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Gear / Technical Help => Cables => Topic started by: lordbelial on January 21, 2006, 03:14:57 PM
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Hi!
Hi!
Just received an AD-20 loaned from a friend.
I would like to know how to make a cable to adapt the XLR's to a female miniplug. I know how, but I want to be sure, so I request your experience.
I would like to run these
CMC-4 (SP miniplug) --> SPSPBS1 (battery box) --> AD-20 --> NJB3 optical
I was thinking on making a 2xXLR to miniplug female adapter, so I can run the battery box behind, but I don't know how to wire the pins on the XLR, and if the "balanced" or "unbalanced" signals would matter or not.
Thanks!
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Hi!
Hi!
Just received an AD-20 loaned from a friend.
I would like to know how to make a cable to adapt the XLR's to a female miniplug. I know how, but I want to be sure, so I request your experience.
I would like to run these
CMC-4 (SP miniplug) --> SPSPBS1 (battery box) --> AD-20 --> NJB3 optical
I was thinking on making a 2xXLR to miniplug female adapter, so I can run the battery box behind, but I don't know how to wire the pins on the XLR, and if the "balanced" or "unbalanced" signals would matter or not.
Thanks!
I've made quite a few of these:
Left XLR(M): pin1 + pin3 ->shield, pin2 -> L cable
Right XLRM: pin1 + pin3 -> shield, pin 2 -> R cable
mini 3.5mm plug: shield -> sleeve , ring -> R, tip -> L
One trick I use is run a single three-wire cable into the miniplug. Then I run it to L or R XLR. Then a second wire from one XLR to the other XLR.
This is easier because I only need to get one cable into the mini 3.5mm plug. Also it takes less wire if I want a long cable, say 10 or 20'.
Richard
PS: I don't know whether to solder pin 1 or the XLR to the housing or not. I guess it doesn't hurt in this case.
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I don't know output specifics with AD-20, but preamplifiers use different balanced output schemes where sometimes grounding Pin 2 is needed (as with transformer type outputs) or Pin-2 should be left unconnected (as with some active amplifier driven outputs) where grounding pin-2 shorts out the amplifier driving that pin causing excessive amplifier power draw and heating, and this could cause problems.
Usually owner's manual helps determine which output connection scheme works for unbalanced output conversion for that model preamplifier. Calling tech support is good idea if there is any doubt.
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Ops! BIG CORRECTION TO MY POST:
I meant to say: PIN 3 (NOT SIGNAL HOT PIN 2) should maybe be grounded or NOT according to type of amplifier outptut for conversion from balanced to unbalanced output.
Another sip of coffee and the mind clears.
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Thanks men!
I've searching around to some specs on the AD-20 but I couldn't find out anything.
In the denecke home page, the only spec I could find was...
Input: Balanced 3 pin XLR at 10K
And that's all...
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Thanks men!
I've searching around to some specs on the AD-20 but I couldn't find out anything.
In the denecke home page, the only spec I could find was...
Input: Balanced 3 pin XLR at 10K
And that's all...
You are putting unbalanced into a balanced input, which is OK. Provided cables are well shielded and not that long.
Enjoy your AD20.
Richard
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Thanks men!
I've searching around to some specs on the AD-20 but I couldn't find out anything.
In the denecke home page, the only spec I could find was...
Input: Balanced 3 pin XLR at 10K
And that's all...
You are putting unbalanced into a balanced input, which is OK. Provided cables are well shielded and not that long.
Enjoy your AD20.
Richard
Thanks man!
Monday evening i'll reach the electronic store and i'll buy some XLR, mini XLR for modding the CMC-4, cables and stuff.
I'll post the resutls and the photos
anyway, I just have opened the AD-20, would you like me to see the chipsets for you? I remember that you were interested in the ADC chips.
Let me know.
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Thanks men!
I've searching around to some specs on the AD-20 but I couldn't find out anything.
In the denecke home page, the only spec I could find was...
Input: Balanced 3 pin XLR at 10K
And that's all...
You are putting unbalanced into a balanced input, which is OK. Provided cables are well shielded and not that long.
Enjoy your AD20.
Richard
Thanks man!
Monday evening i'll reach the electronic store and i'll buy some XLR, mini XLR for modding the CMC-4, cables and stuff.
I'll post the resutls and the photos
anyway, I just have opened the AD-20, would you like me to see the chipsets for you? I remember that you were interested in the ADC chips.
Let me know.
Yes, by all means, please take some pictures. I've already seen one (AudBall's), but another wouldn't hurt. IIRC the ADC is under some metal shield. If you can open easily, I'd like to see a picture of it... Also, *close ups* of the preamp section would be cool too. From what I can tell it looks like a differential transistor pair in front of an SSM2135 dual opamp. I'm curious how many opams are used and how they're wired too.
Anyway, thanks in advance for whatever you can get...
Richard
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Yes, by all means, please take some pictures. I've already seen one (AudBall's), but another wouldn't hurt. IIRC the ADC is under some metal shield. If you can open easily, I'd like to see a picture of it... Also, *close ups* of the preamp section would be cool too. From what I can tell it looks like a differential transistor pair in front of an SSM2135 dual opamp. I'm curious how many opams are used and how they're wired too.
Anyway, thanks in advance for whatever you can get...
Richard
Yep.
I opened the metal shield yesterday. I'll post the photos tonight.
See ya later
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Well... just to post some pics for my brand new cable.
Yesterday I tested the setup
CMC-4 (miniplug) -- BBox SPSPSB-1 -- Custom 2x(XLR)2miniplugfemale -- AD20 -- Optical cable -- NJB3 (wav 44.1Khz 16b)
And works great!
(http://img111.imageshack.us/img111/2442/dscn29909lz.th.jpg) (http://img111.imageshack.us/my.php?image=dscn29909lz.jpg)
(http://img460.imageshack.us/img460/8051/dscn29917al.th.jpg) (http://img460.imageshack.us/my.php?image=dscn29917al.jpg)