Hi
The first picture is of the finished effort. The second picture shows my pulling aside the NooElec cap on the Edcor and the third shows the narrower NooElec piece of the sheet that I wrapped around the Edcor coil. The first picture worked best. I cut a piece of the NooElec sheet a bit larger than the transformer, taped around the four edges (black tape) so that there would be no metal contact anywhere. I hope it's clear. the dimensions of the sheet were 8" x 10.5" x .004"and the composition of the sheet is 80.3% Nickel, 14.3% Iron and 5.4% Molybdemon. Hope that helps.
The first picture is of the finished effort. The second picture shows my pulling aside the NooElec cap on the Edcor and the third shows the narrower NooElec piece of the sheet that I wrapped around the Edcor coil. The first picture worked best. I cut a piece of the NooElec sheet a bit larger than the transformer, taped around the four edges (black tape) so that there would be no metal contact anywhere. I hope it's clear. the dimensions of the sheet were 8" x 10.5" x .004"and the composition of the sheet is 80.3% Nickel, 14.3% Iron and 5.4% Molybdemon. Hope that helps.
Attachments
Is NooElec a conducting tape (I look at picture 3)?
In that case I don't think it should be wrapped around the windings (inside the core) as it will short the transformer (depending on how conductive NooElec is.....and if you have overlap to make a full winding). It is better to have it around the Edcor on the outside of winding and core? Like a flux-band. Like it is showed here:
Transformers Part 2 - Beginners' Guide to Electronics
About 2/3 down……..where he use copper. The flux-band is to prevent the transformer to send noise out but it is just to show how a full winding around an EI-core transformer can be applied without making a shorted winding. Since your M2X is playing music…...you are probably ok....
In that case I don't think it should be wrapped around the windings (inside the core) as it will short the transformer (depending on how conductive NooElec is.....and if you have overlap to make a full winding). It is better to have it around the Edcor on the outside of winding and core? Like a flux-band. Like it is showed here:
Transformers Part 2 - Beginners' Guide to Electronics
About 2/3 down……..where he use copper. The flux-band is to prevent the transformer to send noise out but it is just to show how a full winding around an EI-core transformer can be applied without making a shorted winding. Since your M2X is playing music…...you are probably ok....
The final image in my post a few pages back shows how I wrapped my edcors, I later added a box around them too. I have zero hum.
.. dB
.. dB
The first time I built a small box to place over the entire edcor and I did short it. So I then wrapped tape around all four sides and did not remove the paper backing so there is no metal contact. For the coil I cut a piece of the NooElec just as narrow as the coil and covered it with tape on all sides, long enough to overlap. I probably got that idea from dBel84. Unlike him, I do have slight hum. But the amp is playing beautifully. Be interested in your implementation. And thanks for the link. A while since I looked at that site.
MEPER, I tend to agree. My own plan is to wrap the transformer like Edcor does with some of their products, using application-specific copper tape on the exterior (i.e., belly band or flux band per your link). Then, build a box with mu metal to encase the entire transformer. I'll line the interior of the box with Kapton tape. The main effect I expect to come from the box. And of course careful positioning/rotation of the power transformer.
BK
BK
My plan it to first apply copper tape around it and after that mu-metal tape (like a double flux band). Then I am sure to have magnetic shielding at the backside of the Edcor after it is installed. Then I check for hum when the amp is built and if no hum I stay with that. If stil hum I will built a mu-metal box. Now I know I have to take care when building the PSU. I have got some magnetic shielding for the toroid trafoes (steel based) and I plan for mono blocks. Doing that the PSU can be placed a good distance from the amp board. I have asked HiFi 2000 shop if they can make the Deluxe 5U back panel in a mono block design like moving the hole for the IEC connector to one side and only make hole for one RCA input but still have 4 x speaker outputs which is nice for bi-wiring. I just ordered two sets of connectors from DiyStore. On top of that I also ordered Mosfets for the F5 (think it was). They use same MosFets as M2 and it seems I get them paired that way….even that it is not necessary for M2. There are some small signal transistors in the set also…..which I don't use but they are probably cheap.
M2X experience
Good evening M2X - builders,
this afternoon I made my covers for the EDCORs. Material is raw copper
in 1mm thickness.
Cutting the copper sheets, bending, soldering, grinding/sanding and some
polish.
I had fun?!.....
I am still waiting for delivery of the MU-Permalloy-foil. will cover the inside
of the copper-covers with the MU-foil.
Not finished. Story will continue...
Greets
Dirk
Good evening M2X - builders,
this afternoon I made my covers for the EDCORs. Material is raw copper
in 1mm thickness.
Cutting the copper sheets, bending, soldering, grinding/sanding and some
polish.
I had fun?!.....
