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MS05000 Budget Logic Analyzer Probe Set Design

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WattsThat:
Just finished. Only built one each of the logic boards for starters, I have no idea why I did that. Had to get out the microscope, *%^@#&!#! fricken 0603's. The only thing I did wrong was installed the red LED backwards, thankfully I had a replacement as it went flicking off into who the hell knows where.

Thank you! Now I have to learn how to use my scope (in LA mode).

Gandalf_Sr:
Looks really nice WattsThat!  Thanks for posting the pictures.  Uner my microscope, 0603s look HUGE

WattsThat:
Yeah, they were ginormous in my scope as well but it was because I had the 20x eyepieces in, had to put in the 10x  :scared:

I didn’t think about assembly order and followed your notes, I think for the next set of boards I’ll install U5 first, then the caps around it, especially C11. It was a little tight in there... I use a big tip as well, 1/4” Pace knife tip and it was, well, difficult.

Surprisingly, I had some issues with the EING solderability, especially just on U1,2 and 3, after the first board gave me fits, I pre-tinned the pads and then cleaned off with solder-wick, then it was easy. I also had issues with the thermal vias on the gnd pins of those chips, had trouble getting things to flow, probably just my tip temp being too low. Maybe that was the issue altogether, dunno, never had issues like that before with that finish.

All in all, it was very rewarding and I guess I saved about $300, all said and done. Just need to order the balance of the parts and finish the other two boards, have plenty of time these days as I’m on a week, off a week at work until the end of June. Damn virus. Half salary too. But, there’s no excuse not to get some projects done. Time, I’ve got, right now.

Edit: now that I look at the photos of the boards, I can see where I lifted bits of the solder mask on U1/2/3 on the 5V board which was the first board I did. That was from all the horsing around with wick trying get a good flow on the pins.

Gandalf_Sr:
When you're doing solder wicking, you need to crank up the temperature a bit, I run at 300 C. The last thing you want is the solder on the wick sticking to legs and pads as you pull it away.  Anyway, it looks like you got it all working.

I'm the same here work wise (although I work for myself - from home), my clients take 2 or 3 days to answer simple questions so I doubt I have 15 hours a week billable, and then they have to pay me!

I had a client last year that left me unpaid for almost $10,000 - I doubt I will see that ever.  I have 80 of their PCBs - assembled by CM - but they aren't seeing any of them until I get paid.

Selling stuff on eBay is also frustrating, they hang onto my money for weeks and then charge me 10% for the privilege >:(

electricMN:

--- Quote from: Gandalf_Sr on April 19, 2020, 09:48:49 am ---Has anyone I sent the PCBs out to built their LA probe set yet?  Pictures please!

--- End quote ---

Haven't started yet. Been sick for the past couple of weeks. Not coronavirus, thankfully. BP issues which seem to be resolved now. Finally getting some spunk back so will probably tackle those boards this week. I'm finishing up building a 40m ham radio.

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