9 votes

ADC stops functioning when cold

Given you have systematic failure across two different batches made in different ways, I think it is less likely to be a manufacturing issue. Still possible though. Two other possible causes came to ...
user avatar
6 votes

ADC stops functioning when cold

TL;DR: The ADC is on an analog ground plane that is connected to the digital ground plane by a single segment 10 mil trace, about 1.3" away from the ADC, away from digital signals straddling the ...
user avatar
5 votes

How to use panel-mount connectors where the nut goes on the inside of the panel

The second jack shown can be furnished with a ‘pigtail’ connector with a wire-to-board plug, which then plugs into the board. You may not like it, but this approach is very common. What’s inconvenient ...
user avatar
  • 40.2k
5 votes

ADC stops functioning when cold

Change of behaviour due to temperature variations may also be due to timing issues on the digital interface. I would suggest you review the implementation of the digital interface (clock speed, clock ...
user avatar
4 votes

Best practices for soldering a larger wire to a smaller connector/terminal?

The best practice is to use the correct cable/connector sizes, period. Everything else falls under the category "dirty hacks/lab junk", including: It is bad practice to forcefully twist the ...
user avatar
  • 13.6k
4 votes

ADC stops functioning when cold

It’s probably a bad solder joint but it could also be a damaged plastic package. You can find an entire application note on dealing with that particular package here. Note that the typical reflow ...
user avatar
3 votes
Accepted

How to use panel-mount connectors where the nut goes on the inside of the panel

For this application, where you don't have a lot of room to attach a connector (or want to drop $300 on a crimper), there's a category of connectors called wire-to-board, which is exactly what it ...
user avatar
  • 6,540
3 votes
Accepted

Should I use heat shrink tubing on solder connectors?

Generally, when doing things by the book/IPC, then shrink tube should not be necessary on DB9 solder cups, because the need for them implicitly means that the solder job was botched somehow. Common ...
user avatar
  • 13.6k
2 votes

LM393 soldering station

This is a time-proportioning temperature controller, so multiple controller output transitions are expected within the proportional band. U1B is an oscillator that provides the timebase. Assuming the ...
user avatar
2 votes
Accepted

Reflow soldering with temperature-sensitive components and without a reflow oven

Thanks for the suggestions, especially @user1850479 . I put a glass petri dish above the component to create a kind of hothouse and then set the whole thing on the hotplate. I set the hotplate to 270 °...
user avatar
  • 10.2k
2 votes

ADC stops functioning when cold

After several months dealing with this issue, the moment of realization came to me at 4 AM as I was drifting off to sleep. The SYNC Line The ADC has an external synchronization feature that allows ...
user avatar
1 vote
Accepted

Mysterium Keyboard ATmega32a malfunctioning. "USB device not recognized."

I soldered everything up [...] Not enough. You also need to program the µC chip. The device is detected via th 1.5k resistor on the D- line. The error message from the OS is because the controller ...
user avatar
  • 9,608
1 vote
Accepted

LM393 soldering station

The lack of hysteresis in a comparator is a typical issue for slowly-varying signals. You can solve the problem by bringing a bit of positive feedback via two resistors: when the output starts ...
user avatar
1 vote

Best practices for soldering a larger wire to a smaller connector/terminal?

As stated before, any use of a wire whose gauge is larger than the receptacle would be a hack. You could, however, use crimping pins(not the sort mentioned earlier which are meant for connecting two ...
user avatar
  • 827
1 vote

Best practices for soldering a larger wire to a smaller connector/terminal?

The industry standard that covers this - IPC/WHMA-A-620 - explicitly forbids severing individual strands in stranded wire and does not allow for wire strands outside the cup of a solder terminal, so ...
user avatar
  • 6,540
1 vote

Should I use heat shrink tubing on solder connectors?

you don't use heat shrink tubing on connectors This should come with a explanation. Why did he suggested not to use heat shrink tubing? Should I use heat shrink tubing on each pin or not and why? ...
user avatar
1 vote

Can extra long pads cause problems?

Great answers. The only thing I didn't see mentioned: You may ask yourself, isn't a trace just.. a really long pad? What differentiates a trace from a pad? Other than width, the biggest thing is ...
user avatar
  • 3,012

Only top scored, non community-wiki answers of a minimum length are eligible