Linkwitz wm-61a mod preamp PCB, any comments? - diyAudio
Go Back   Home > Forums > Design & Build > Construction Tips
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Construction Tips Construction techniques and tips

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 17th May 2013, 09:15 AM   #1
mrkva is offline mrkva  Netherlands
diyAudio Member
 
Join Date: Nov 2012
Default Linkwitz wm-61a mod preamp PCB, any comments?

Hey guys,

I have designed a PCB for Linkwitz WM-61a mod preamp.
I went for a design with two gain options (x10 and x100), pseudo balanced output (hence 200ohm resistors). Also, I wanted to make it as-small-as-possible and all DIP based for easy beginners assembly.

Any comments?

Thank you!
Attached Images
File Type: png scheme.png (23.5 KB, 166 views)
File Type: png layout.png (202.9 KB, 152 views)
  Reply With Quote
Old 8th April 2016, 02:16 PM   #2
diyAudio Member
 
Join Date: Jan 2015
Hey, old thread, but I was searching for this exact thing. Did you ever make pcbs from this or find someone who makes them?

Thanks!
  Reply With Quote
Old 9th April 2016, 11:05 AM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I wonder why he has connected the junction of R1 /R11 to -9V?
Is this a version of phantom powering?
Surely this junction goes to audio ground.
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 9th April 2016, 11:26 AM   #4
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
Quote:
Originally Posted by AndrewT View Post
I wonder why he has connected the junction of R1 /R11 to -9V?
Is this a version of phantom powering?
Surely this junction goes to audio ground.
no it's correct
(the mic capsule mod, changes the FET inside it to a source follower.)
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
  Reply With Quote
Old 9th April 2016, 11:34 AM   #5
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
Quote:
Originally Posted by kaliwraith View Post
Hey, old thread, but I was searching for this exact thing. Did you ever make pcbs from this or find someone who makes them?

Thanks!
just use perfboard all the originals used perfboard.
perhaps use the PCB layout above for a parts placement/ wiring guide?
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
  Reply With Quote
Old 9th April 2016, 05:36 PM   #6
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by infinia View Post
no it's correct
(the mic capsule mod, changes the FET inside it to a source follower.)
Thanks.
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard
  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
WM-61a/Linkwitz Mod. PROBLEMS!!!! runbux Parts 13 2nd December 2013 01:49 AM
WM 61a advice for non-measurement use mrkva Parts 11 10th January 2013 12:22 PM
Problem connecting WM-61A to Monacor MPR-1 Preamp Schmeichel1 Equipment & Tools 1 18th April 2011 11:41 PM
linkwitz wm-61a mic + preamp picking up country music station natek83 Construction Tips 10 20th November 2010 01:45 AM


New To Site? Need Help?

All times are GMT. The time now is 06:37 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki