ramallo Posted January 27, 2014 Report Share Posted January 27, 2014 This is my approach I added a series capacitor for phantom protection (47uF 63V) In the last image the insertion loss (Depends of the input impedance due the RC) (ups! I forgot the 1kHz notch "on") *Sorry for the ugly solder, is a recycled XLR3 Quote Link to comment Share on other sites More sharing options...
osa Posted October 8, 2014 Report Share Posted October 8, 2014 Had a shoot the other day with a Canon C300 and mistakenly plugged in my ERX before checking if phantom was engaged (I know better). I panicked and quickly turned it off. But nothing bad happened to my ERX. It still continued to operate as intended. I want to modify my existing cables I made up just to be safe. Will do better 48v police work but also wanted to help block phantom power getting switched on by mistake, etc. I bought a 10 pack of these capacitors (47uF 63V) cheap. Was just doing some bench testing prior to working with the capacitors. My mix pre D with phantom power engaged shows 44.7v at the male xlr input. When I plug a standard XLR cable, I get the same reading (just to double check). When I plug the original cable I made into the mixer (mine Y's from the 1/8 right angle trs and does not have a capacitor in series yet), the reading i get at the 1/8 connector is 0.5v. Considerably lower than a balanced XLR, but still a small amount of voltage. Voltage is 0.0v when I switch to mic or line level on the mixer. Is my Y cable not allowing the phantom power thru at full voltage because of it being wired unbalanced or some other reason I am missing? Wondering if maybe I am ok without capacitors since i have survived the last one. I do want to put them in anyways just to be safe. 1/8 TIP - to - XLR PIN 2 1/8 RING - to - BNC PIN 1/8 SLEEVE - to - XLR PIN 1, JUMPER TO PIN 3 1/8 SLEEVE - to - BNC SHELL When I wire a capacitor in series at the XLR pin 2 (as appearing in Ramallo's image), with phantom voltage on, I am still reading 0.5v. I was expecting to see 0.0v Am I assembling incorrectly somewhere along the way? Ken Quote Link to comment Share on other sites More sharing options...
studiomprd Posted October 8, 2014 Report Share Posted October 8, 2014 osa: " Is my Y cable not allowing the phantom power thru at full voltage because of it being wired unbalanced " industry standard phantom power for audio (microphones) requires balanced-floating wiring. Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 8, 2014 Report Share Posted October 8, 2014 The ERX cables I've made for others had a 3.5mm TRS plug with TC to the tip & audio to the ring. It really doesn't matter what's where as you can select it in the ERX menu. The audio is wired unbalanced as you've done and the TC is also as you've done with the TC ground connected with the audio ground at the 3.5mm sleeve connection. No resistors or caps are used. Everyone works perfectly all the time as far as I know. Quote Link to comment Share on other sites More sharing options...
osa Posted October 8, 2014 Report Share Posted October 8, 2014 Thanks Mike and Eric, good to know all around. I will quit soldering while i am ahead. google search cant find the discussion about damaged erx's from phantom power - did i dream it?? Ken Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 8, 2014 Report Share Posted October 8, 2014 Thanks Mike and Eric, good to know all around. I will quit soldering while i am ahead. google search cant find the discussion about damaged erx's from phantom power - did i dream it?? Ken There may have been a discussion but as Senator said phantom is a non issue in an unbalanced situation. Quote Link to comment Share on other sites More sharing options...
ramallo Posted October 8, 2014 Author Report Share Posted October 8, 2014 There may have been a discussion but as Senator said phantom is a non issue in an unbalanced situation. For phantom power (As senator's wrote) you need the hot and cold connected plus ground. For get +48V (With the phantom engaged) you only need any wire (hot or cold) + ground Quote Link to comment Share on other sites More sharing options...
Michael Miramontes Posted October 10, 2014 Report Share Posted October 10, 2014 The ERX cables I've made for others had a 3.5mm TRS plug with TC to the tip & audio to the ring. It really doesn't matter what's where as you can select it in the ERX menu. The audio is wired unbalanced as you've done and the TC is also as you've done with the TC ground connected with the audio ground at the 3.5mm sleeve connection. No resistors or caps are used. Everyone works perfectly all the time as far as I know. I'll vouch for this. I have 3 of Eric's cables and I've not had any problems for the past year & 1/2. Quote Link to comment Share on other sites More sharing options...
osa Posted October 10, 2014 Report Share Posted October 10, 2014 Eric is a master builder Ken Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 10, 2014 Report Share Posted October 10, 2014 I'll vouch for this. I have 3 of Eric's cables and I've not had any problems for the past year & 1/2. Oh shit now you've done it. My marketing representative will have to pay you a visit. His picture attached for your protection. Quote Link to comment Share on other sites More sharing options...
fieldmixer Posted October 12, 2014 Report Share Posted October 12, 2014 Amazing picture. Shot by a go pro Quote Link to comment Share on other sites More sharing options...
