all right it's time for an update on the IBM PC junior adapter boards so I have
ten PCBs in ten molex mini fit junior right angle twenty pin connectors and
based off of the recommendation of many people a Pico PSU now I needed a power
switch for the back so I ordered two different kinds because I wasn't sure
what was gonna fit well for some reason Mouser seemed to think that these ones
were fragile so yeah hopefully not but I'm gonna try out both of these fit in
the back of the case I think these ones I have to cut off this part I don't
remember I measured it out before but there's nothing that really fits quite
right in the switch position or the power connector position I should say on
the back of the PC junior so yeah I have to get creative there now I ordered ten
boards ten switches and ten connectors but I'm going to be using one of these
myself and I'm going to be keeping one blank as a reference and one of these is
possibly already spoken for so when I'm done here I'm actually gonna have seven
left over from this first batch so I might be looking to get these into other
people's hands but you'll want to wait for the end of the video before you get
excited about that alright now it's time to get one of these put together so we
can test it out
all right that's all there is it's a very simple board
so yeah let's plug it in power it up with the Pico PSU and verify all the
voltages all right so let's plug this in I've just removed all the extra cables I
don't need for now like that goes in really nicely so okay I'm gonna clip to
ground here just verify that's a good connection yep
all right let's power this up and check it out so negative 12 is negative 13
point 5 but it's it's not loaded so that might be fine
5 looking good that's ground and 12 success so uh yeah that's looking pretty
good I'll uh put together a proper power cable instead of using this little
jumper thing and then we're ready to stick it in the PC jr. and see what
happens all right we can just slide this in now and oh that's a, that's a good fit
and mmm I see a problem I gotta do a new board design for the Pico PSU is too
tall so I have to do a new board layout to accommodate this since I didn't know
that was a thing that existed the first time I didn't design it to handle that
much sticking straight out I had put the connector at a 45 so that the cable
could droop sideways [unintelligible] and not put a lot of strain on it so uh yeah that's
gotta be redone also while I'm explaining stuff some
people asked why I didn't just put the connector on the other side last time
when I found out the pin out was backwards well there's not enough space
between the power supply board and the RAM card to have fit the ATX connector
there was really barely enough to fit it this way so I couldn't have put it going
that direction even if I wanted to well I was kind of planning on redesigning
the board anyway but I'll talk about that a bit later for now I still need to
test this so I got my power switch wired up let's just go ahead and feed it in
there and plug it in either way doesn't really
matter just pulls the signal low now the molex 4 pin connector off of that does
not reach so I'm going to use this SATA to molex adapter here and that will reach
just fine since I can't close the case anyway there's no point routing this
nicely and finally we'll plug the fan in down here alright I'm ready to try
firing it up alright everything's installed so let's see how well it works
now that is satisfying well I would say this thing is a success it's it just
works the only problem it has is that the
pico PSU is just a bit too tall on there and I don't really consider that a
design flaw I just didn't know the pico PSU existed when I started this
additionally now that I know I'm gonna use the pico PSU I'll want to come up
with a new solution for the four pin power here now originally I was just
gonna use a power from the power supply but that's not really an option now
because this power cable is too short it won't reach over to the floppy drive
so what I'll probably do is add the power connector for this to this board
like it is on here so that'll make it so that'll make it so you can just power
the board from there so we're gonna have the power for the molex built on and I'll
keep the fan header and I'll keep a power header but there's a another
change I want to make now with the pico PSU on my little adapter board in here
we're really close to a sleek easy to use solution I still have this dangling
cable and a need for some kind of power button though now I was thinking I might
make a longer PCB that comes over like this one does and I would get this power
button and try and make that happen but this power switch is like five bucks to
get nowadays so I don't think it would be really worth spending that much on
just a switch because this is this is only reasonable if it costs less total
than just buying the AC power supply for this so what I think I'm gonna do
instead is try and design a board that goes here that holds the panel mount
power connector in place and holds a right-angle switch now I could just do a
cabled switch like this and have it be in the back and that works well enough
the problem is is there aren't any size switches that actually just stay in
place so either has to be under tension which kind of sucks or I could make
something that held in place maybe by these headers
down here and then you could have the power button there so I'm gonna think
about that and play with a design okay after doing a bit of looking around I
found this rocker switch on digi-key that I really like the look of its panel
mount so I can easily mount it to something on the inside of the case and
it's a red rocker switch that matches the original one fairly closely now in
order to mount that I've gone ahead and designed this panel this is the side
that will be facing the outside of the case and the inside is here now on the
inside of the PC jr. case there's a little Ridge down here that this will
slot into and then in the lid there's a large lip that should cover this spot
right here so I'm hoping I can print this out test fit it and make sure this
will work out well I still don't have that switch from digi-key so I'm gonna
print in a slot for it just to see and when I get them in then I can try
test-fitting it up here is the panel mount for the 12-volt barrel Jack I was
going to try and make this a PCB component so I didn't have to print it
out but I think it's just gonna be better off overall if I 3d print this
because it would rattle around in there as it was a loose thin PCB and this with
the larger support pieces in here should stay in place pretty well
all right my parts print it out so let's see how well it fits ooh I like that let
me put the lid on oh that closes nicely here's what it looks like from the back
it's kind of hard to make out because it's black but yeah that's it right
there it can't be pushed in because I'm
latching into the bottom and a piece along the top here so that's pretty
firmly held in place let's try threading the power jack into that all right so I
want to have the power jack just mounted as cleanly as possible coming out this
side so made the hole just about yeah the right size to thread onto here yeah
I like that it's in there real strong so with the top of the case on in the plate
in place you just plug it in really easy oh it's getting so close to good I just
need to go back and update the board design to account for that my my badge
fell off while I was doing this so I'm to have to re-glue that back on too but yeah
so yep let's revise the PCB
you
all right I've got my proxy version so let's install this and
here we go,check my clearance oh that's perfect that is seriously that's gonna be
perfect yep okay time to order those boards now welp, I'm glad I bought these
so I can just order those new ones but whatever I knew I was gonna rev it so
yeah well I think that about wraps this up
there's a well yeah not much to do now I just have to order in these boards and
get in the power connector for the molex cable that goes to the floppy drive and
get the new panel mounts switch that'll go on to the 3d printed component in the
back and this should be done so yeah I'm looking forward to that it's a shame I
ordered so many of these and now they're basically out of date since the
requirements have changed I didn't know the Pico PSU was a thing when I
originally designed those even with the right angle connector an actual ATX
power supply clears the lid just fine but obviously the Pico PS use a great
solution so I want to be able to accommodate that as well so if anyone
wants an ATX only PCB go ahead and email me I'll put my email address below and
we can work something out personally though I'd rather wait until the Pico
PSU wants done but yeah I don't know if you don't have any use for the Pico PSU
version now might as well get these into the hands of people who can use them
but for now that's it so I'll see you later