EV RE90TX wiring to 3.5mm Jack

[Bazz339]

I believe this to be an Electrovoice RE90TX Lavalier microphone which I need to re-wire to a 3.5mm stereo jack into a Sennheiser EW100 G3.

it has 3 cores and screen in the cable, red, black & white. I think (and I should know, because I wired it originally) it is red to tip and white, black and screen to sleeve.

Can anyone confirm this please, I can't find any data. T.I.A.

 

http://i1205.photobucket.com/albums/bb425/17234/Web%20Postings/20171005_2021211_zpsyryhagxv.jpg

[david.elsbury]

You'll need to find somewhere else for hosting your photos. Maybe imgur.com?

[Bazz339]

You'll need to find somewhere else for hosting your photos. Maybe imgur.com?

 

So it would seem, not had a problem with Photobucket before but not posted pictures recently. I could not get Imgur links to work on this page and am using IMgBB.

 

I believe this to be an Electrovoice RE90TX Lavalier microphone which I need to re-wire to a 3.5mm stereo jack into a Sennheiser EW100 G3. <br style="color: rgb(28, 40, 55); font-size: 13px; background-color: rgb(250, 251, 252);">it has 3 cores and screen in the cable, red, black & white. I think (and I should know, because I wired it originally) it is red to tip and white, black and screen to sleeve. <br style="color: rgb(28, 40, 55); font-size: 13px; background-color: rgb(250, 251, 252);">Can anyone confirm this please, I can't find any data.

I have now tried this and it works but the volume off the microphone is low compared to a Sennheiser MKE2. I am wondering whether either of the other wires should be connected.

 

[Simon Lewis]

The Sennheiser is wired

tip = mic input and bias voltage

ring = line input

sleeve = ground

 

To wire a mic up, the mic signal goes to tip and the shield goes to ring and sleeve.

 

To make a line input, signal goes to ring and shield goes to tip and sleeve.

 

You may have separate signal and bias lines?

 

More info here... https://sennheiseruk.happyfox.com/kb/article/104-ew-plug-pin-configuration

[Bazz339]

Thanks Simon you have confirmed what I thought about the Sennheiser input. I could do with more info on the mic head wiring. As stated using the red to tip, the gain seemed low but it might be the type of mic.

 

It certainly appears to be receiving bias voltage.

[Bazz339]

Nobody familiar with these mics?

I have red connected to tip but the level out of it is low and I wonder whether one or both of the other wires should be connected or taken to screen. The microphone has now been compared to others on site by my client and they say it is not working, I think it is but with a low output, maybe -30dB with respect to the others, I don't want sensitivity or mixer gain altered if there is still a problem with the mic wiring. I would be (mildly) surprised if the mic is actually faulty as opposed to a wiring error. I don't recall ever using the type of jack plug on the returned microphone cable, the cable had been repaired by someone else and the transmitter had ceased to function entirely so I was suspect of the wiring in the plug.

 

Looks like I may have to endure Electrovoice Technical Support which I found painful last time I tried to resolve a problem for this client.

[Bazz339]

Nobody familiar with these mics?

I have red connected to tip but the level out of it is low and I wonder whether one or both of the other wires should be connected or taken to screen. The microphone has now been compared to others on site by my client and they say it is not working, I think it is but with a low output, maybe -30dB with respect to the others, I don't want sensitivity or mixer gain altered if there is still a problem with the mic wiring. I would be (mildly) surprised if the mic is actually faulty as opposed to a wiring error. I don't recall ever using the type of jack plug on the returned microphone cable, the cable had been repaired by someone else and the transmitter had ceased to function entirely so I was suspect of the wiring in the plug.

 

Looks like I may have to endure Electrovoice Technical Support which I found painful last time I tried to resolve a problem for this client.

[sandall]

I've just looked out the wiring guide that Trantec did for their S2 beltpacks. Audio-Technica used Red for + volts & Yellow for Audio, Sony used Red & White, Shure & Tram used Red & Black, & Sennheiser MKE-2s used Red & Blue - the odd one out was EV, who used White for + volts & Red for Audio. For packs with no separate + volts Sennheiser used Red (normally + volts) for combined audio & + volts (presumably the audio is phase-reversed) & Blue & screen for ground. Might be worth trying this option, i.e. White to Tip, everything else to Sleeve.

[richardash1981]

I've just looked out the wiring guide that Trantec did for their S2 beltpacks. Audio-Technica used Red for + volts & Yellow for Audio, Sony used Red & White, Shure & Tram used Red & Black, & Sennheiser MKE-2s used Red & Blue - the odd one out was EV, who used White for + volts & Red for Audio. For packs with no separate + volts Sennheiser used Red (normally + volts) for combined audio & + volts (presumably the audio is phase-reversed) & Blue & screen for ground. Might be worth trying this option, i.e. White to Tip, everything else to Sleeve.

I can't find the document Sandall is referring to (I thought I had it somewhere), but if the mic has leads:

• white = + bias
• red = audio
• black = gnd
• screen

then I would expect to wire white and red to tip, link ring to sleeve and connect black and screen to sleeve.

 

If you are unlucky and the mic really needs separated bias and audio (e.g. has an integrated cap between white and ground), then you need a capacitor between tip and red to block the DC, and a resistor between tip and white to stop the DC loading the signal, but I've never yet encountered a microphone like this.

[sandall]

Trantec table, if it works :huh:

 

https://postimg.org/image/36hd4p76ff/

[Jivemaster]

At one time (at least) there were significant differences between "western" and Chinese standards for 1/8" TRS jack plugs and some things didn't work.

[alistermorton]

Round tip as opposed to reverse tapered IIRC or was that japanese radio earpieces?

[Bazz339]

Having had the mic returned to me with an identical one that was working it would seem red to tip, black and screen to outer, white (and ring) not connected achieved the required effect. Connecting white to either tip or outer attenuated the signal or wiped it out, however I did not try with black disconnected and white connected instead.

[richardash1981]

Having had the mic returned to me with an identical one that was working it would seem red to tip, black and screen to outer, white (and ring) not connected achieved the required effect. Connecting white to either tip or outer attenuated the signal or wiped it out, however I did not try with black disconnected and white connected instead.

Glad you got it to work! What you report does make sense if there is a capacitor between white and black:

• With it to signal, it loads the audio
• With it to ground, it shorts the capsule power out.

Quite an odd microphone design!

 

Thanks also to Sandall for the S2 wiring chart (it will work for S3.2/3.5/3500 as well), saved to my manuals folder as it isn't in the later Trantec manuals, or the old S1000 sheet I have!

[sandall]

... it isn't in the later Trantec manuals, or the old S1000 sheet I have!

It's not in the 4-page printed S2 manuals either, but one of my first S2s came with the original glossy16-page manual, which has proved very useful when sorting out how strange mics are wired.