Using Heil Goldline Mic with Android Phone

[KE5KZX]

I know this isn't strictly an amateur radio question, but I thought I'd ask anyway.

I'm trying to adapt my Heil Goldline mic for use with my Samsung Exhibit 4G Android phone, so I bought a 3.5mm PRRS plug with three discrete shielded stripped end cables (White=Pin, Yellow=Ring 1, Red=Sleeve), a PRS inline jack, and a female four-pin XLR mic connector.

Using the Samsung PRRS pinout of P=Left Audio, R1=Right Audio, R2=Ground, and S=Mic, I soldered the shields of White and Yellow to the sleeve of the PRS jack, White to the pin and Yellow to the ring. My stereo headphones work perfectly with this arrangement.

I then soldered the shield of Red to ground and Pin 1 of the XLR and Red to Pin 2 (per Bob Heil). I then successfully tested all connections from the PRRS plug to the PRS jack and the XLR connector with an ohmmeter.

When everything is connected, the headphones still work the same but the phone doesn't "hear" the external mic or disable the internal mic like it does with the headset that came with the phone.

What am I doing wrong? Any ideas?

Thanks!

Dennis KE5KZX

[W9GB]

I would have to spend time with your Samsung Android (Galaxy S) phone specs,
but it may have voltage on Microphone Line for an Elecret mic element.
TRS Connector
http://en.wikipedia.org/wiki/TRS_connector

TRRS Splitter
http://www.startech.com/Cables/Audio...emale~MUYHSMFF

The Heil Goldline is a standard dynamic mic element.

I see you have question on Android forums.
http://androidforums.com/samsung-exh...icrophone.html

w9gb

[KE5KZX]

W9GB,

Thanks for getting back to me.

I measure no voltage on the mic line (measured from Pin 1 and Pin 2 on the XLR with the PRRS plugged into the phone). I also wondered about the dynamic/electret difference regarding voltage to the element.

I looked at the Startech splitter, and it describes a PRRS plug split to two PRS jacks. This is essentially what I have done with the PRRS plug to PRS jack for the headphones, and that part works.

Since the other PRS jack on the Startech splitter (for the microphone) obviously has three connectors and I only have two connections to the XLR (Pin 1/Ground and Pin 2), is it possible that a third connection to the XLR is needed?

BTW, I think the people on the Android forums are pretty clueless regarding hardware, so I don't expect any help from that quarter.

Thanks again!

Dennis - KE5KZX

[G0VHS]

Apologies, just typed a response, and saw that the electret/dynamic discussion was already underway!

That's my suggestion, try an electret.

[K6LCS]

I found what I needed for a 3rd gen and 4th gen iPod touch as fat as XLR adapters at ...

http://www.kvconnection.com/

Clint K6LCS