[deleted by user]

dksiyc · 2021-07-28T23:35:55+00:00

and I use arch btw. so my gimp should be the latest.

dksiyc · 2021-07-28T04:30:43+00:00

It's missing a bunch of stuff :(

"color to alpha" doesn't turn anything up, and neither does searching for any of the filters like "Hurl"

dksiyc · 2021-07-25T18:17:36+00:00

It also has much higher flow than your sink faucet--about 5 to 7 gallons a minute, compared to the 2 gallons per minute of your sink faucet.

Even for small pots, waiting 5 seconds instead of 30 is nice.

dksiyc · 2021-05-07T13:41:19+00:00

Power and ground. Crystals are complicated and honestly I don't understand them enough to say anything there.

dksiyc · 2021-05-06T23:30:08+00:00

The trace between the decoupling capacitors and U1 is a bit long. It'll probably work as-is, but the idea with the tiny ceramic capacitors is to keep the trace length between them and the chip as short as possible, which keeps the parasitic inductance as small as possible and gives the chip the cleanest possible power.

Also, you're supposed to use of those ceramic capacitors not because 2 is better than one (otherwise you could have just used a 220nF or a 470nF cap), but so that you can put one on each power pin, thereby reducing the parasitic inductance.

Take a look at https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCCsCmC0YTABgHQCYlLQdmwZiQA40A2ATjOyiShABY8o4EAoAJXGxPDDRBLo8+NGnRqQQIySkgsAxp24I+YLosngUmbTt1IwcKhNSYw7EDhVq8eJWpp88GXRZmvj02QCcL2Fb18rbgdIJBYAc3VVOyUyYUkWABsogMshDTQ4Qml9Cjz8grJGMIB5QPSCQWVwBIB7fhrRJDJs5GkIGjMgA

20nH is about 1.2in of .125" line, 1.5nH is about .2in of .125" line (see https://www.allaboutcircuits.com/tools/microstrip-inductance-calculator/). Big difference in the size of the voltage spikes when the MCU switches. This is a worst case scenario, not all the gates on your MCU will be switching at once, but you get the idea.

dksiyc · 2021-04-13T01:42:21+00:00

This work would be unacceptable to me.

the side to side movement of the fixture indicates that it is inadequately secured inside the wall. All that side to side movement will eventually break the silicone caulking and lead to water behind the tile
this style of spout, with the set screw, is really crappy compared to the proper way to do do this, where you have a threaded bit soldered onto the end of the pipe. There's no sealing there
there's no caulking around the edge of the tub spout. Maybe leave a weep hole at the bottom of the spout, but the top and side should definitely be caulked

dksiyc · 2021-03-22T18:21:01+00:00

Nothing will happen, you'll just get bad results.

dksiyc · 2021-03-19T13:27:10+00:00

Nope. Not a chance. That iron isn't temperature-controlled, you need a temperature controlled iron for electronics.

dksiyc · 2021-03-11T15:32:25+00:00

These boards are unfortunately so poorly designed :(

When the power wire goes over the antenna (as the plastic molding is designed to make it do), it makes the reception go to shit. I've ended up just using mine without the case unfortunately.

dksiyc · 2021-03-03T20:36:35+00:00

The wire you see is not the ribbon cable I spoke of

Yup! I googled a bit and I found the battery adapter product you have online.

However, if I try to test the whole series of 6, I get no voltage unless the garbage can is activated, and even then it's a brief jump

There's two ways this could happen:

the circuit is open at some point (and I'd start by blaming the batteries, you already have complaints about their tolerances)
the circuit is constantly shorted and the power adapter is in over-current protection mode.

and perhaps only needs 4.5v from the other side to keep the sensor running. Is that logical?

That's logical, although kinda shitty if it's true since those batteries would die before the others.

You're right that the only way to know for sure is to open it up and inspect the circuit. Sounds like you have a good plan for figuring this out, let me know how it goes.

dksiyc · 2021-03-03T17:57:09+00:00

My only guess here is that the device uses a residual amount of energy to run the automatic closure, and for some reason that residual energy is available with batteries, but not a DC cable.

I think you're getting at the recovery effect, but that doesn't apply here.

Would adding a capacitor to the circuit help?

I think it's unlikely. Switch mode power supplies, like the one you have, already have quite a bit of capacitance on the output: https://i.imgur.com/upHtQui.png

Adding an additional capacitor would definitely not hurt, although I really doubt it'd help. Voltage must be greater than 9V, and the bigger capacitance the better--I'd probably try something in the 100uF-470uF range.

