so why you use it
Posted by renesis at 13:01 | permalink | 0 comments
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i dont think theyre nylon but i remember seeing the material and thinking, cool
pretty sure its not pvc
PA66
Yeah, nylon
the worst plastic ones are like pvc or something, you can bend the housing with a thumb and finger
and like, they will bounce back mostly the same, pretty useless
i think neutrik stuff is glass composite abs
Posted by renesis at 11:52 | permalink | 0 comments
the petrochems in the china air prob keep them from getting cruddy
they seem okay for one or two insertions, like products ship with them and dont come back
but after maybe 3 or 4 insertions you can see the plastic deflecting away from the latches
and like, long headers will have problems where the ends will mate but the middle will have warped and some pins intermittent
like the 2x20 shit
and they constantly push up out of their housings
like, you learn to grab the bundle and push the wires
which almost defeats the point of a connector but whatever
yeah you gotta go way hot and super quick
low temp is too hot
the guitar project had these problems
the real stuff is usually nylon or glass composite plastic
Posted by renesis at 11:47 | permalink | 0 comments
rab: the shit i saw on amazon looked like someone crimped it in 1986
and a lot of it looks like weird oversized PVC insulation
china CM stuff is kind of like that if you dont give them a cable drawing
the soft connectors and oxidizing contacts
Posted by renesis at 11:42 | permalink | 0 comments
all my shit is from digikey
like, im using premade molex minifit cables and cutting them in half for psu crimps
and 3m ribbons
i dont trust random ribbons
they fail a lot in audio
like, mixers, amps and subs, stuff that gets moved a lot
dab of hot glue would fix in most cases
i might just do like, .25" lexan and some vhb pads under the lcd to eat up gap
Posted by renesis at 11:20 | permalink | 0 comments
i guess the easiest way to describe the size of the factory: there was about 10 timeclocks mounted to one wall by the exit
Posted by renesis at 11:06 | permalink | 0 comments
supports an accelerated life test for dialysis machines
theyre rental things w/ 10 year rated life, so they push em out for three years, bring them home and test, refurb, send em out for another 3 years, retire
the test needs something to fill and drain bags
big 5L things
thats our project
like, they have an old dying machine cost them $100k, but their test area spread out and the one amchine has become a bottleneck
so we are doing prototypes of something they can short run produce to support a bunch of test machines
the machines have maintenance firmware and pretty much test themselves
so they got a bunch of techs running around with 10 lbs water bags, machines running on 3 hour test cycles
im impression is there is a bag runner traffic jam
*my
we visited on a weekend and they maybe had a couple hundred DUTs on shelves three high
Posted by renesis at 11:01 | permalink | 0 comments
i dont know if i want to do the LCD on the board, or attach it to the lexan shield and connect with JST-PH
they spec solder or jst ph in the datasheet
it will look better glued to the lexan w/ cable
jst ph?
the 3m box headers are idc connects with flat ribbon
ph is a 2mm pitch wire housing/header
theyre using in a lot of RC and battery stuff
*used
and minifit-jr is mobo psu connector
like, 'molex connectors' are actually amp-tyco, and mobo connectors are molex
shrug
the minifits are for power supply and connection to motor driver optos
3M ribbons are for controller board to db9 panel connector breakouts
school project, but its for a medical company sponsor
Posted by renesis at 10:56 | permalink | 0 comments
timecop: that board was going to be cree 5mm LEDs and to-220s
another board has through hole pressure sensors, so i did a dip instrumentation amp
and im going through hole biggy tac buttons, ones with 500k cycle life
and th 3m box headers
but everything else on that board is going to be SMD
like, some of the boards are just an assman db9 and a molex minifit-jr or 3m box header
but on that board specifically, the majority of the parts could be wave soldered
and then the to-220s, connector and fuse holder hand soldered
the sensor board and db9 breakouts can be wave soldered, done
the controller/ui board is reflow, then hand solder the buttons and pin headers
Posted by renesis at 10:51 | permalink | 0 comments
17:58:38 < jero32> but I had to copy it by hand into eagle
i dunno how you can bitch about eagle UI and then claim practice using it in an academic scope is dumb
just saying
Posted by renesis at 10:00 | permalink | 0 comments
maybe
7805 have under 60dB PSRR
i think its over 50dB
or maybe LM317, but its ballpark around there
so if there is like, a 5v swing on the supply, it might show up at 10mV on the regulated rail
PSRR usually gets worse as freq rises, to
so if a very high slew rate impulse happens, like motor switching, it can get through
like, motor might be spinning at 100 Hz but it might create some spike that like like 1MHz+ for a fraction of a cycle
*that looks like
like, fast rise times and hard edges look like very very high frequencies for an instant
Posted by renesis at 04:15 | permalink | 0 comments
and a cap that big, load sag is probably pretty low
easier on the 7805 but thats almost like putting door guard stips on a tank
is there a lot of switching or is there an adc?
yeah so its maybe just trying to get rid of junk
its maybe a problem if the pic has a variable load and its using its supply rail as adc ref
Posted by renesis at 04:07 | permalink | 0 comments
grid is pretty variable
like i do all sorts of weird grids for random pin spacings
is there a cap after?
its a filter
1/(2pi(10R)(10uF))
@ 1591 Hz
so itll kill damn near anything in the air
Posted by renesis at 04:02 | permalink | 0 comments
jero32: there is a little preview window?
im not sure if it has grids
all my part footprints and symbols are out of my own libraries, i always have them both open so i dont have this issues
Posted by renesis at 03:53 | permalink | 0 comments
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