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Post by Johnkenn on Jan 3, 2024 15:15:33 GMT -6
And explain it to me like I’m a five year old…
Could I take one of my older spdif cables, cut one end off and attach an XLR-F? Make it 18” or so
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ericn
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Balance Engineer
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Post by ericn on Jan 3, 2024 16:10:52 GMT -6
And explain it to me like I’m a five year old… Could I take one of my older spdif cables, cut one end off and attach an XLR-F? Make it 18” or so Yeah I know a bunch of people who used cheap HOSA audio cables for this, from memory pin 1 & 3 on the XLR are tied together on the RCA ground. However all the diagrams I can find on line have about 3 resistors. If it doesn’t work it’s not like you’re going to blow something up |
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Post by Bob Olhsson on Jan 3, 2024 19:35:26 GMT -6
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Post by doubledog on Jan 3, 2024 19:55:04 GMT -6
you don't need a transformer - that would be used for much longer runs over 75 ohm coax, etc. Your 18" cable won't care. But still use some decent quality mic cable.
You are going to wire it just like an XLR to TS cable except that instead of a TS, it's an RCA jack...
{wrong picture}
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Post by Bob Olhsson on Jan 3, 2024 21:12:11 GMT -6
Why would you short 2 & 3?
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ericn
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Post by ericn on Jan 3, 2024 21:26:25 GMT -6
Why would you short 2 & 3? Yeah it should be 1 & 3, 2 should be hot. |
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Post by seawell on Jan 3, 2024 21:29:08 GMT -6
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ericn
Temp
Balance Engineer
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Post by ericn on Jan 3, 2024 21:55:33 GMT -6
Transformers, one for each direction for long cable runs. |
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Post by svart on Jan 4, 2024 8:17:32 GMT -6
you don't need a transformer - that would be used for much longer runs over 75 ohm coax, etc. Your 18" cable won't care. But still use some decent quality mic cable. You are going to wire it just like an XLR to TS cable except that instead of a TS, it's an RCA jack...  I'm sorry but this is not correct. AES from an XLR is still differential, so wiring pins 2 and 3 together would effectively null out the signal at best and probably overstress the driver (FRY IT) at worst. The most simple thing to do would be to wire PIN 2 from the XLR to the CENTER PIN of the RCA. Then wire PIN 1 of the XLR to the SHELL of the RCA. Leave PIN 3 of the XLR unconnected. This ignores the impedance difference, but for a short cable of a few feet or less, this won't matter much. An off-the-shelf AES(XLR) to SPDIF(RCA) cable will have a resistor divider network built in to adjust the impedance from 110 to 75 ohms. |
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Post by svart on Jan 4, 2024 8:20:23 GMT -6
This would be the more correct way to do it:  |
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Post by bluesholyman on Jan 4, 2024 8:40:29 GMT -6
If you are interested is a good article on it, see HERE |
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Post by thehightenor on Jan 4, 2024 8:46:54 GMT -6
If you quickly download the RME Multiface PDF manual - there is the wiring diagram to make your own spdif to AES. I made a few up and they work perfectly. I used 110 ohm canble. Here you are - go to Page 41archiv.rme-audio.de/download/mface_e.pdf |
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Post by doubledog on Jan 4, 2024 9:43:34 GMT -6
yeah, sorry guys, that was totally wrong. I meant to grab a picture that had 1 & 3 to ground - which is usually how an XLR to TS is built. I looked at a bunch and grabbed one that was clearly drawn, but it was wrong - I don't know WTF that graphic was for...  Maybe the only way to know how the Lynx cable is built is to disassemble the XLR and see if it has resistors or is just straight through? I'm sure either way would work for an 18" cable. |
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Post by Johnkenn on Jan 4, 2024 10:09:59 GMT -6
Live look at me using @doubledogs diagram…  |
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Post by Johnkenn on Jan 4, 2024 10:11:59 GMT -6
I just ordered one because doing it myself was kind of a funny joke anyway
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Post by tkaitkai on Jan 4, 2024 16:19:20 GMT -6
I have one of these for AES out of my Lavry AD to SPDIF optical in on my Apogee interface. Works like a charm. |
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Post by Johnkenn on Jan 4, 2024 18:49:27 GMT -6
I remembered I had one of these that I bought like 15 years ago and never used. And yes, I tried to sell it, but no one bought it lol. (Only reason anything stays with me)
Went and dug around and found it...and it was AES to SPDIF Optical. Whomp.
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timix
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Post by timix on Jan 5, 2024 0:30:03 GMT -6
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Post by seawell on Jan 5, 2024 6:59:43 GMT -6
Ok cool, what is it bringing to the table over the lynx cable? Does it matter if it’s a short run cable? I’ve owned one for years by the way, just haven’t had the need to use it in a long time so this thread got me thinking of it. |
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Post by svart on Jan 5, 2024 7:40:35 GMT -6
Ok cool, what is it bringing to the table over the lynx cable? Does it matter if it’s a short run cable? I’ve owned one for years by the way, just haven’t had the need to use it in a long time so this thread got me thinking of it. Looks like the selling points are: Bi-directional Actively buffered for long cables I think if you're just going AES->SPDIF then the cheap conversion cable would be fine. AES spec has a higher voltage, so the signal loss going to SPDIF wouldn't matter much if you're going by the spec. However, like i've mentioned, almost ALL transceivers for AES and SPDIF are the same parts. You simply set a bit to tell it whether or not it should decode the extra AES payloads. The interface voltage and impedance is usually set with a few resistors in a divider network since the IC input is going to be high impedance anyway. The input will have a trigger threshold in volts. Anything below this is ignored, anything above it is considered a 1. It won't care one bit (pun intended) about what the absolute voltage is as long as the threshold is (not)met. Also, AES3 is 110 ohm and differential over XLR. AES-ID is 75 ohm over RCA just like SPDIF. |
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