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The diyAudio First Watt M2x
The diyAudio First Watt M2x
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Old 2nd October 2018, 08:21 PM   #681
pchw is offline pchw  United States
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Quote:
Originally Posted by Dennis Hui View Post
Hi Claas,

Thank you also for the info. For the belly band, is that some kind of copper foil tape?
Would you have a reference/part for that?

Thanks,
Dennis
Ebay, copper foil tape | eBay
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Old 2nd October 2018, 08:23 PM   #682
Dennis Hui is offline Dennis Hui  Canada
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Quote:
Originally Posted by pchw View Post
Thanks.
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Old 2nd October 2018, 09:34 PM   #683
chede is offline chede  Germany
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Quote:
Originally Posted by pchw View Post

Yes, that should work well.

I used 3M type 1181 copper foil tape. Important is the conductive adhesive. Most of the tapes in the link above feature that.



Even better would be 3M type 1345, especially made for this purpose.
(sample link: https://www.ebay.com/itm/TapeCase-3M...wAAOSwIWVY88UN )

... but that felt too expensive for me


Best regards,
Claas
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Old 3rd October 2018, 04:33 PM   #684
bk856er is online now bk856er  United States
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I bought a roll of 3/4" 3M type 1345 and offered samples in the main M2 thread, but no takers. Sometimes it can be found relatively cheaply.

BK
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Old 10th October 2018, 08:51 PM   #685
kendrab23 is offline kendrab23  Canada
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Thumbs up My parts for the M2X are starting to show up

I got my M2X PCB boards yesterday, and all the necessary transistors to build the amplifier main boards and the Ishikawa input stage today. I already had the Universal PSU PCB boards and a set of soft start/speaker protection boards on hand (I ordered the soft start/speaker protection boards a couples month ago to use for an Aleph J build, but this thread convinced me to try the M2X instead).

I will create an order for all of the parts to populate the amplifier and power supply boards, but can't afford to place the order until the end of the month. I will be placing an order for those Edcor autoformers then too.

As this is my first full DIY project (I have modified a few things in the past), I am taking my time, and ensuring I have everything on hand before I actually start building. This will also give me time to see what others here are choosing for their input stages, and how things are working out.

Someone mentioned having extras of those red "do not substitute" LED's on this thread. I have forgotten who that was, but if they can contact me, I will gladly buy a set at the end of the month (PM me with PayPal information).

Kendra
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Old 14th October 2018, 07:31 PM   #686
JSA1971 is offline JSA1971  Canada
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Very Excited to say I’m on my way! Just finished my main boards, did the power supply board yesterday. Can’t wait to get my M2 up and running.
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Old 15th October 2018, 02:34 AM   #687
RafaPolit is offline RafaPolit  Ecuador
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Given previous "horror stories" regarding the PSUs, be sure to test the PSU before hooking up the amp channels!
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Old 15th October 2018, 03:48 AM   #688
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by adason View Post
Where can one get the cover for edcor trafo?
You can fold your own from mu-metal.

Official M2 schematic

Click the image to open in full size.

This reduced the noise down to 0.1mV on one channel and 0.3mV on the other.
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Old 15th October 2018, 08:28 AM   #689
MEPER is offline MEPER  Denmark
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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?
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Old 15th October 2018, 11:06 AM   #690
JSA1971 is offline JSA1971  Canada
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Quote:
Originally Posted by RafaPolit View Post
Given previous "horror stories" regarding the PSUs, be sure to test the PSU before hooking up the amp channels!
Thanks Rafa for the reminder. My first project was an Aleph J and I followed the instructions to a “T”. I’ve got my lightbulb tester ready to go for when I’m ready to test and start powering the boards up. Simple device, excellent quick warning for a potential poof!
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