POWERING AKG C411 CONDENSER MIC - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th November 2010, 12:33 AM   #1
teleman is offline teleman  Norway
diyAudio Member
 
Join Date: Jul 2008
Talking POWERING AKG C411 CONDENSER MIC



Hi,
I have an AKG C411L condenser contact mic,but without the power pack.So now I've built this simple buffer to power & boost the signal as well.

When I connected the C411L to it,although the mic is working,the circuit is "motorboating .The buffer works otherwise just fine with other back electret mics like Panasonic WM61 etc.I have no idea why this mic is behaving this way! Buying a power pack is out of the question,as I think it is unreasonably expensive!

The buffer is running on +/-12v dc , proper psu & the load resistor feeding the mic is 15k

As you will notice,in the original wiring, both pins 2 & 3 are tied to the mic "hot"! wire.

This is my modified wiring
Pin 1 screen
Pin 2 blue to buffer input
Pin 3 red to the 15k supply resistor.

Can anyone please tell me what I've done wrong here?
Thanks.
Attached Images
File Type: jpg AKG C411L.jpg (9.1 KB, 83 views)
File Type: jpg MIC PREAMP.JPG (154.7 KB, 82 views)
Attached Files
File Type: pdf C4114055d1f49698a.pdf (115.8 KB, 26 views)

Last edited by teleman; 11th November 2010 at 12:41 AM.
  Reply With Quote
Old 13th November 2010, 09:27 PM   #2
mjf is offline mjf  Austria
diyAudio Member
 
Join Date: Jan 2009
Location: Austria
hello.
i am no mic expert.but i saw a few older versions of akg headsets.the input configuration was:
instead of 15k there was 8,2k..........perhaps you will use 10k - similar to the attached schematic.
4,7k left out,none.
8,2k behind the input cap..........here 10k,not far away.
i guess the motorboating will not stop,but perhaps try it out.
greetings
  Reply With Quote
Old 13th November 2010, 10:39 PM   #3
teleman is offline teleman  Norway
diyAudio Member
 
Join Date: Jul 2008
Hi mjf,
Good to hear from you again! I will of course try your suggestion in the morning & will report back.What puzzles me is that the recommended input impedance value for this C411 mic is > 1k ohm!

So do you think making the buffer to an inverting input instead will be any good?

Cheers
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Condenser microphone capsule for AKG-NEUMANN stevenHK Vendor's Bazaar 3 20th August 2010 09:06 PM
phantom power for condenser mic patknk939 Everything Else 5 21st September 2008 07:07 PM
'Tube' preamp bad for measurement mic? also Apex mic question morbo Multi-Way 10 23rd March 2005 10:19 AM
AKG k-1000 re-wiring rstek Analogue Source 0 4th October 2003 03:58 PM
AKG 340 johnp Solid State 1 25th February 2001 12:03 AM


New To Site? Need Help?

All times are GMT. The time now is 03:06 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2