Low cost logic analyzer probe for Rigol MSO5000 EasyEDA project

[S. Petrukhin]

There are no messages on my scope. I can press the LA button, but there is no change in the digit channels.

What is the model of your oscilloscope?

[imolnar]

5074 with patched firmware

[S. Petrukhin]

5074 with patched firmware

Are you sure about the correct cable connection?
Pin 1 "Probe detection" is located on the right side in the upper row when looking at the oscilloscope.  Connect the two right pins - probe detection.

[imolnar]

I hope so. The other signals are in the right place. (4V, +-2.5V, Refs).

[Peter_the_diver]

Hallo everybody!
I got certain inquiries regarding technical documents of the analyzer V3 in the last time. Please find the complete set of design documents here at my website eltguy.de.
have fun!

[Swake]

Hi Peter and S. Petrukhin,

What size are the resistors, the capacitors and the LED in the V3 design? 0805, 0603?

The Onsemi MC33375ST-3.3T3G in SOT-223-3 package is not in stock. A suggestion for an alternative would be very welcome.


Thanks all for this nice little project, it has a high approval rate of the wallet manager

[Swake]

Have found the XC6203E332FR-G with Quiescent Current of only 8 µA. I think is needs 3.5V on input minimum
Max Input voltage is 8V, is that enough? I remember something about 4V input.
Different implementation compared to the MC33375ST (no on/off pin for example) this will require PCB change.

Alternative is MCP1755ST-3302E/DB  with Quiescent Current of only 68 µA. Needs 3.6V on the input minimum.
Max Input voltage goes up to 16V. Also different implementation compared to the MC33375ST, but less change required.

[S. Petrukhin]

Hi Peter and S. Petrukhin,

What size are the resistors, the capacitors and the LED in the V3 design? 0805, 0603?
The Onsemi MC33375ST-3.3T3G in SOT-223-3 package is not in stock. A suggestion for an alternative would be very welcome.
Thanks all for this nice little project, it has a high approval rate of the wallet manager

Hi, Swake!

Version 3.0 was created by Peter_the_diver. I do not know the details.
I think it makes sense for you to take a look at the board and the documentation that Peter kindly published on the site eltguy.de.

[Swake]

I see now there is more than one page in the PDF.... 

[gharac]

I have built version 3 with a MCP1754. It works and has enough drop-out and mA. However, the middle pin must be lifted because the MCP1754 has no enable pin. Alternatively cut the trace between pin 1 and 2.

https://ww1.microchip.com/downloads/en/DeviceDoc/20002276C.pdf

[Peter_the_diver]

good morning Swake,
as Sergei already mentioned, you find the housings in my documentation. Please take look at the BOM (page2).
Regarding LDO gharec has described a valid option.

[NRS63]

and here some more.

Could you post the design of the box?

[S. Petrukhin]

and here some more.

Could you post the design of the box?

It slightly does not match the holes for the connectors, it needs to be modified with a file.
I didn't correct it, I'm sorry. If you can do this, please post the correct version here.

[NRS63]

Спасибо ! Я кстати собрал плату по Вашим чертежам и все отлично работает ! Детали с Алиэкспресс . Единственно обманули с микросхемой 3.3 в ,прислали обычную 78l33 с маркировкой

[NRS63]

Sergey hi! I changed the holes for connectors in the Compass-3D program, I don't have any programs for printing and AutoCAD, so I couldn't save it in the right format.

[suarezvictor]

I think a faster way to couple digital signals is by a XOR gate used as a inverting buffer and another as non-inverting buffer, followed by a resistor networks that adapts levels
I designed such a resistor network for signals of 3V (3.3V is similar or also the same circuit will work)

Common mode voltage is 1.25V and expected termination 100ohm, for 3.5-4mA (see simulation)
XOR gate can be a fast SN74AUC1G86DCKR (1ns propagation delay)

[suarezvictor]

I was able to detect 1ns pulses (see red trace) by direct connection to LVDS inputs. So that timing can be reached in a probe board using differential inputs buffered by a faster buffer, like SN65LVDS100 (up to 2gbps)
Note that same IC can be used for a CMOS to LVDS translator, the one without a termination resistor is much like an analog comparator with a bit of hysteresis (capable of 0 to 4V inputs)

[andy_edin]

Hi,   This looks great - and a much better option that the Rigol probe for my limited needs. 

I have the DS1104Z Plus scope with the the 68 pin HPDB LA connector.  Has anyone tried this design (or the budget MSO5000 probe https://www.eevblog.com/forum/testgear/ms05000-budget-logic-analyzer-probe-set-design/?all) on this scope ?  Maybe there is even a PCB with a HPDB plug instead of the 40pin IDC for the MSO5000 available somewhere ?

[Andrey_Ak]

Good afternoon!

Please tell me, did you say to take these drivers SN65LVDS1DBVRG4
https://www.lcsc.com/product-detail/LVDS-ICs_Texas-Instruments-SN65LVDS1DBVRG4_C50990.html

But these won't fit by any chance? SN65LVDS1DBVR
https://www.lcsc.com/product-detail/LVDS-ICs_Texas-Instruments-SN65LVDS1DBVR_C465731.html

??

[Nikki Smith]

Hi,   This looks great - and a much better option that the Rigol probe for my limited needs. 

I have the DS1104Z Plus scope with the the 68 pin HPDB LA connector.  Has anyone tried this design (or the budget MSO5000 probe https://www.eevblog.com/forum/testgear/ms05000-budget-logic-analyzer-probe-set-design/?all) on this scope ?  Maybe there is even a PCB with a HPDB plug instead of the 40pin IDC for the MSO5000 available somewhere ?

I've designed an improved (and cheaper) version of the board in KiCad for the MSO5000 (and new DHO900) series. I'd also like to do a version for the DS1000Z Plus series with that 68-pin connector, but I don't have that scope to test it with. Would you be interested in trying an alpha-test board Andy? Thanks
https://climbers.net/sbc/clone-pla2216-logic-probe-analyzer/

[Andrey_Ak]

I've designed an improved (and cheaper) version of the board in KiCad for the MSO5000 (and new DHO900) series. I'd also like to do a version for the DS1000Z Plus series with that 68-pin connector, but I don't have that scope to test it with. Would you be interested in trying an alpha-test board Andy? Thanks
https://climbers.net/sbc/clone-pla2216-logic-probe-analyzer/

I like this option. I would try to order the manufacture of boards for myself.

Only the drivers are not on sale
https://www.lcsc.com/search?q=SN65LVDS391PWR
https://www.lcsc.com/search?q=SN65LVDS391D

[Nikki Smith]

I've designed an improved (and cheaper) version of the board in KiCad for the MSO5000 (and new DHO900) series. I'd also like to do a version for the DS1000Z Plus series with that 68-pin connector, but I don't have that scope to test it with. Would you be interested in trying an alpha-test board Andy? Thanks
https://climbers.net/sbc/clone-pla2216-logic-probe-analyzer/

I like this option. I would try to order the manufacture of boards for myself.

Only the drivers are not on sale

Note that I'm still working on the design, and the boards haven't been tested yet!
LCSC are temporarily out of stock (I got some last week), but I've just checked and both chips are in stock at Digikey, Mouser and RS for a similar price to LCSC.

[S. Petrukhin]

The discussion of the oliver probe option has been moved here: https://www.eevblog.com/forum/testgear/another-low-cost-la-probe-for-rigol-mso5000-by-oliv3r

[oliv3r]

Super!! Thanks for whoever did it

I think we're all happy now.