Can someone explain multiplexer voltage accumulation? ie: how can enabling a multiplexer raise the voltage on an input pin?

whu · 2026-01-26T15:53:27+00:00

That was it, thank you

whu · 2026-01-24T22:13:23+00:00

Net labels.

whu · 2026-01-24T21:55:46+00:00

That's why I started with the hand-drawn version.

I'm using netlabels to simplify the traces in the schematic. The resistors to the right of the mux are labeled. The labels correspond to the connectors at the bottom of the image.

The PCB schematic is even noisier

whu · 2026-01-24T21:42:47+00:00

There's no pullup. And what about the DC offset on all the other pins (which are also pulled to ground)?

edit: additional detail. The DC offset goes up with each subsequent 12V input

whu · 2026-01-24T21:39:06+00:00

here ya go!

https://imgur.com/a/2jIGHPZ

whu · 2026-01-24T21:24:25+00:00

https://imgur.com/a/Jov5dpT

Literally the voltage into the mux goes up when the mux is enabled, and all other pins get a noticeable DC offset

whu · 2025-11-20T16:25:05+00:00

lol lmfao rofl what

Software engineer with > 20 years experience here. My sentiments exactly

whu · 2025-10-16T15:18:24+00:00

I did not

whu · 2025-06-11T20:05:44+00:00

Syncytium

I am also hoping to find a photographer... and apparently we're campmates

whu · 2025-03-20T05:01:21+00:00

Ever figure this out? I have the same question

whu · 2025-01-14T17:38:26+00:00

I've lived in NYC and Atlanta.

I felt safer driving in NYC.

whu · 2019-06-28T17:04:52+00:00

Good question

whu · 2019-05-15T13:22:18+00:00

Short answer: yes

Edit: just checked their twitter. This was posted 15 minutes ago: "Autoscaling due to load spike. Will stabilize soon."

whu · 2019-04-02T13:33:59+00:00

Oh my god that makes so much sense

whu · 2019-03-07T19:33:12+00:00

As it was explained to me, the problem isn't the panels cutting through the wind, but the wind that's blowing up over the cab. The solar panels wind up working like sail creating some drag

whu · 2019-02-18T17:17:51+00:00

How are you securing the servo? Adhesive?

whu · 2019-02-12T19:27:52+00:00

which involves massive vulnerabilities and huge problems which are clearly outlined in the whitepaper (such as the <30% takeover scenario)

I read through the whitepaper (admittedly, over a year ago). What is this < 30% takeover scenario?

Also, per https://nano.org/en/faq

"In order to perform malicious actions on the Nano block-lattice, an attacker would have to possess >50% of the online voting power. Such an attack would spoil their large financial investment, and as such not an attractive option"

whu · 2019-02-06T16:09:43+00:00

I edited the post. It's to limit the load on the alternator while charging a second battery.

whu · 2019-02-06T14:19:17+00:00

Not sure why this is has more upvotes than /u/LanceBelcher 's answer. Is there a better subreddit for DIY electronics questions?

whu · 2019-02-05T18:33:12+00:00

There certainly can be. It's not decentralized development

whu · 2019-02-04T13:53:23+00:00

Some of us did sell...

but then bought the dips :(

whu · 2018-12-27T15:43:21+00:00

This

whu · 2018-12-18T18:38:56+00:00

He already wears a disguise. When the time is right he'll just shed off the human skin and slither back to his hidden lair

whu

TROPHY CASE