birgir's brain is on free-run after building 6 x carbons...
pick the closest thing you can get to 440k and then recalculate the other resistor
or pick numbers for 2 resistors that add to 880k
it does not have to be super exact, the voltage will be slightly off, no big deal
http://gilmore.chem.northwestern.edu/boards/kgsshvcarbonv2.zip
this is the version 1 board above with the cascode current sources and 4 of the transistors replaced with pzta
series parts.
not tested, but I would have to be an idiot to mess this one up.
(someone should check)
the tested board is kgsshvcarbonv1.zip
this is the original board with the original limited servo and the adjustment pot.
joamat has tested the left and right versions of the boards.
the Kerry servo an the joamat servo boards have not been tested.
birgir thinks the extra servo is not necessary because the amp is extremely stable
without all the extra parts.
the original kgst boards are fine
the ones with the cascode current source have the one heatsink ungrounded.
how this happened, who knows. Its why i need a much bigger monitor.
the oscillation was in the ltspice simulation.
board run now, will know for sure once i build it.
possibility of z-foil .15 spacing resistors, going to screw up
the ground plane on the back
will try later
no 20 ohm z-foil resistors that i can find...
playing around with the board for sorenb, i found that the right heatsink is not grounded.
really should be grounded, best place is the ground on the power connector
this probably means the original board has the same issue
will update boards now
the cree part is a to246, so no.
besides which people want to run at 20ma or more, and at 450V power supplies that is 9 watts
no onboard heatsink I know of is more than about 4 watts
all the new cars I know of play music right from your ipad or iphone.
or a host of other digital devices. wired or wireless.
and the 2016's come with Pandora and iTunes direct from the onstar box.
surface mount board finished and tested and bug free. http://gilmore.chem.northwestern.edu/dsc_0659.jpg
there is one set of boards left if anyone is interested