lm 4563 balanced mic preamp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 28th November 2008, 09:21 PM   #1
diyAudio Member
 
Join Date: Jun 2008
Default lm 4563 balanced mic preamp

hi
is there any scheme or complet project of good (studio condenser) mic balanced preamp with lm 4562?
thanx for any information.
  Reply With Quote
Old 30th November 2008, 12:18 PM   #2
diyAudio Member
 
Join Date: Nov 2007
Location: Adelaide
The FET input LM4562 op amp would not be a good choice for a balanced microphone preamp. Noise performance tends to be the critical factor and bipolar transistors give lower noise figures than FETs for the source impedances presented by microphones. You should investigate chips that have been designed as preamplifiers for microphones by makers such as THAT Corp and Analog Devices/Texas Inst'

Two that come to mind are THAT1510 and Texas INA163
There are more specialist forums than this one dealing with this subject. One is the Prodigy Pro forum and another is http://www.picocompressorforum.com/f...wforum.php?f=1
Keith
  Reply With Quote
Old 30th November 2008, 03:33 PM   #3
diyAudio Member
 
Join Date: Dec 2007
Isn't the LM4562 BJT-input?
  Reply With Quote
Old 1st December 2008, 10:18 AM   #4
diyAudio Member
 
Join Date: Nov 2007
Location: Adelaide
Sparcnut, you seem to be right, but this is not something that NS are very helpful about. Douglas Self has it described as BJT input, and the bias current figure at 10nA seems to indicate this. What led me astray was that some owners of the Linkwitz Orion speaker were trying LM4562's in place of OPA2134 in the active crossover, perhaps bedazzled by the low distortion figures but not realising that substituting BJT input op amps in circuitry designed for FET's is not a good idea.
The remarks about choosing purpose designed op amps still apply, however.
Keith
  Reply With Quote
Old 1st December 2008, 02:56 PM   #5
diyAudio Member
 
Join Date: Jun 2008
thank you keith.i didn t know that.friends told me this chip is practicly noiseless,so i thought it will be good idea.
  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
balanced tube preamp Freddie Tubes / Valves 29 18th March 2010 09:50 AM
Preamp with balanced outputs miguel2 Chip Amps 9 5th May 2004 02:19 PM
Balanced Mic Preamp AudioFreak Solid State 14 21st July 2003 03:21 PM
balanced x-Preamp Orgonom Pass Labs 10 27th March 2003 06:45 PM


New To Site? Need Help?

All times are GMT. The time now is 01:07 AM.


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