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The diyAudio First Watt M2x
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Old Today, 02:17 AM   #5051
dantwomey is offline dantwomey  Canada
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The diyAudio First Watt M2x
Good to hear. Hopefully, I'll be up and running sometime this coming weekend.

Regards,
Dan
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Old Today, 04:54 AM   #5052
grataku is offline grataku  United States
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Quote:
Originally Posted by darrr View Post
My measuring interface is a notebook soundcard, so not the best. The maximum I can give to input is 0.5Vrms. I didn't even connect the dummy load here. I just wanted to observe the noise.
Input board is still Mountain View.
Darr,
if I see correctly in the picture (post 5026), you have the speaker gnd blue wires going to the amp board, when I did that my amp exhibited a slight hum as well which I attributed to some type of gnd loop. That goes away completely when I connect the speaker gnd to the star gnd on the PS. I saw this point discussed somewhere around here before. Worth a try to rewire.

Last edited by grataku; Today at 04:59 AM.
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Old Today, 09:12 AM   #5053
darrr is offline darrr  Poland
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Thanks grataku
I have already done the combinations with wiring so this option has already been checked. With no result. However, having a transformer outside the chassis , I will also check it again.
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Old Today, 10:41 AM   #5054
cubicincher is offline cubicincher  Germany
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Default to hayenc #5048

Hello hayenc,


the dimbulbtester - phenomena is well known with the M2X:

If you switch the M2X on the dimbulbtester dims down/ or goes off (then everything is o.k. with your M2X) and after a few seconds the bulb comes back shining. It is the same on my M2X. Also other members reported about this behaviour.


Greets
Dirk
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Old Today, 04:05 PM   #5055
thompsontechs is offline thompsontechs  United States
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hayenc, that behavior you had was normal for the M2.

here's how it goes, light comes in bright as the large caps charge, they reach charge and then dim down, it takes a bit to bias up the circuit.... it comes in slowly and the light will again get brighter. It depends on the wattage of the bulb, just how bright it will get.
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Old Today, 04:48 PM   #5056
Mark Johnson is offline Mark Johnson  United States
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Have a look at Official M2 Schematic post #3355


Click the image to open in full size.




_
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Old Today, 05:58 PM   #5057
hayenc is offline hayenc  United States
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Quote:
Originally Posted by thompsontechs View Post
hayenc, that behavior you had was normal for the M2.

here's how it goes, light comes in bright as the large caps charge, they reach charge and then dim down, it takes a bit to bias up the circuit.... it comes in slowly and the light will again get brighter. It depends on the wattage of the bulb, just how bright it will get.
Thanks much. Did not make it through all of the M2 posts and had limited my search to the M2x thread. After making the blasphemous heresy mods, the amp is settling in with offset.

Hoping for music this afternoon.
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Old Today, 07:12 PM   #5058
darrr is offline darrr  Poland
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I pushed the transformer back really far. This is what the ARTA graphs look like. On the second, when the edcor output is shorted.
Attachment 944378
Attached Images
File Type: jpg mountain view.jpg (195.4 KB, 47 views)
File Type: jpg shorted edcore.jpg (191.7 KB, 47 views)
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Old Today, 09:21 PM   #5059
darrr is offline darrr  Poland
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Next step
Power transformer setting and 50Hz noise. It is different for each channel. I have to find a common pointlewy%20kana%C5%82%20trafo%20na%20godzin%C4%99%2010.jpgprawy%20%20kana%C5%82%20trafo%20na%20godz%209.jpgJPEG_20210420_232047_4872055441746900396.jpg
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