Products > Test Equipment

DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes

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oz2cpu:
> I'm probably better off cancelling the deal via the eBay resolution service since by his own admission, it hadn't been "as described".

YES you are, Better just order the propper 4 layer pcb from jlc
order 10 set of each type, and offer to sell the propper design to others, feel free to use this page,
and please twist the cables as explained in the thread

what makes me sad and confused is : why would someone take this design,
modify it to the worse, forget to place link refferance to the design origin as required,
and with out change explain, sell it as the original, he even write 4, on the bottom layer, while the correct number should have been 2,
this is only a cover up stunt, i am not so happy with this.
it is my good name and reputation that is poluted,
when the end user get stuff that is not as expected..

Johnny B Good:
@rogersstuart

 I gather from this that you are the eponymous atomicfrenzy I've been exchanging messages with via the user hostile evilBay messaging system (which seems to have sent my last 'thank you' reply to the bit bucket).

 That being the case, I'll repeat the gist of that message here, taking the opportunity to thank you for swiftly cancelling the purchase and refunding my Paypal account. I have no reason to bear you any ill will since you'd resolved our disagreement in a timely and honourable fashion.

 I think the only mistake you'd made was in trying to cut costs on the main PCB in order to hold the end price down. Here, I think you'd made a rod for your own back when you consider that passing on the higher cost to the end customer is allowed by the licensing terms provided by oz2cpu and the kit price was only two thirds that of the shipping costs alone to begin with (to Europe and the UK at least) where the resulting 50 dollar total still only represents a mere 11.6% of the full £360 asking price (one whole SDS1202X-E's worth in fact!) of the Siglent kit here in the UK.

 As I also mentioned in that now missing reply, should you ever decide to replace the two layer board with the four layer one as per oz2cpu's original design, I'd be only too happy to buy from you again despite the fact that it'll likely add another 5 dollars or so to the kit price.

tautech:

--- Quote from: rogersstuart on December 30, 2021, 08:31:10 pm ---@Johnny B Good

I was pondering this for a bit and decided to take a look at the original files. I think I know where the confusion came from.

In his (oz2cpu's) original design there was no ground fill on the top and bottom. If this had been made by simply omitting the inner layer gerber files then it would have not worked. When I edited the files I added a ground pour to the top and bottom to add a continuous ground throughout. If this was a microwave circuit then it would have not been appropriate to do so without net via shielding and recalculating the width of the traces. But for the frequencies involved I feel like it was appropriate and the coupling between the sides is insignificant compared to the input impedance. The only concern you should have is about the ribbon cable. But I do mention in the listing that it was designed for 120 ohm cable and that I did not include it, so I feel like I was being fair by mentioning that.

I don't want to get into an argument about international law here. Suffice it to say, I am well within my rights to reproduce a non-patented hardware design or take inspiration from one. Your concern should only be if I am attempting to defraud you, which I'm not. I have tested this and it works. That's all I can say to convince you. Really, all you had to do was test it and talk to me. I have had to work with people who have burned PCBs with a torch and want a refund. If you buy it and it doesn't work then deal with me that way. Starting with accusations is not productive between a buyer and a seller.

--- End quote ---
You're advertising: Siglent SPL2016 Compatible DIY Logic Probe
That it certainly isn't ! ! !

While it may fit a SDS2000X+ DSO and behave similar to SPL2016 it can in no way challenge the original performance.
Best you have a squiz at the specs here:
https://siglentna.com/wp-content/uploads/2021/05/Digital-Probe-Datasheet-V20E201912.pdf

FYI, original SPL2016 are supplied with 20 quality grabbers and not some POS grabber that falls of if you sneeze on it.
Offering a cheap low level substitute DIY MSO probe that fits a SDS2000X Plus would be well advised rather than mention of SPL2016.

2N3055:

--- Quote from: rogersstuart on December 30, 2021, 08:31:10 pm ---@Johnny B Good

I was pondering this for a bit and decided to take a look at the original files. I think I know where the confusion came from.

