Jerry Gaffke via groups.io <jgaffke@...> wrote:
Signals ADC_5V and ADC_3V3 back to the host should be a bit high by maybe a tenth of a volt.
If the processor doesn't see a high enough voltage,? it waits until it does before running any further code.
It's ok if those signals are a bit high, but there is no margin on the low side.
Thanks! It works now, but if my QMX ever stops booting, this will be what
I'll check first.
I'm amazed the 78M33 works at all, that's a lot of power to dissipate.
It's very hot, but didn't bang yet. I'm testing it with the case open now.
I'll see what happens when I close it.
I'd recommend either going with a bigger regulator (and a heat sink), or
feeding the 78M33 from your 5v linear..
78M33 and 78M05 are on the same heatsink (ground plane), so I guess it
won't matter which one dissipates the heat, as long as the heatsink can
absorb it...
I'd love to use a bigger regulator, but there's almost no space there. Or
is there? Did you fit a bigger regulator?
