Author Topic: Low cost logic analyzer probe for Rigol MSO5000 EasyEDA project (Read 80342 times)

bbandi · « **Reply #75 on:** March 20, 2021, 08:19:29 am »

Hi,

This design should work with the 1074z, right? I mean, with a custom 68pin-50pin converter of course.

Thanks,
Andras

S. Petrukhin · « **Reply #76 on:** March 20, 2021, 01:31:48 pm »

Yes.

justanothername · « **Reply #77 on:** March 22, 2021, 07:37:53 pm »

Ok, I built this and it seems to work. The negative edges are omewhat jittery at 5 MHz (with the DG1022 as source). Can't tell why. I tried connecting the plane to gnd with solder jumper and I installed more decoupling capacitors.
Does not have any effect. Could be a display thing, or something with my generator or it could be caused by ringing (my guess). Since I do not have the original probe, I can't say if it behaves differently, better or worse...
Anyway for normal usage it is satisfactory so I wont dig any more into this. Thanks again for the design.

ebclr · « **Reply #78 on:** March 26, 2021, 12:47:51 am »

On the Output of MC33375ST-3.3t3g on schematics show 4v, The correct value isn't 3.3V? Or do you use another regulator?

normi · « **Reply #79 on:** May 04, 2021, 06:38:56 pm »

Quote from: ebclr on March 26, 2021, 12:47:51 am

On the Output of MC33375ST-3.3t3g on schematics show 4v, The correct value isn't 3.3V? Or do you use another regulator?

4V is the voltage supplied by the scope, and is regulated down to 3.3V.

normi · « **Reply #80 on:** May 04, 2021, 06:50:14 pm »

Got this built and was able to use it up 160MHz, there was jitter, but I have not worked out whether this could be improved with probing technique. Also I only had a few Dupont cables pieced together to use as probes. I used an FPGA which generated a 160MHZ clock then broke this into 4 bits which would count to 16, (0-F). The parallel decoder was used for this.
See attached screen shot.

normi · « **Reply #81 on:** May 04, 2021, 06:54:30 pm »

Thanks to all who contributed to the design.

S. Petrukhin · « **Reply #82 on:** May 05, 2021, 11:49:52 am »

Quote from: gurong60 on March 22, 2021, 01:49:26 pm

Hello, why don't you use 4-layer PCB. JLC's 4-layer PCB is only 5 US dollars in size of 50*50mm. Size 100*100mm is only 9 US dollars.

It makes no sense to make 4 layers, fill two of them with a power bus and create parasitic capacities.

S. Petrukhin · « **Reply #83 on:** May 05, 2021, 12:02:45 pm »

I didn't use any stabilization tools for jitter. LVDS chips have a good slope of the output edge, and are quite good at determining the level at the input. But the probe lines introduce their own distortions. At a frequency of 160 MHz, this is already noticeable.

However, the observation by the logic probe of periodic signals in continuous mode (then where the jitter is observed) not really necessary. You can use analog channels for such purposes. I think digital inputs are more reasonable to use in packet capture mode with a sweep trigger in normal mode or a single shot.

moelski · « **Reply #84 on:** August 09, 2021, 08:47:56 am »

Hi !
Any chance to use this probe with my Rigol MSO1104Z ?

Dominik

S. Petrukhin · « **Reply #85 on:** August 09, 2021, 12:34:48 pm »

Quote from: moelski on August 09, 2021, 08:47:56 am

Any chance to use this probe with my Rigol MSO1104Z ?

Yes, but need made inteface cabble for MSO1104Z plug.

Peter_the_diver · « **Reply #86 on:** September 26, 2021, 01:54:13 pm »

Hallo guys and thank you for that graet stuff here! I have ordered a PCB for a logic probe as described here. Unfortunately the fucking SN65LVDS1DBVRG4 is currently not availlable

. The market is swept empty - worldwide, one year delivery time! Thus I have decided to make a new board on the basis of Sergeis circuit, with the same PCB format. I have called it version 3.0. However I have used the SN65LVDS391D. This seems to be the the same LVDS driver but in a 4 channel housing. With the SIOC16 housing the routing can be structured verry well. All LVDS-lines have almost the same length now. And the best - these parts are availlable for a fair price (Mouser. DigiKey, Farnell...). Please find attached the design documents here. By the way - it is not yet tested! Feel free to use it - but on your own risk.

regards Peter

S. Petrukhin · « **Reply #87 on:** September 26, 2021, 02:46:26 pm »

A good solution, Peter!

But it seems to me that we should not worry about the length of LVDS lines in real life.
I was checking my version, where the lines have a big difference in length, on the 36 MHz SPI bus.
Didn't detect any interference or jitter.

Peter_the_diver · « **Reply #88 on:** September 26, 2021, 03:11:00 pm »

you are right Sergei - last but not least you have to consider the total lengt of the lines (driver output - ribbon cable - LVDS-input). So small differences on the little bord are negligible. However, the use of the SOIC made it pretty easy to realise this evenly routing.

Peter

S. Petrukhin · « **Reply #89 on:** September 26, 2021, 03:51:53 pm »

Yes, if we look at the photos of the oscilloscope board (good people published them in this forum), the Chinese guys do not bother with this question at all.

MegaVolt · « **Reply #90 on:** October 18, 2021, 08:03:45 am »

It showed up on ebay.
https://www.ebay.com/itm/224648789536

S. Petrukhin · « **Reply #91 on:** October 18, 2021, 08:37:34 am »

Quote from: MegaVolt on October 18, 2021, 08:03:45 am

It showed up on ebay.
https://www.ebay.com/itm/224648789536

It's funny to see a modification of my device in the commercial sector on ebay.

MegaVolt · « **Reply #92 on:** October 18, 2021, 08:40:09 am »

Quote from: S. Petrukhin on October 18, 2021, 08:37:34 am

It's funny to see a modification of my device in the commercial sector on ebay.

Yes. And the seller is not from China.

S. Petrukhin · « **Reply #93 on:** October 18, 2021, 08:54:02 am »

Quote from: MegaVolt on October 18, 2021, 08:40:09 am

Quote from: S. Petrukhin on October 18, 2021, 08:37:34 am
It's funny to see a modification of my device in the commercial sector on ebay.

Yes. And the seller is not from China.

It is ok. I have not expressed any restrictions for use, including commercial.
The seller has a good rating, good reviews - probably a good person.
In addition, only 5 pcs. - probably, this is the sale of extra copies.

If you wish to produce these probes for sale, you can safely do it without any restrictions.

Landvogt · « **Reply #94 on:** January 21, 2022, 08:40:10 pm »

Hi folks, I'm new here. It's incredible how you guys work together constructively. I was really enjoying reading through this thread

. Unfortunately, the SN65LVDS1DBVRG4 is still not available. Has anyone tried Peter's workaround yet? Did it function correctly?

S. Petrukhin · « **Reply #95 on:** January 21, 2022, 09:31:56 pm »

Quote from: Landvogt on January 21, 2022, 08:40:10 pm

Hi folks, I'm new here. It's incredible how you guys work together constructively. I was really enjoying reading through this thread . Unfortunately, the SN65LVDS1DBVRG4 is still not available. Has anyone tried Peter's workaround yet? Did it function correctly?

LVDS drivers are quite a lot from different manufacturers, both -1-channel and multi-channel. You can get them even from a broken monitor. They are all standard, differ only in bandwidth mainly. Very often they are even completely interchangeable, including by the location of the pins.

I haven't checked thoroughly, do it yourself, but I think that this CHIP can completely replace it - just install it. It is available on LCSC: https://lcsc.com/product-detail/span-style-background-color-ff0-LVDS-span-ICs_Texas-Instruments-DS90LV011AQMFE-NOPB_C130172.html But this CHIP is intolerant for 5V TTL input, 3.3V only.

I chose the most inexpensive and affordable at that time on LC SC in large quantities. Nevertheless, they work perfectly at a frequency of 36 MHz - I worked at this frequency with the SPI bus and everything was fine.

Unfortunately, the crooks have severely disrupted the semiconductor market.

giorgiofox · « **Reply #96 on:** February 20, 2022, 07:51:33 pm »

Hello,
now it seem very difficult to get all the components (at last, in Europe)
can anyone can help me with supplier or components?

Thanks in advance
Giorgio

S. Petrukhin · « **Reply #97 on:** February 20, 2022, 07:58:05 pm »

Quote from: giorgiofox on February 20, 2022, 07:51:33 pm

Hello,
now it seem very difficult to get all the components (at last, in Europe)
can anyone can help me with supplier or components?

Thanks in advance
Giorgio

https://lcsc.com/product-detail/span-style-background-color-ff0-LVDS-span-ICs_Texas-Instruments-DS90LV011AQMFE-NOPB_C130172.html

crgarcia · « **Reply #98 on:** March 06, 2022, 06:14:28 pm »

Quote from: S. Petrukhin on February 20, 2022, 07:58:05 pm

https://lcsc.com/product-detail/span-style-background-color-ff0-LVDS-span-ICs_Texas-Instruments-DS90LV011AQMFE-NOPB_C130172.html

0 In Stock

S. Petrukhin · « **Reply #99 on:** March 07, 2022, 07:34:29 pm »

Quote from: crgarcia on March 06, 2022, 06:14:28 pm

Quote from: S. Petrukhin on February 20, 2022, 07:58:05 pm
https://lcsc.com/product-detail/span-style-background-color-ff0-LVDS-span-ICs_Texas-Instruments-DS90LV011AQMFE-NOPB_C130172.html

0 In Stock

Unfortunately, the CHIP crisis problem has not been solved. I think it will be even worse, the world is changing a lot.


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Author Topic: Low cost logic analyzer probe for Rigol MSO5000 EasyEDA project (Read 80342 times)

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