Products > Test Equipment
DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes
tautech:
--- Quote from: MathWizard on November 11, 2024, 05:40:52 am ---I can test up to a 25MHz square wave, and 120MHz sinewave. Now for the tedious task of wiring the 1x connector, to a one sided proto-board...
--- End quote ---
FYI
Digital channels run through a comparator and thereby only display perfect edges, very unlike the behaviour observed with analog channels.
MathWizard:
Well I got it all made, but I had to modify the PCI-e 1x connector, since the scope doesn't use the same standard pinout. So I soldered little wires right onto the the contact pads of the connector. Not all the way to the tip, but so far I can't get the connector to fit into the slot.
It looks like the jacks lines up pretty well, and even feels like I can get part of the connectors to mate, and move in a few milli-meters, but at no time was it enough to even get continuity to GND. And every 2nd pad is GND.
So IDK if the little wires I soldered onto the back of the connector, and jamming in the slot, or if it's just not lined up enough, or going deep enough in.
For now I'll take all the tape and support of the PCIe connector, just so I can see what really happens when the jack goes in the slot. But it would be easier to sand down some of the solder/wires, sticking up off the connector, then trying to move them all back.
This is the connector pin out I've used on both top/bottom, I think from Tautech
tautech:
--- Quote from: MathWizard on November 11, 2024, 10:40:00 pm ---Well I got it all made, but I had to modify the PCI-e 1x connector, since the scope doesn't use the same standard pinout. So I soldered little wires right onto the the contact pads of the connector. Not all the way to the tip, but so far I can't get the connector to fit into the slot.
It looks like the jacks lines up pretty well, and even feels like I can get part of the connectors to mate, and move in a few milli-meters, but at no time was it enough to even get continuity to GND. And every 2nd pad is GND.
So IDK if the little wires I soldered onto the back of the connector, and jamming in the slot, or if it's just not lined up enough, or going deep enough in.
For now I'll take all the tape and support of the PCIe connector, just so I can see what really happens when the jack goes in the slot. But it would be easier to sand down some of the solder/wires, sticking up off the connector, then trying to move them all back.
This is the connector pin out I've used on both top/bottom, I think from Tautech
--- End quote ---
Nah, can't take credit for Mike Wyatt's work. ;)
See Sig at top right.
MathWizard:
Ok, I filed down the connector, it's barely any thicker than normal. But at best I can only get about 6-7 ohms to GND, and the only way I can get any digital signals is if I hold the jack pushed in pretty hard, which is bad. And at least 1 channel had noise way faster than the serial signals I'm looking at.
IDK if I have the vertical position lined up good enough, or if the connector pads are still a little too thick, but I'm talking tenths of a mm. Maybe I took too much off the outside edge. It feels more like it wants to pop back out tho, like something
s too big/high.
I used calipers, for some measurements, I don't think anything else is holding it up.
KungFuJosh:
Did you read what oz2cpu said about the PCB design? He was pretty adamant about 4 layer PCB with tight specifications.
I got the generic one with (I think) only 2 layers (before I knew about the awkwardness of that situation), but I'm sure it's not as good as the proper 4-layer design.
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