UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players

Notices

Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

Closed Thread
 
Thread Tools
Old 19th Nov 2019, 8:59 pm   #1
Tetsuo30
Retired Dormant Member
 
Join Date: Nov 2019
Location: Brussels, Belgium.
Posts: 5
Default Grundig GDM 312 microphone.

Hi, I just find an old Grundig GDM 312 microphone.
It is a din connection ... I'd like to use it on an amp with XLR or JAck connection.

There are 4 cable in the DIN : 3 pin and one solded to the DIN case.

The 3 pin are numbered 1 2 3 ... can someone explain me the wiring diagram to connect the cable to an XLR or a JACK. I can't open the microphone and doesn t know wich cable is what ...
Tetsuo30 is offline  
Old 19th Nov 2019, 9:59 pm   #2
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
Default Re: Grundig GDM 312

These mics incorporate a transformer. It's probably wired similarly to the drawing in post #9 in this thread:-

https://www.vintage-radio.net/forum/...d.php?t=101561
__________________
Graham. Forum Moderator

Reach for your meter before you reach for your soldering iron.
Station X is online now  
Old 19th Nov 2019, 11:01 pm   #3
Tetsuo30
Retired Dormant Member
 
Join Date: Nov 2019
Location: Brussels, Belgium.
Posts: 5
Default Re: Grundig GDM 312 microphone.

Thx..
So is it possible to connect it with an XLR and use it with a modern mix table? Sorry I m a newbie, I don't even understand what is dual impedance...
Tetsuo30 is offline  
Old 20th Nov 2019, 8:18 am   #4
Ted Kendall
Dekatron
 
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,657
Default Re: Grundig GDM 312 microphone.

This is a dual impedance dynamic rather than a condensor mic. I'd try connecting the wire from pin 2 to the sleeve of the jack and that from pin 1 to the tip. Alternatively, the pin 2 wire to pin 1 of the XLR and the pin 1 wire to pin 2 of the XLR. Then link pins 1 and 3 on the XLR, as the mic is unbalanced.

In either case, join the pin 2 wire to the screen of the cable.
Ted Kendall is online now  
Old 20th Nov 2019, 6:16 pm   #5
Tetsuo30
Retired Dormant Member
 
Join Date: Nov 2019
Location: Brussels, Belgium.
Posts: 5
Default Re: Grundig GDM 312 microphone.

Thank you... I'll try this this evening... So the wire of the pin 3 (DIN) stay free (not connected to XLR)?
Tetsuo30 is offline  
Old 20th Nov 2019, 7:01 pm   #6
Tetsuo30
Retired Dormant Member
 
Join Date: Nov 2019
Location: Brussels, Belgium.
Posts: 5
Default Re: Grundig GDM 312 microphone.

So
Din 1 ==> 2 xlr
Din 2 ==> 1 xlr
Din 3 ==> free unused
Cable screen ==> 1 XLr
XLR 3 ==> XLR 1

So 3 cable on XLR 1, nothing on XLR 3, and din 3 free

Exact?
Tetsuo30 is offline  
Old 20th Nov 2019, 8:35 pm   #7
Ted Kendall
Dekatron
 
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,657
Default Re: Grundig GDM 312 microphone.

Yes, that's right. The feed to 3 Din is an alternative output at a different impedance.
Ted Kendall is online now  
Old 20th Nov 2019, 8:44 pm   #8
Tetsuo30
Retired Dormant Member
 
Join Date: Nov 2019
Location: Brussels, Belgium.
Posts: 5
Default Re: Grundig GDM 312 microphone.

Thank you
Tetsuo30 is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 4:05 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.