Jerry Gaffke via groups.io <jgaffke@...> wrote:
Can't imagine how that dinky 78M33 manages to dissipate so much heat
through one or two skinny Sot23 ground pins.
Barely :) But it's only a matter of heat, not of current, so I guess it
should be OK. It transfers the heat to the ground plane quite efficiently.
Here's how it looks like. Tons of solder to increase thermal capacity.
It's uneven, because there are "vias" (from wire) going to the other side
(and other side has a ground plane too, just to dissipate the heat).
BTW, capacitors are a little too large, the display doesn't fit (I guess
I wouldn't be able to close the case without squeezing them). I'll have
to cut the board below them, or order smaller ones. But first the buzzing
problem (described in another thread)...
Now I'm wondering how hot this IC gets when QMX (with original boards) is
left in the bootloader mode, with linear regulator enabled for extended
time.
