Thats clear! The major problem is when you have already drilled holes that are UMS conform the horizontal holes are 80mm apart and the vertical are 40mm,
so there is no way to use the drilled holes, so I will have to drill 16 new holes that are 90mm horizontal apart and 40mm vertical that wont look good at the end! So I am still puzzled if I should take them or not....
M2 only 2 output Mosfets, choose closest one and drill the other - This is DIY ! unless you're running production
You dont understand you have to mount the whole PCB on the heatsink not just two mosfets!!!
Yes its diy but why bother whit holes if you already have them drilled perfectly and doubling the holes will make a mess...
I drilled 4pcs 4U heatsink matched with UMS using hand drill and hand tap, it's not an easy job. And if pcb designer is willing to match with UMS hole will be much appreciated, you will save hundreds of new holes
Or maybe didiet will jump into M2 pcb?
I agree totally! Cos this is a GB I imagine the PCBs arent made yet so its not that much hard to redesign the holes which are 90mm x 40mm now to 80mm x 40mm UMS or is it?
I think the desire to space out properly the mosfets and to keep the input
transformer as far away from the rest of the circuitry is the challenge
to a UMS compliant pcb. We saw that with the F6 pcb, where on the
300mm case, one mosfet was quite close to the end of the case.
I would imagine if one were to design one just for the 400mm case, you
can make it mostly UMS compliant and have the mosfets in the F5 mounting
positions. The transformer end would be extended as far as possible and
you would need only to drill two holes to support that end.
Dennis
transformer as far away from the rest of the circuitry is the challenge
to a UMS compliant pcb. We saw that with the F6 pcb, where on the
300mm case, one mosfet was quite close to the end of the case.
I would imagine if one were to design one just for the 400mm case, you
can make it mostly UMS compliant and have the mosfets in the F5 mounting
positions. The transformer end would be extended as far as possible and
you would need only to drill two holes to support that end.
Dennis
I drilled 4pcs 4U heatsink matched with UMS using hand drill and hand tap, it's not an easy job. And if pcb designer is willing to match with UMS hole will be much appreciated, you will save hundreds of new holes
Or maybe didiet will jump into M2 pcb?
C'mon, guys, it's not that hard.
Who the h...l
has a 300mm case for a 25W class A project anyway???The standard case to keep the transistors reasonable cool is 400mm but there are a lot of 500mm cases around so no problem whit laying a good UMS conform PCB for all...
I second this. Just be careful and take your time taping and it is a piece of cake. This is called DIY by the way and this is a new diy amplifier. There may be some store boards in the works, check with 6L6. I am proud to be on the list to get this board being offered early and get started on my M2 of which I have already got the input transformers. Thanks grimberg.
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Who the h...l
The standard case to keep the transistors reasonable cool is 400mm but there are a lot of 500mm cases around so no problem whit laying a good UMS conform PCB for all...
500mm would be even better (though the diyaudio store doesn't have it).
Either way, you are looking at expanding on the existing UMS.
I should add that I have no stake in this. I have no diyaudio store case,
nor do I have a need to build an M2. I like the M2 quite a bit and I
just hope people will be able to build it.
Cheers,
Dennis
I always hated Lego
then I realized that they're perfect for making quick and non-complicated buck
D in DIY means ....... drilling
Creative idea! Maybe I should use Lego stones instead of PCB for M2! Great...
I like to drill!!!
Creative idea! Maybe I should use Lego stones instead of PCB for M2! Great...
I like to drill!!!
DIY drilling = dentist drilling
but it has to be done
If the only heat sinks you have available are already drilled to conform to the UMS, then you should NOT use the PCBs I designed.
Remember, this is a hobby, meant to give you pleasure when time permits. If this decision is causing you distress, just look for another solution.
I was quick to disclose in post #444 that my PCBs do not conform to the UMS, just so anybody interested would know right away what to expect.