In his (oz2cpu's) original design there was no ground fill on the top and bottom. If this had been made by simply omitting the inner layer gerber files then it would have not worked. When I edited the files I added a ground pour to the top and bottom to add a continuous ground throughout. If this was a microwave circuit then it would have not been appropriate to do so without net via shielding and recalculating the width of the traces. But for the frequencies involved I feel like it was appropriate and the coupling between the sides is insignificant compared to the input impedance. The only concern you should have is about the ribbon cable. But I do mention in the listing that it was designed for 120 ohm cable and that I did not include it, so I feel like I was being fair by mentioning that.

I don't want to get into an argument about international law here. Suffice it to say, I am well within my rights to reproduce a non-patented hardware design or take inspiration from one. Your concern should only be if I am attempting to defraud you, which I'm not. I have tested this and it works. That's all I can say to convince you. Really, all you had to do was test it and talk to me. I have had to work with people who have burned PCBs with a torch and want a refund. If you buy it and it doesn't work then deal with me that way. Starting with accusations is not productive between a buyer and a seller.

--- End quote ---

There is no confusion. You took well made board and fiddled with it making it worse. Designer is an engineer and several others made the copy and verified design. It is good. Proven.

Removing inside ground planes completely destroyed AC return paths underneath the signals. Pouring ground on top did nothing except added DC return path. Sampling frequency and repetition frequency of signals on DUT doesn't matter. Only rise/fall times matter and even with Arduino pins you can get frequency spectra up to 1 GHz, believe it or not.. Raspberry PI has sub nanosecond edged on it's pins, it's even faster. This induces ground bounce, crosstalk and ringing. Thomas spent time designing this with good signal integrity, and did a decent job of it.  There were some other attempts and they could see spurious pulses and noise that is not there. Not with oz2cpu though. It works well.

Designer doesn't mind you making boards and selling them for those who cannot be bothered to order them by themselves. All you needed to do was make them EXACTLY how they were designed, and somewhere in text give design credits to him... And they would work really well.. And I bet you that someone would mention it here as an good purchase option and you would get additional sales..

rogersstuart:

--- Quote from: tautech on December 30, 2021, 09:01:41 pm ---
--- Quote from: rogersstuart on December 30, 2021, 08:31:10 pm ---@Johnny B Good

I was pondering this for a bit and decided to take a look at the original files. I think I know where the confusion came from.

In his (oz2cpu's) original design there was no ground fill on the top and bottom. If this had been made by simply omitting the inner layer gerber files then it would have not worked. When I edited the files I added a ground pour to the top and bottom to add a continuous ground throughout. If this was a microwave circuit then it would have not been appropriate to do so without net via shielding and recalculating the width of the traces. But for the frequencies involved I feel like it was appropriate and the coupling between the sides is insignificant compared to the input impedance. The only concern you should have is about the ribbon cable. But I do mention in the listing that it was designed for 120 ohm cable and that I did not include it, so I feel like I was being fair by mentioning that.

I don't want to get into an argument about international law here. Suffice it to say, I am well within my rights to reproduce a non-patented hardware design or take inspiration from one. Your concern should only be if I am attempting to defraud you, which I'm not. I have tested this and it works. That's all I can say to convince you. Really, all you had to do was test it and talk to me. I have had to work with people who have burned PCBs with a torch and want a refund. If you buy it and it doesn't work then deal with me that way. Starting with accusations is not productive between a buyer and a seller.

--- End quote ---
You're advertising: Siglent SPL2016 Compatible DIY Logic Probe
That it certainly isn't ! ! !

While it may fit a SDS2000X+ DSO and behave similar to SPL2016 it can in no way challenge the original performance.
Best you have a squiz at the specs here:
https://siglentna.com/wp-content/uploads/2021/05/Digital-Probe-Datasheet-V20E201912.pdf

FYI, original SPL2016 are supplied with 20 quality grabbers and not some POS grabber that falls of if you sneeze on it.
Offering a cheap low level substitute DIY MSO probe that fits a SDS2000X Plus would be well advised rather than mention of SPL2016.

--- End quote ---

Siglent SPL2016 Compatible DIY Logic Probe

Think please.

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