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 14th June 2019, 10:18 PM   #2161
Nelson Pass is offline Nelson Pass  United States
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
The diyAudio First Watt M2x
Quote:
Originally Posted by MEPER View Post
….I wonder who made the shielding case for the Edcor…..
Me, with my own two hands.....
  Reply With Quote
Old Yesterday, 07:11 AM   #2162
MEPER is offline MEPER  Denmark
diyAudio Member
 
MEPER's Avatar
 
Join Date: Nov 2017
Location: Copenhagen
Quote:
Originally Posted by Nelson Pass View Post
Me, with my own two hands.....


Ok....you made a small template to cut the mu-metal from?
Can you remember how much it dampened the 60/120 Hz noise?


The input circuit with the jfets you used fixed resistor values. Did you do any fine tuning to get zero DC offset and/or fine tuning to a specific distortion profile (like we do in BA3-pre using P3)? …..your input circuit was DC coupled to Edcor?


Something I wondered when looking at the amp boards from 6moons review. There is a single resistor at the far end from input. Why is he sitting so alone and isolated from the others?
  Reply With Quote
Old Yesterday, 07:23 AM   #2163
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
The diyAudio First Watt M2x
LED
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old Yesterday, 07:36 AM   #2164
MEPER is offline MEPER  Denmark
diyAudio Member
 
MEPER's Avatar
 
Join Date: Nov 2017
Location: Copenhagen
Of course…….the blue LEDs…...
  Reply With Quote
Old Yesterday, 08:31 AM   #2165
maty tinman is offline maty tinman  Spain
diyAudio Member
 
maty tinman's Avatar
 
Join Date: Apr 2012
Location: Tarragona (Spain)
Quote:
Originally Posted by MEPER View Post
Nice copper shield and build!
Copper shield is more to shield against RF than magnetic induced noise?
It could be interesting to "just" change copper shield to mu-metal shield and then make the same measurements to see if it would lower the 60/120 Hz noise.
The diyAudio First Watt M2x

The diyAudio First Watt M2x

The diyAudio First Watt M2x
__________________
"Comment is free, but facts are sacred" - C. P. Scott *** 40 years of the Spanish Constitution, My musical celebration
  Reply With Quote
Old Yesterday, 09:20 AM   #2166
MEPER is offline MEPER  Denmark
diyAudio Member
 
MEPER's Avatar
 
Join Date: Nov 2017
Location: Copenhagen
Ok.....I use a 500VA Toroid for each mono block. This ensure that flux will stay inside the core as toriods are hugely over dimensioned. Then it has a two layer special steel band around it to shield it (from DonAudio). Then toroid is placed a far as possible from Edcor in the chassis. So......so far so good. I look forward to see the results. Edcor has both copper tape and mu-metal around it. If this is not enough a mu-metal case can be made to put around it also. I like the mu-metal band around it as this also protects the backside of Edcor. A case only protects the top.
  Reply With Quote
Old Yesterday, 09:30 AM   #2167
MEPER is offline MEPER  Denmark
diyAudio Member
 
MEPER's Avatar
 
Join Date: Nov 2017
Location: Copenhagen
In my design I ensured to have short wires from transformer outputs to diodes as these wires radiates a lot of noise as there are large peak currents to charge the capacitors through the diodes. Maybe the choice of schottky diodes helps a little here?
I hope "my thinkings" will benefit at the end.....we will see…..
  Reply With Quote
Old Yesterday, 10:18 AM   #2168
MEPER is offline MEPER  Denmark
diyAudio Member
 
MEPER's Avatar
 
Join Date: Nov 2017
Location: Copenhagen
There is a picture here that shows how current looks like in a full rectifier circuit. Yellow is the current. These current peaks looks "nasty" as they rise very fast so they can couple capacitive with other circuits that are close to the wires that are connected to the rectifier. Wrapped around the Edcor would not be good :-)

I wonder how high frequency these wires can radiate. If there are also RF noise from these wires caused by the fast rise of current?
Attached Images
File Type: png ANypn.png (5.9 KB, 68 views)
  Reply With Quote
Old Yesterday, 10:27 AM   #2169
maty tinman is offline maty tinman  Spain
diyAudio Member
 
maty tinman's Avatar
 
Join Date: Apr 2012
Location: Tarragona (Spain)
I have long defended, unsuccessfully, the use of star quad cables also in the internal wiring. Especially for Class D amplification and preamps, phono, dac .... but people prefer the twisted of all life. Also aluminum boxes with thin walls is usual but not for the best.
__________________
"Comment is free, but facts are sacred" - C. P. Scott *** 40 years of the Spanish Constitution, My musical celebration
  Reply With Quote
Old Yesterday, 10:49 AM   #2170
MEPER is offline MEPER  Denmark
diyAudio Member
 
MEPER's Avatar
 
Join Date: Nov 2017
Location: Copenhagen
Star quad cable…….had to look that up. Used a lot as microphone cable it seems. That would require some preparation to use it as PSU wiring. Screened wires always takes a bit longer......would also require large dimension and it will be thick…...it will not be this time :-)
Attached Images
File Type: jpg 54967_2_sq.jpg (40.4 KB, 62 views)
  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 03:19 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki