Balanced electret microphone circuit - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

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
Thread Tools Search this Thread
Old 30th January 2005, 04:40 PM   #1
scone is offline scone  United States
diyAudio Member
Join Date: Nov 2004
Location: Austin, TX
Default Balanced electret microphone circuit

Does anyone have experience with the Balanced electret microphone circuit found on this page ? I am planning on building a measurement mic with the panasonic WM-61A capsule, and I need to modify it to use phantom power so I can use my mixer as a preamp. I don't have any experience with electret mics, and I was wondering... are they all the same? Reason I ask is because the above link is a generic circuit with no mention of what capsules it will and will not work with.
audio projects
  Reply With Quote
Old 31st January 2005, 10:01 AM   #2
diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
one is here, I don't know how useful...
Attached Images
File Type: jpg electet2.jpg (22.8 KB, 635 views)
  Reply With Quote
Old 31st January 2005, 05:59 PM   #3
Shaun is offline Shaun  South Africa
diyAudio Member
Shaun's Avatar
Join Date: Aug 2001
Location: Cape Town, South Africa
Default This looks promising

Chek out page 100.

Shaun Onverwacht
|||||||||| DON'T PANIC ||||||||||
  Reply With Quote
Old 1st February 2005, 08:16 AM   #4
scone is offline scone  United States
diyAudio Member
Join Date: Nov 2004
Location: Austin, TX
Thanks for the responses. I've been reading about circuits that use phantom power to drive mic capsules for a while now, and the more I read, the more it makes me want to scrap the whole idea of using phantom power, and to instead stick with something really simple (battery).

I did eventually find some critique of the circuit I linked above in case anyone is interested. And I quote:
Chris' circuit puts the microphone element across the phantom powered input and uses a pair of PNP transistors running as emitter followers to drive the line. My objection to this circuit is its total dependence on the CMRR of the balanced input as neither side of the microphone element is grounded; you must replace the cable with 2C shielded twisted pair.
I doubt it would make too much of a difference, but in any case I never found anything which tells me whether or not the panasonic capsules would work well in the circuit so I'm moving on. It was originally designed as a mod to the Radio Shack PZM anyway.

So from the complicated to the simplest and it looks like Linkwitz's mod to the WM-61A capsule is about as straightforward as it gets. ( I'm planning on using his b) circuit and from what I understand, I can simply plug the output of the circuit into my pre-amp and I'm set. Someone please tell me if I'm wrong... it's very late and my brain is confused by the FET spec sheets I've been reading all night.
audio projects
  Reply With Quote


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
Electret Microphone Capsules cm961 Parts 12 6th February 2012 10:24 AM
Electret microphone question zobsky Parts 23 14th May 2011 09:22 PM
Sale the Electret condenser microphone Garyepe Vendor's Bazaar 2 12th September 2009 12:45 AM

New To Site? Need Help?

All times are GMT. The time now is 08:29 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2