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The diyAudio First Watt M2x
The diyAudio First Watt M2x
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Old 10th February 2019, 10:39 PM   #1371
chede is offline chede  Germany
... fascinated by amps
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The diyAudio First Watt M2x
Quote:
Originally Posted by MEPER View Post
The SissySIT is not "that" sissy…..if it requires a 5U ? :-)
I expect a 4U/400 to be absolutely fine for a SissySIT for us here in Northern / Middle Europe. I base my estimate on my experience with my Aleph J and M2 in a case that has heatsinks similar to the 4U/400 (160 mm high x 400 mm deep x 40 mm fins, but no wavy profile on fins). Aleph J with single pair of outputs ran on 19V / 2.2A or 24V / 2.0A, M2 is running on 24V / 1.82A. I can leave my hands on the heatsinks indefinitely.

I'm looking to build a universal case with a universal dual-mono power supply. Don't know what other interesting amps will come down the pike, and I want to have some heatsinking capability in reserve ...

Best regards,
Claas
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Old 10th February 2019, 10:53 PM   #1372
MEPER is offline MEPER  Denmark
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M2 must be double up as it is a PP so both output transistors burn 24 x 1.82 in heat?
Just below 90W pr. side?
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Old 10th February 2019, 11:12 PM   #1373
chede is offline chede  Germany
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The diyAudio First Watt M2x
Yup, that's correct
(I really should go to bed now ... )

Best regards,
Claas
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Old 11th February 2019, 12:12 PM   #1374
Mark Johnson is offline Mark Johnson  United States
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The diyAudio First Watt M2x
The manual for the First Watt M2 amplifier, which is available for download on First Watt’s website, says it draws 160 watts from the mains. That includes both channels. Remember that not all of the heat goes into the two heat sinks. Some heat is dissipated in the bridge rectifiers. Some is dissipated in the CL60 inrush current limiters. Some is dissipated in the toroidal power transformer, which is not 100.0% efficient after all. And some heat is dissipated in the CRC filters of the power supply.

If really Really worried , you might ask someone who has a complete and working M2x to measure it with a home appliance watt meter. Here in US the dominant cheap brand is KillAWatt from Amazon.
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Old 13th February 2019, 06:04 PM   #1375
MEPER is offline MEPER  Denmark
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I got my Norwoods boards today. Thanks a lot. They looks great! …..will take a while until I am ready to test them as I need to build rest from scratch.
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Old 14th February 2019, 05:28 PM   #1376
cubicincher is offline cubicincher  Germany
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Default M2X experience

Hello M2X-builders,


today I mounted my overhauled NORWOOD - boards into the amp.
All is working! Fantastic!
I think responsible were my solderjoints at the OPAmps. I am not sure.
I resoldered the complete boards. I think I will never use Pb-free-solder
anymore for SMD-devices?!
I cleaned the NORWOODS from the flux (with Isopropyl-alcohol and an
unused toothbrush ).
Offset at loudspeakeroutput was measured 20 seconds after turn on.
(without any adjustments). 7 mV and 0mV seems pretty good?

I am running them in. Music is playing. Success!


Sorry to everybody I was confusing! I apologize!
Special thanks to Mark Johnson, 6L6 and MEPER!


Cheers
Dirk
Attached Images
File Type: jpg NORWOOD overhaul 1.jpg (97.1 KB, 182 views)
File Type: jpg M2X NORWOOD back in.jpg (142.4 KB, 177 views)
File Type: jpg M2X NORWOOD offset 20sec.jpg (100.3 KB, 174 views)
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Old 14th February 2019, 05:31 PM   #1377
6L6 is offline 6L6  United States
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The diyAudio First Watt M2x
Fantastic news!!!


Yes, you have found that Pb-free solder is not very good...
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Old 14th February 2019, 07:49 PM   #1378
MEPER is offline MEPER  Denmark
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Congrats with the success!
I have red Norwoods!! ...the sound should be a bit "warmer" than the blue Norwoods.
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Old 14th February 2019, 07:54 PM   #1379
WKCox is offline WKCox  United States
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The diyAudio First Watt M2x
Great news! Glad all is well. Enjoy!
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Old 14th February 2019, 08:10 PM   #1380
WKCox is offline WKCox  United States
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The diyAudio First Watt M2x
Quote:
Originally Posted by Mark Johnson View Post
The manual for the First Watt M2 amplifier, which is available for download on First Watt’s website, says it draws 160 watts from the mains. That includes both channels. Remember that not all of the heat goes into the two heat sinks. Some heat is dissipated in the bridge rectifiers. Some is dissipated in the CL60 inrush current limiters. Some is dissipated in the toroidal power transformer, which is not 100.0% efficient after all. And some heat is dissipated in the CRC filters of the power supply.

If really Really worried , you might ask someone who has a complete and working M2x to measure it with a home appliance watt meter. Here in US the dominant cheap brand is KillAWatt from Amazon.
To Mark's point, here's measurements from my M2x using a Kill-A-Watt-EZ Electricity Usage Monitor:

AC input Voltage = 123.2 V
Frequency = 60 Hz
Current = 1.65 Amp
Watts = 145 Watt
Volt Amps = 201 VA
Power Factor = 0.71

My build is a fairly standard build, using diyAudio Store amp and PS boards with AnTek 300 VA toroid.

Before building a couple of First Watt amps, I expected these things to be space heaters that could warm our cold Wisconsin winter nights. Turns out they give off less heat than an old 3-way incandescent light bulb!
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