buy the neutrik xlr-male to xlr-female adapters and pick your attenuation
and use either 3 or 4 resistors depending on whether the dac is really balanced or not.
http://www.mouser.com/ProductDetail/Neutrik/NA3FM/?qs=sGAEpiMZZMv0W4pxf2HiV9y0EyfHsAgRI%2fcUCPoRaKI%3d
suggest you buy the transistor tester meter on ebay, cheap and the best
way to test them before you stuff them in the boards and then find out they
are not real.
i went back to the pictures to make sure
all of the parts on heatsinks in the original are on the
common heatsink bar in the diy-T2
there are 2sc3675's with no heatsinks in the original, and
they are that way on the diy-T2
So i can certainly make some of those, and out of the metal that turns superconducting at LN2 temperatures.
Put over a rare earth magnet, and they will spin for a very long time.
not supposed to tap the heatsink.
drill it the right size. transistors and screws and washer from the top,
transistor, thermal washer,heatsink,circuit board,washer,nut
3 hours total
6 shots of various vodka's
(new kickass Russian/French restaurant with 50 different vodka's)
http://dekarestaurant.com/
and after generating the netlist, its still correct.
scary
The nice thing is this way you can drive all 32 relays at the same exact time.
but unless you can calculate relay position, a lookup table is necessary
board file posted, needs checking
but but... its upside down.
anyway
http://gilmore.chem.northwestern.edu/atten2stereobal.jpg
2.05 x 3 inches
but only 2 layers and still have to add or change the drivers
yep 2 colums and both sides. you might as well put it all on one board because
of the size of the drivers determines the minimum width
if you solder all the resistors first, then possibly the inside row of pins on the
relays could be hard to get at.
I actually think I can get a balanced step attenuator with those relays in the same size
as the original, all 16 relays. But a human is unlikely to ever be able to assemble it.
transistors need to have a Vceo of 50v or more
bias is 150 ma and the current mirror as the VAS means
that the peak to peak voltage swing is 40V on +/-24v supplies
absolutely flat to more than 5mhz