My "avant-garde" M2 build
I want to share my finalized M2 build. After 2 years of owning a CNC machine, I've finally gotten comfortable and proficient enough for my first build with a "from scratch" enclosure. It ended up 20.5" x 11 x 9 and weighs right around 40 lbs!
Some details of the components:
- PSU and M2 PCBs from teabag GB
- Softstart and speaker protect from diyaudio store. The speaker protect indicator is broken out to the front panel LED switch so it blinks during protection / startup
- Heatsinks are from Heatsink USA, 10.08" profile (http://www.heatsinkusa.com/10-080/) for M2s, and smaller profile for bridge rectifier
- I got a good deal on the transformers on eBay. They are from Signal Transformer, 300VA/36VCT, have a static shield, and weigh a good 8 lbs each: https://belfuse.com/resources/MPI.pdf
- Iron transformer cover, massive binding posts, RCAs, feet are from gd-parts on eBay / Wholesale Buy Various Tube Guitar Amp DIY Repair Parts from mafaudio Vintage HIFI DIY. After seeing similar binding posts mounted vertically on some McIntosh amps, I knew I wanted to try something similar.
- T-slot extrusions for the sides from Misumi
I couldn't be happier with the M2's performance. Thank you to everyone that made this build possible and for making such a great project available.
I want to share my finalized M2 build. After 2 years of owning a CNC machine, I've finally gotten comfortable and proficient enough for my first build with a "from scratch" enclosure. It ended up 20.5" x 11 x 9 and weighs right around 40 lbs!
Some details of the components:
- PSU and M2 PCBs from teabag GB
- Softstart and speaker protect from diyaudio store. The speaker protect indicator is broken out to the front panel LED switch so it blinks during protection / startup
- Heatsinks are from Heatsink USA, 10.08" profile (http://www.heatsinkusa.com/10-080/) for M2s, and smaller profile for bridge rectifier
- I got a good deal on the transformers on eBay. They are from Signal Transformer, 300VA/36VCT, have a static shield, and weigh a good 8 lbs each: https://belfuse.com/resources/MPI.pdf
- Iron transformer cover, massive binding posts, RCAs, feet are from gd-parts on eBay / Wholesale Buy Various Tube Guitar Amp DIY Repair Parts from mafaudio Vintage HIFI DIY. After seeing similar binding posts mounted vertically on some McIntosh amps, I knew I wanted to try something similar.
- T-slot extrusions for the sides from Misumi
I couldn't be happier with the M2's performance. Thank you to everyone that made this build possible and for making such a great project available.
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Thank you all for the kind words!
@bk856er: Of course, it is the R1966 series from E-Switch and there are a lot of configurations available. The one I got is R1966ABLKBLKEFBLU E-Switch | Mouser.
@bk856er: Of course, it is the R1966 series from E-Switch and there are a lot of configurations available. The one I got is R1966ABLKBLKEFBLU E-Switch | Mouser.
reference adjustment?
my M2 is playing really nice for some weeks now buttttt...
i don't get it to work within the proclaimed specs on the attached scheme.
point A is 72mV,
point B is -64mV,
point C is 5mV,
voltage across R13/14 is 600mV,
voltage at optocoupler is 1-2: 1.047V
4-5: 10.4V
offset is fine
same on both channels.
all parts from Teabags BOM except Q1,2 = FQA
and Q3,4 = 8.84mA selected Toshibas from NicMac.
am i splitting hair or is there a real bug?
any input welcome
my M2 is playing really nice for some weeks now buttttt...
i don't get it to work within the proclaimed specs on the attached scheme.
point A is 72mV,
point B is -64mV,
point C is 5mV,
voltage across R13/14 is 600mV,
voltage at optocoupler is 1-2: 1.047V
4-5: 10.4V
offset is fine
same on both channels.
all parts from Teabags BOM except Q1,2 = FQA
and Q3,4 = 8.84mA selected Toshibas from NicMac.
am i splitting hair or is there a real bug?
any input welcome
Attachments
