Steve,
I think I have a pcb & carrier that might work better for you.
I have to wait for the samples still, but here's what it looks like:
https://raw.githubusercontent.com/aljex/pcb2molex8878/cham/pcb2molex8878.png
On this one the pcb is a simple rectangle with no funky steps in the
corners, no polarity hole, and instead a simple chamfer on the pin1 corner.
Dimensions are just 38mm x 16.2mm
For the chamfer, shorten two sides by 1.7mm
The carrier opening is 0.1mm bigger in both directions, so this is the
actual pcb dimensions.
--
bkw
On 8/10/19 8:00 PM, Stephen Adolph wrote:
Just the keys that fit the Molex. 2 on one end and one on the other end.
On Saturday, August 10, 2019, Brian K. White <[email protected]
<mailto:[email protected]>> wrote:
What do you mean by stubs?
The notches cut out of the corners?
There needs to be something to hold the pcb from sliding sideways.
The pin actually would do that well enough on one end, but since
the pin is far to one end, the other end would move too much (I
think), and you don't want two pins. So that little bit of
skinnier pcb trapped between those vertical edges at the ends is
enough to do it.
And I think I will simplify that to just be 45 degree angles at
the corners instead of those little steps the way it is now.
That job could be done some other way, not just that way. There
could be a single notch in the middle of the ends, and matching
ridge in the carrier, and no walls at the corners of the carrier
and no notches in the corners of the pcb, for one possible example.
If you didn't already have a developed design with a lot of work
already in it, and you were aiming to have all components on one
side anyway for other reasons like manufacuring, then the carrier
would be both stronger and effortless to make if the parts were
all on top instead of bottom. The pcb has to lay pretty close to
the bottom of the socket and so there is not much room between the
pcb and the floor. Plus then you could have the hole for the
polarity pin as long as you could make room between the traces.
The pin doesn't extend above the pcb, so you can have chips over
the hole, but not under it.
--
bkw
On 8/10/19 6:58 PM, Stephen Adolph wrote:
Thanks,
Why do you have the stubs for the molex on this drawing? I
would have thought that such things would be unneeded with the
carrier.
I have to take a close look at length. I think it can work
but with changes.
On Saturday, August 10, 2019, Brian K. White
<[email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>> wrote:
Here is a messy pdf
http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf
<http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf>
<http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf
<http://tandy.wiki/images/c/c7/Pcb2molex8878_pcb_dims.pdf>>
