Products > Test Equipment
DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes
rosenrot:
--- Quote from: aystarik on November 04, 2022, 12:08:47 pm ---Hi,
I've desided I want my own design of the PCB for RF1.37 (https://aliexpress.ru/item/1005003601266058.html) coaxial cables (1 ground pad for each input) : and also make it more "equal". I think I'll try to have input-end 120 ohm resistor directly on the cable, without additional boards -- like here: https://community.element14.com/technologies/test-and-measurement/b/blog/posts/building-solderable-in-circuit-oscilloscope-probes
github repo with kicad project is here: https://github.com/aystarik/siglent-la
--- End quote ---
Any recommendations (signal quality/or anything else) getting one of these? Did we hear back if this design is working out?
I added some holes to hold a 3d printed enclosure later on.
MathWizard:
I'm making a version using a male PCI-e 1x connector, and 2-3cm of it's cable I made into twisted pairs. And the LVDS cables from inside one of my old LCD monitors, all twisted pairs, with an outer shielding for the bundle, they are between the POD and BASE. On one end they have connectors that fit standard 2.54mm headers.
None of my wire strippers are meant to strip wires that small, I think the LVDS cable is 28AWG. My strippers can do it holding them side-ways, but it's easy to cut a few strands from the wire.
None of this has a GND plane, including the cheap PCI-e 1x PCB. So I just went with 240R and 91k||8pF on the POD, and for the BASE I'm using a 2pF shunt and 360R series into the 1x PCB. And all these resisotrs are 5% and the caps are probably 2p +/-1pF.
Using the 3 transmission lines Maywaytt used, for the 2 connectors and twisted pair, I get something that looks about right in LTS.
Now to finish making the BASE, using some more through-hole proto-board, and some cut up charge cards/gift cards. And maybe some thick paper packaging material, and of course lots more electric tape.
If it works any good, I might try making an SMD version on proto-board. Or trying island style with copper clad boards, I forget I've made stuff like that before. Or I could just order the PCBs.
KungFuJosh:
--- Quote from: MathWizard on November 11, 2024, 03:05:27 am ---Or I could just order the PCBs.
--- End quote ---
:-DD
Coldblackice:
--- Quote from: MathWizard on November 11, 2024, 03:05:27 am ---I'm making a version using a male PCI-e 1x connector, and 2-3cm of it's cable I made into twisted pairs.
If it works any good, I might try making an SMD version on proto-board. Or trying island style with copper clad boards, I forget I've made stuff like that before. Or I could just order the PCBs.
--- End quote ---
Would love to see this! Please share progress, if willing.
MathWizard:
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...
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