Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

The diyAudio First Watt M2x
The diyAudio First Watt M2x
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 15th October 2018, 11:46 AM   #691
WKCox is online now WKCox  United States
diyAudio Member
 
WKCox's Avatar
 
Join Date: Mar 2004
Location: Verona, WI
The diyAudio First Watt M2x
Quote:
Originally Posted by MEPER View Post
Where do you get "cheap" mu-metal?

It may also be possible to use mu-metal tape. I know this company sell it (but expensive). But tape may be easier to "apply":
3200 to 4700 - EMI shielding tape | Holland Shielding Systems BV

May also be possible to find it on ebay.

So the problem is that the transformer act as a "pickup" and pick up som stray fields from PSU?

Think my solution will be so isolate the M2X boards from the PSU. If hum is a general problem with this amp the building guide maybe should be updated on how to avoid it in first place?
I don't think that there is any "cheap" Mu-Metal. I paid $122 for a 2' x 4" x 0.01" piece of Mu-Metal foil from McMaster Carr.

Before the Mu-Metal shielding, I was seeing noise levels of around the 500 uV, which is the First Watt specification for the production version. After shielding, I measure around 100 uV (0.1 mV), which is quite an improvement and the limit of my test equipment.

I'm sure there will be more feedback for builders regarding shielding techniques as more people build the M2x.
Attached Images
File Type: jpg IMG_2444a_small.jpg (352.4 KB, 166 views)
__________________
Pass F5, Pass M2x, Pass ACA, Audio Research ST-70-C3, Dynaco ST-35, Audio Electronic Supply SE-1, Elekit TU-8500, Hagerman Bugle, Scan-Speak Solist MTM, Selah SA-1, Seas Loki, Cavalli eXStatA, Millett Hybrid MAX, Millett Hybrid MiniMAX
  Reply With Quote
Old 15th October 2018, 11:57 AM   #692
WKCox is online now WKCox  United States
diyAudio Member
 
WKCox's Avatar
 
Join Date: Mar 2004
Location: Verona, WI
The diyAudio First Watt M2x
One more thing: To reduce hum, try to separate the power transformer from the input transformer as far as possible. A deeper case than I used would be better to maximize the distance.
Attached Images
File Type: jpg IMG_2400a small.jpg (472.4 KB, 161 views)
__________________
Pass F5, Pass M2x, Pass ACA, Audio Research ST-70-C3, Dynaco ST-35, Audio Electronic Supply SE-1, Elekit TU-8500, Hagerman Bugle, Scan-Speak Solist MTM, Selah SA-1, Seas Loki, Cavalli eXStatA, Millett Hybrid MAX, Millett Hybrid MiniMAX

Last edited by WKCox; 15th October 2018 at 12:04 PM.
  Reply With Quote
Old 15th October 2018, 12:13 PM   #693
JSA1971 is offline JSA1971  Canada
diyAudio Member
 
Join Date: Jan 2016
Location: North Toronto
Quote:
Originally Posted by WKCox View Post
One more thing: To reduce hum, try to separate the power transformer from the input transformer as far as possible. A deeper case than I used would be better to maximize the distance.
Nice neat build! Where did you get the mounting bracket for the toroid? Or is it a DIY homemade bracket? If so, what metal did you use?

Thanks!
  Reply With Quote
Old 15th October 2018, 12:35 PM   #694
WKCox is online now WKCox  United States
diyAudio Member
 
WKCox's Avatar
 
Join Date: Mar 2004
Location: Verona, WI
The diyAudio First Watt M2x
Quote:
Originally Posted by JSA1971 View Post
Nice neat build! Where did you get the mounting bracket for the toroid? Or is it a DIY homemade bracket? If so, what metal did you use?

Thanks!
Bracket is an L-300 from Toroid Corporation. The L-300 is a good fit for the AnTek AS-3218. I have also used the L-625 L-bracket which is a good fit for the Antek AS-4218.
__________________
Pass F5, Pass M2x, Pass ACA, Audio Research ST-70-C3, Dynaco ST-35, Audio Electronic Supply SE-1, Elekit TU-8500, Hagerman Bugle, Scan-Speak Solist MTM, Selah SA-1, Seas Loki, Cavalli eXStatA, Millett Hybrid MAX, Millett Hybrid MiniMAX
  Reply With Quote
Old 15th October 2018, 01:10 PM   #695
Mark Johnson is offline Mark Johnson  United States
diyAudio Member
 
Mark Johnson's Avatar
 
Join Date: May 2011
Location: Silicon Valley
The diyAudio First Watt M2x
Default VERTICAL MOUNTING BRACKET FOR TOROIDAL TRANSFORMERS

Thank you, WKCox! Here are the sales pages for those mounting brackets:
L-Bracket from Toroid Corp

Omega-Bracket from Toroid Corp
  Reply With Quote
Old 15th October 2018, 02:25 PM   #696
JSA1971 is offline JSA1971  Canada
diyAudio Member
 
Join Date: Jan 2016
Location: North Toronto
Quote:
Originally Posted by WKCox View Post
Bracket is an L-300 from Toroid Corporation. The L-300 is a good fit for the AnTek AS-3218. I have also used the L-625 L-bracket which is a good fit for the Antek AS-4218.
Thanks WKCox! Iíve sent them an email for pricing.

Joe
  Reply With Quote
Old 15th October 2018, 02:29 PM   #697
JSA1971 is offline JSA1971  Canada
diyAudio Member
 
Join Date: Jan 2016
Location: North Toronto
Quote:
Originally Posted by Mark Johnson View Post
Thank you, WKCox! Here are the sales pages for those mounting brackets:
L-Bracket from Toroid Corp

Omega-Bracket from Toroid Corp
Thanks for the links Mark! I hadnít considered or even noticed the Omega bracket. I may consider that one instead.

Joe
  Reply With Quote
Old 15th October 2018, 02:30 PM   #698
MEPER is offline MEPER  Denmark
diyAudio Member
 
Join Date: Nov 2017
Location: Copenhagen
Quote:
Originally Posted by WKCox View Post
I don't think that there is any "cheap" Mu-Metal. I paid $122 for a 2' x 4" x 0.01" piece of Mu-Metal foil from McMaster Carr.

Before the Mu-Metal shielding, I was seeing noise levels of around the 500 uV, which is the First Watt specification for the production version. After shielding, I measure around 100 uV (0.1 mV), which is quite an improvement and the limit of my test equipment.

I'm sure there will be more feedback for builders regarding shielding techniques as more people build the M2x.


I have become a fan of having the PSU in a separate chassis. This will be my approach when building the M2X.....or any amp.
  Reply With Quote

Reply


The diyAudio First Watt M2xHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What make and model are the original drivers in Wilson Watt&Puppy 7 (WATT) aguiarrj Multi-Way 17 24th June 2017 10:39 PM
2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics Redwolf92 Tubes / Valves 12 29th October 2014 10:19 PM
diyaudio moderator vs diyaudio member Leolabs Everything Else 6 18th June 2006 08:19 AM


New To Site? Need Help?

All times are GMT. The time now is 11:09 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki