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Upgrading our community’s platform

Reply #20 — Posted 1yr ago
by Brett | Superhuman | 125,590 exp
Reply #20 — Posted 1yr ago
by Brett | Superhuman | 125,590 exp
bigly big, that's how big!
Reply #21 — Posted 1yr ago (modified)
by stotech | Senior | 1,926 exp
Reply #21 — Posted 1yr ago (modified)
by stotech | Senior | 1,926 exp
I'm posting here cause this is the only thread I could get access to.

Please help. I've just put together a prototype for a board I'm making based on a g120. Everything about it seems ok but the noise on the 3v3 rail is completely ridiculous and I can't nail it down. It's just below 1V and is at 28khz! I'm NOT[edit Smiley] ruling out that I've stuffed this prototype somehow. But the noise is only there when the g120 is running? If I press the reset button for the g120, it's fine for a few seconds and then starts again? any ideas where I should go next?

Thanks in advance.

Update..... I think it is something in my power supply design. If I remove the g120 and simulate the approximate load. I get almost as evil a result.
Reply #22 — Posted 1yr ago
by Brett | Superhuman | 125,590 exp
Reply #22 — Posted 1yr ago
by Brett | Superhuman | 125,590 exp
I was going to say.... to me it just sounds like power supply noise coming thru and I'd look at specifically what capacitance you have around the place trying to deal with that (but not really doing the job).
1 like
Reply #23 — Posted 1yr ago
by stotech | Senior | 1,926 exp
Reply #23 — Posted 1yr ago
by stotech | Senior | 1,926 exp
Here are the gory details of where the mysterious 28khz comes from even though the lm3671 has a frequency of 2M. This really annoying feature called PFM mode.

It does this to save the battery below a certain current, check out the spec sheet for more details. http://www.ti.com/lit/ds/symlink/lm3671.pdf

Not sure how to make this work with my ADC's. I might change to this one which is a drop in.
http://www.semtech.com/images/datasheet/sc189.pdf

Thanks again, I'll check back in if I can fix the issue.
8 likes
Reply #24 — Posted 1yr ago
by suitable1 | Master | 7,672 exp
Reply #24 — Posted 1yr ago
by suitable1 | Master | 7,672 exp
Please, please, please correct the banner.

It's "your seat" not "you seat".

Meantime in this context is one word; "mean time" is used in a phrase like "mean time to failure".
1 like
Reply #25 — Posted 1yr ago
by devhammer | Legend | 55,820 exp
Reply #25 — Posted 1yr ago
by devhammer | Legend | 55,820 exp
@suitable1 -

"Hold on to you're seat!"

You have just been trolled.

I'd have to guess that @Gary is behind it. Although the words are right-side up, so that might implicate someone else. ;-)
1 like
Reply #26 — Posted 1yr ago
by Mr. John Smith | Legend | 42,263 exp
Reply #26 — Posted 1yr ago
by Mr. John Smith | Legend | 42,263 exp
Poor Gary. What must you do to escape that label. Embarrassed
1 like
Reply #27 — Posted 1yr ago
by devhammer | Legend | 55,820 exp
Reply #27 — Posted 1yr ago
by devhammer | Legend | 55,820 exp
Mr. John Smith says:
Poor Gary. What must you do to escape that label. Embarrassed

Dunno...but guessing he'll try making another list. Cheesy
3 likes
Reply #28 — Posted 1yr ago
by Mike | Superhuman | 82,265 exp
Reply #28 — Posted 1yr ago
by Mike | Superhuman | 82,265 exp
I think the delay in getting to the new site up is the complexity of developing the algorithm to detect upside down photos and doing auto correction.
1 like
Reply #29 — Posted 1yr ago
by Brett | Superhuman | 125,590 exp
Reply #29 — Posted 1yr ago
by Brett | Superhuman | 125,590 exp
you're Grin Grin Cheesy Cheesy .

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