanced direct outs of the API 8200/8200A and using that signal for my meter bridge, which uses unbalanced inputs.
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Post by mulmany on Sept 9, 2018 7:06:40 GMT -6
Ring goes to sleeve on the TS, and you can float the ground from the DirOut. Or you tie both ring and ground together at the TS. Depends on how the equipment is grounded. Read the Jensen grounding paper.
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Post by keymod on Sept 9, 2018 9:23:42 GMT -6
Thanks. By doing this, does the original signal in the rest of the chain remain balanced? Might not matter, but curious.
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Post by mulmany on Sept 9, 2018 12:36:22 GMT -6
If you don't tie (-) to grd at the TS connection then your not directly bridging audio ground to the balenced connection. I believe you want to isolate the TS inputs on the meters from then chassis to minimize noise. Hope that makes sense.
So you cut your shield back on the TS side so that it's not making contact.
Someone correct me if I am wrong. Really the Jensen paper explains it all well.
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Post by svart on Sept 10, 2018 7:48:37 GMT -6
And maybe back again.. How can I inexpensively convert the direct out, balanced signal of a console ( which is on a TRS jack ) to an un-balanced input on another device ( which is on a TS jack ) without negatively affecting the rest of the balanced chain? Hosa make an adapter which goes from Female TRS to Male TS ( GPP-290 ) but I believe that simply shorts tip & ring together. Can I simply alter my balanced patch cords? Or do I need some sort of transformer in-between? My application is with regards to the sidecar I have been working on, taking the balanced direct outs of the API 8200/8200A and using that signal for my meter bridge, which uses unbalanced inputs. it absolutely matters what kind of output driver is on the source side. If it's a transformer, the ring needs to be grounded. If it's an opamp or other active device, you can leave the ring unconnected. Grounding it here will either cause excessive current draw, or invoke a shut-down of the output devices, which may, or may not cause issues. |
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Post by svart on Sept 10, 2018 7:54:06 GMT -6
Thanks. By doing this, does the original signal in the rest of the chain remain balanced? Might not matter, but curious. Balanced is short for "impedance balanced". The term for a pair of signals, one of which is inverted in polarity, is "differential". Balanced doesn't necessarily mean that it's also differential. Balanced simply means that there is a current return conductor with the same impedance as the signal wire. But to answer your question directly, both the balanced and differential actions are on a per-case basis. You can have a section of conductor that does not have either (called single-ended), and yet you can have balanced/differential connections elsewhere. You simply lose the benefit of either for that section of conductor, and might incur noise ingress or something. |
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Post by stratboy on Oct 3, 2018 12:16:07 GMT -6
The Jensen paper is a very good technical explanation. Here is a very good non-technical paper on the subject, with drawings that show how to properly wire up most of the variations you typically encounter. www.rane.com/note110.htmlAlso, DIYRE makes simple little balanced to/from unbalanced kits that make it easy to use active circuitry to go whichever direction you want. Here’s a link to the balanced input kit ($15). The output kit is out of stock right now. www.diyrecordingequipment.com/collections/all-products/products/balanced-input |
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