Products > Test Equipment

LaPOD: Low cost Logic Analyzer probe for MSO5k, DHO900 and more!

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ebastler:

--- Quote from: UK on November 05, 2023, 04:46:57 pm ---
--- Quote from: ebastler on November 05, 2023, 07:41:48 am ---C168715 looks like the only LCSC part which is meant to be mounted that way.

--- End quote ---
Here you go, C5204145 , C2682172 and short one C711353 ;)

--- End quote ---

Oh, nice! It is reassuring to see that there is a larger selection. I had scanned through the thumbnail pictures too, not trusting LCSC's keywords, but did not see (or recognize) those.

I wonder what the "brick nogging" tag means? Is that a standard industry term or the unexpected result of a Chinese-to-English translation?


Edit: Ah....


--- Quote from: niconiconi on July 21, 2022, 07:56:24 pm ---As a native Chinese speaker, "brick nogging" is gibberish and completely incomprehensible to me. :-DD  I was curious and just looked it up, apparently it was a mistranslation of "立贴".
"立" means "standing" or "vertical", and "贴" is the short-hand for "贴片", which means "pick-and-place" or "SMD", so it just means "vertical SMD".

--- End quote ---

oliv3r:
So here's the new LM7324 POD with the capacitors hugging the chip as closely as possible.

One thing I just came to realize though, is that the pin-order on the POD's are all 3, 2, 1, 0. This was due to the breakout board, swapping that order makes routing really really hard, as all lines cross each other. I don't know how the original pod solves this, or if the order is also backwards? But the solution is of course simple, flip the pod around :) but that puts the led on the bottom, and since I don't want to do dual-sided components ... maybe I'll do the leds on both sides ....

Flipping the connector btw won't help that much, because it's a side-entry connector, so flipping it just puts it up-side down, but pin 0 is still on the right ...


--- Quote from: UK on November 05, 2023, 04:46:57 pm ---May be I missed that but why you didn't route channels D0 and D16?

--- End quote ---

I don't understand, they are routed aren't they?

ebastler:

--- Quote from: oliv3r on November 06, 2023, 01:47:12 pm ---So here's the new LM7324 POD with the capacitors hugging the chip as closely as possible.

One thing I just came to realize though, is that the pin-order on the POD's are all 3, 2, 1, 0.

--- End quote ---

Cool, that layout looks really nice and tight now!  :-+

I would not worry at all about the bit order. To the contrary: Isn't that how multi-digit binary numbers should be written, low bit on the right?  :)

UK:

--- Quote from: oliv3r on November 06, 2023, 01:47:12 pm ---I don't understand, they are routed aren't they?

--- End quote ---
I've read the mask on the board with mini-HDMIs - 1-3,4-7,9-11,12-15... looks like 0 and 8 are missing


--- Quote from: oliv3r on November 06, 2023, 01:47:12 pm ---One thing I just came to realize though, is that the pin-order on the POD's are all 3, 2, 1, 0.

--- End quote ---
I forgot to tell you last time, that the length of the PCB should be extended for proper placement of the 8p socket, since it has to be lying on the PCB (at least half of it) and not floating in the air. Because anyway we have this empty space in the shell under the 8p socket. So then if the length will be extended and we get additional PCB space, why just not reroute the pins order on the PCB backside like this?

After all, we have 6 spring-connection points for each channel, so 2 more VIAs should not drastically affect on the signal.

oliv3r:

--- Quote from: UK on November 06, 2023, 03:36:03 pm ---
--- Quote from: oliv3r on November 06, 2023, 01:47:12 pm ---I don't understand, they are routed aren't they?

--- End quote ---
I've read the mask on the board with mini-HDMIs - 1-3,4-7,9-11,12-15... looks like 0 and 8 are missing

--- End quote ---
ohh, fair point, the silkscreen is wrong :)


--- Quote from: oliv3r on November 06, 2023, 01:47:12 pm ---One thing I just came to realize though, is that the pin-order on the POD's are all 3, 2, 1, 0.

--- End quote ---
I forgot to tell you last time, that the length of the PCB should be extended for proper placement of the 8p socket, since it has to be lying on the PCB (at least half of it) and not floating in the air. Because anyway we have this empty space in the shell under the 8p socket. So then if the length will be extended and we get additional PCB space[/quote]
I wanted to keep the PCB length <5cm because that's where you get the cheaper rates with the board houses, or you can put 2 on a 10x10 board :)
I realize its floating in mid air, and would only be held in place by the solder and the housing, which is a bit weird, but just more economical I suppose. I can now put 3 pod designs on a 10x10 PCB order


--- Quote from: UK on November 06, 2023, 03:36:03 pm ---, why just not reroute the pins order on the PCB backside like this?

--- End quote ---
To flip the order? Yeah I was thinking that too, though it would also mean length matching traces again etc. And, having a MSB - LSB layout isn't that bad :p


--- Quote from: UK on November 06, 2023, 03:36:03 pm ---After all, we have 6 spring-connection points for each channel, so 2 more VIAs should not drastically affect on the signal.

--- End quote ---

Yeah, I'll sleep on it some, though those connection points etc are all on those differential channels. This is now on the 'more anloguey' input. fair nuff, it's a digital input in the end, so an additional via won't hurt of course.

So it would end up something (a little prettier) like this, length matching should be duable, I just don't like the fact that I have to use really thing traces now (0.25mm), because much more won't fit between those pins of course ...

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