I am still waiting for delivery of the MU-Permalloy-foil. will cover the inside
of the copper-covers with the MU-foil.
Not finished. Story will continue...
Greets
Dirk
Attachments
answer to dBel84
Hello dBel84,
this video would bore your pants off! Watching a crazy man in complete
concentration - short before freaking out...
Would be like the 3 version of 'Psycho'...
Oh mother, all is soldered, sanded and full of blood...
Sure, it's a joke. But was a little bit hard for my nerves and patience.
Greets
Dirk
Hello dBel84,
this video would bore your pants off! Watching a crazy man in complete
concentration - short before freaking out...
Would be like the 3 version of 'Psycho'...
Oh mother, all is soldered, sanded and full of blood...
Sure, it's a joke. But was a little bit hard for my nerves and patience.
Greets
Dirk
Great looking soldered boxes! I can only imagine how tedious that was to execute.
Since we are going to great lengths, what about the bottom of the transformer? Some insulated mu metal on the top of the PCB under the transformer? Don't know how much it really matters here, but the "best" shielded transformers seem to be fully boxed in or encased.
BK
Since we are going to great lengths, what about the bottom of the transformer? Some insulated mu metal on the top of the PCB under the transformer? Don't know how much it really matters here, but the "best" shielded transformers seem to be fully boxed in or encased.
BK
answer to bk856er
Hello bk856er,
that was one of the main problems I was thinking about too. How can we cover the underside of the EDCOR or the pcb?
I was also thinking about covering the complete pcb. But that would cause too
much heat in there.
Place a sheet of MU-foil to the underside of the pcb? Danger of short at the
solderpoints.
Greets
Dirk
Hello bk856er,
that was one of the main problems I was thinking about too. How can we cover the underside of the EDCOR or the pcb?
I was also thinking about covering the complete pcb. But that would cause too
much heat in there.
Place a sheet of MU-foil to the underside of the pcb? Danger of short at the
solderpoints.
Greets
Dirk
You could consider wrapping the entire transformer+PCB in three layers of Kapton tape, to form a tough electrical insulator. Kapton is thin (1 mil), electrically insulating, and tolerates high temperatures. Then construct a metal faraday cage which fits tightly over the whole shebang, comfortable in the knowledge that the metal box can't make electrical contact with anything inside.
I buy Kapton tape on eBay (example listing) but I bet McMaster Carr and other suppliers sell it too.
I buy Kapton tape on eBay (example listing) but I bet McMaster Carr and other suppliers sell it too.
Right now I’m running the M2C boards with dual 400VA 20 volt transformers and Cap-Mx boards set to 42.5 volts from plus to minus and had no real hum before the covers. The transfers are standing upright. Im hoping the M2x boards are the same.
Hi,
Having just completed the ACA build I'm looking for another amp to build. It was suggested that the M2x might be a good project for me. I'm new to DIY audio and to amp building. Given that "The only stupid questions are the ones you don't ask" I've got some basic beginner questions. I do understand that as yet there isn't a build guide so there's less hand-holding than the ACA build.
Am I correct that these are the only components for the project that can be purchased from the DIY Audio store?
Amp Boards & daughter boards
Deluxe 4U Aluminum Chassis
Power Supply Boards
Back Panel Kit
I've downloaded the BOM and builder notes. I'm going through this entire thread. I'm checking Mouser and other sources as needed for parts. I'm also looking for other build guides to determine which may have applicability to this project. I need all the help I can get. For example, can anyone suggest a good source for the wiring I'll need and what wiring to buy?
It's occurred to to me that my need to ask these basic questions may indicate a lack of ability to successfully complete the project. I guess I could just buy the amp but I don't want that. I want to build it, or something similar.
Thanks,
Gary
Having just completed the ACA build I'm looking for another amp to build. It was suggested that the M2x might be a good project for me. I'm new to DIY audio and to amp building. Given that "The only stupid questions are the ones you don't ask" I've got some basic beginner questions. I do understand that as yet there isn't a build guide so there's less hand-holding than the ACA build.
Am I correct that these are the only components for the project that can be purchased from the DIY Audio store?
Amp Boards & daughter boards
Deluxe 4U Aluminum Chassis
Power Supply Boards
Back Panel Kit
I've downloaded the BOM and builder notes. I'm going through this entire thread. I'm checking Mouser and other sources as needed for parts. I'm also looking for other build guides to determine which may have applicability to this project. I need all the help I can get. For example, can anyone suggest a good source for the wiring I'll need and what wiring to buy?
It's occurred to to me that my need to ask these basic questions may indicate a lack of ability to successfully complete the project. I guess I could just buy the amp but I don't want that. I want to build it, or something similar.
Thanks,
Gary