SeeKai Posted October 16, 2014 Report Share Posted October 16, 2014 For phantom power (As senator's wrote) you need the hot and cold connected plus ground. For get +48V (With the phantom engaged) you only need any wire (hot or cold) + ground In my younger days I infamously wrecked a G3 receiver by plugging it into a 48V input. That uses an unbalanced cable. The Zaxcom units, given their price tag, may have protection against this sort of thing built in. Quote Link to comment Share on other sites More sharing options...
boodschap Posted October 6, 2016 Report Share Posted October 6, 2016 I had my erx3tcd serviced, the antennaboard is replaced, does this imply it is 'protected' to phantom power? I also have a erx1, I want to make a cable with a build in protection, where do I put the capacitor? Quote Link to comment Share on other sites More sharing options...
ramallo Posted October 7, 2016 Author Report Share Posted October 7, 2016 On 6/10/2016 at 1:20 PM, boodschap said: I had my erx3tcd serviced, the antennaboard is replaced, does this imply it is 'protected' to phantom power? I also have a erx1, I want to make a cable with a build in protection, where do I put the capacitor? A capacitor in series block the DC. XLR3 pin 2 to ERX output Quote Link to comment Share on other sites More sharing options...
boodschap Posted October 9, 2016 Report Share Posted October 9, 2016 thanks man! Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted October 10, 2016 Report Share Posted October 10, 2016 There is no phantom power to or from an ERX. The TC from the tip is just line level audio (36khz sq wave), the ring outputs your program audio at line level. Both are unbalanced signals. Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted October 10, 2016 Report Share Posted October 10, 2016 30 minutes ago, Eric Toline said: There is no phantom power to or from an ERX. The TC from the tip is just line level audio (36khz sq wave), the ring outputs your program audio at line level. Both are unbalanced signals. Just to offer some geek clarification: with an ERX the time code can be output on the tip, ring, or both, with the same options for the program audio. Quote Link to comment Share on other sites More sharing options...
boodschap Posted October 12, 2016 Report Share Posted October 12, 2016 On 10-10-2016 at 4:41 AM, Eric Toline said: There is no phantom power to or from an ERX. The TC from the tip is just line level audio (36khz sq wave), the ring outputs your program audio at line level. Both are unbalanced signals. if erx is hooked up to an input set to mic + phantom, you damage your erx-output (it did happen to me). Better safe than sorry... Of course I can make another unbalanced cable, then I can workaround the phantom problem... Quote Link to comment Share on other sites More sharing options...
Frode L Hvatum Posted March 14, 2018 Report Share Posted March 14, 2018 Great thread! I am however struggling with the xlr. minijack tip goes to BNC tip minijack ring goes to xlr 2 minijack sleeve goes to ban sleeve, xlr 1 and 3 Am I doing it right? (I know, there is no phantom protection.) Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted March 14, 2018 Report Share Posted March 14, 2018 Actually, quite some time ago Zaxcom added phantom protection to the ERXs. It was maybe a third of the way into the ERX2TCD runs, but that's only a guess. 3 hours ago, Frode L Hvatum said: Great thread! I am however struggling with the xlr. minijack tip goes to BNC tip minijack ring goes to xlr 2 minijack sleeve goes to ban sleeve, xlr 1 and 3 Am I doing it right? (I know, there is no phantom protection.) You can use the tip or the ring either way as Time Code Out can choose Left, Right, or Both. Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted March 14, 2018 Report Share Posted March 14, 2018 6 hours ago, Frode L Hvatum said: Great thread! I am however struggling with the xlr. minijack tip goes to BNC tip minijack ring goes to xlr 2 minijack sleeve goes to ban sleeve, xlr 1 and 3 Am I doing it right? (I know, there is no phantom protection.) You are doing it right. The grounds for TC & audio get tied together on the 3.5mm TRS and pins 1 & 3 in the XLR are grounded together for an unbalanced audio connection. Quote Link to comment Share on other sites More sharing options...
Frode L Hvatum Posted March 15, 2018 Report Share Posted March 15, 2018 Thanks for the help! Weird. I can hear a faint whisper of the timecode, but nothing else. I tried with another minijack to phono and phono to xlr cable + phono to bnc. Worked perfectly. So the ERX is ok. So I made one from scratch and that one works perfectly. There must be a break in the cable or plug I was using. Quote Link to comment Share on other sites More sharing options...
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