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RPL1116 (MSO1000Z) and PLA2216 (MSO5000) Active Logic Probe teardown

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dren.dk:
Nice, but 0.6 mm 4 layer boards aren't all that cheap:) Perhaps it's ok to accept normal through hole mount, it's not like the straddle mount is that much smaller.

For me it's more important to be able to hand assemble the first 10 units and rework mistakes than it is to the get to the smallest possible size.     

I've been considering using a 2x8 female socket for the input with half of the pins dedicated to gnd. Probe wires with male ends are easy to find, but the really neat way to interface with that would be a single-use board with male headers that can be soldered to the DUT and left there.

I find I often have to solder wires to the DUT to be able to clip test leads or a scope probe on, so having the interface to the LA be soldering to a board seems like it would cut out the middle man.

dren.dk:
bwt. rerouter: Nice looking layouts there.

I just did the core of my own 16 channel pod layout with lmh7324 yesterday, everything except connectors fitted nicely in 32x54 mm, even with 4mm of space around the ICs for rework, it's funny how easy it is to route on 4 layers, even when dedicating a whole layer to the ground plane.

I don't think I like the 16 channel pod as an idea at all, for three reasons:
* Pulling all the single-ended input connections together into one location might be tricky.
* Pulling the big fat uplink cable from scope to pod is going to be clunky, even if it is 0.025" pitch.
* Aside from the 68 wire scsi cable idea, sourcing a small amount of 50 wire ribbon cables and connectors is quite hard, while 26 pin 0.025" ribbons are much more accessible.

dren.dk:
rerouter: I see what you were saying about routing the header for the 0.635 mm pitch ribbon, it's annoying as all hell not being able to put a wire between the pads.

Rerouter:
As per the 0.6mm 4 layer pcb. I may be able to walk that back to a 2 layer 0.6mm pcb. As the thickness is low enough that the impedance widths are easier.

And yeah differential wiring the header was my nightmare when it wasnt inline. It can be done. But its not that easy and definatly seperates the differential pairs for a bit to ensure they are side by side on the ribbon

wulfman:
Just placed my prototype order b board 2 layer was 50 cents each quantity 10, a board 4 layer was 2.90$ each  quantity 10

IF these work as advertised i will upload all the project files to gitlab for all to use. Or i will have 9 extra boards available  :D

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