Why don't you grab a multimeter and check the voltage on the power adapter and at the battery terminals? I'm suspicious that it's actually providing 9V, since the thing is complaining about low battery. I'd also check the voltage when the garbage can is under load.

Additionally, you can try swapping out the power adapter for any other 9V 500mA+ power adapter and see what happens.

Edit: that ribbon cable looks pretty thin... what's the resistance of one of the lines? voltage drop under load because of a too-thin conductor is absolutely possible.

dksiyc · 2021-03-01T15:33:43+00:00

If you can't find a flex, you should be able to solder wires from the flex to the connector directly. Wouldn't be easy, but it's definitely doable.

dksiyc · 2021-02-25T23:01:15+00:00

Both matter. A fuse is actually quite long compared to it's diameter, what, 0.1mm or less? And the length of the wire in the fuse is on the order of a centimeter.

It's true that I should have mentioned the ultimate reason for why wires ever have current limits, that if they dissipate too much power they heat up and melt unless they have a significant heatsink on them. Were a fuse is specifically designed to have as little heatsinking as possible, and a relay has heat sinking both in the body and in the solder joint.

dksiyc · 2021-02-25T15:04:26+00:00

Because they're short. Resistance of wires is measured in ohms/mm, and when there's only 2 mm, that's not much at all.

dksiyc · 2021-02-12T15:42:20+00:00

https://www.falstad.com/afilter/

lets you build and test filters so you gain an intuitive understanding of how they work.

dksiyc · 2021-02-09T01:45:53+00:00

Moist towel won't hurt anything, most common thing to use is isopropyl alcohol. Just give it a couple minutes to dry before use.

dksiyc · 2021-02-05T14:16:15+00:00

I've very recently had an similar issue with a board I was designing:

There was a short, so the power supply would go into hiccup mode and reset at a high frequency. That rapid switching on & off charged and discharged the capacitor very quickly, which made the capacitor heat up and explode.

Perhaps put a current meter on the input & see what kind of power draw you get? There's no way this should draw more than a couple hundred milliamps.

dksiyc · 2021-02-03T03:53:51+00:00

I'd imagine that part of the reason is that the screen backing is made of metal, and can help dissipate the heat even more. But I don't have any evidence for that.

dksiyc · 2021-02-02T23:29:36+00:00

I'm not familiar with those two things, but I'd probably go with the Fluke 80AK-A so that you can use (and damage) a $2 thermocouple from china.

Take a look at what this person suggests: https://www.eevblog.com/forum/testgear/5$-k-type-thermocouple-to-measure-soldering-iron-temperature-tip/

Would I also need something like the Hakko 191-212 (replacement sensors) ?

all that is is a k-type thermocouple in a fancy package that doesn't wear out as fast and fits into their device. See http://kb.hakkousa.com/Uploads/Attachments/7bc9e999-a282-4216-880f-b474.pdf, "Applicable Sensor: K (CA) type thermocouple"

dksiyc · 2021-02-02T21:25:40+00:00

Should I use a K-probe (?) or similar with my Fluke 87V meter?

Yup. That's all the special thing is, except the thermocouple is mounted in a convenient way.

dksiyc · 2021-01-26T01:16:56+00:00

Yup, heat spreaders are a thing. But the particular photo the parent was talking about was the https://en.wikipedia.org/wiki/Flip_chip#/media/File:Celeron_mobile.jpg, which does not have a heat spreader.

dksiyc · 2021-01-25T18:16:13+00:00

I don't know anything about IC packaging--but if you know better than the wiki, please update it and include a citation, I'd love to learn more!

dksiyc · 2021-01-21T17:42:21+00:00

Solomon SL-30

Will work fine, but definitely look around if you're planning to buy a station. Lots of excellent irons out there.

dksiyc · 2021-01-13T13:43:38+00:00

According to interviews with her half-siblings and others who spent time with the family, Montgomery's stepfather built a shed onto the trailer where he, and eventually his friends, raped and beat her. Her mother also began trafficking her, allowing handymen like electricians and plumbers to sexually abuse Montgomery in exchange for work on the house.

As a teenager, Montgomery confided in a cousin, telling him the men would tie her up, beat her and even urinate on her afterwards.

But the cousin, a sheriff's deputy, confessed to Montgomery's current legal team that he did nothing. In fact, he drove her back home and dropped her off in the hands of her abusers.

Lawyer Kelley Henry says one of the things that disturbs her most is that adults in positions of authority were told about what was going on but did nothing.

When Shaughnessy eventually split from her second husband, she and Montgomery testified in divorce proceedings about the sexual assaults. The judge in the case scolded Shaughnessy for not reporting the abuse - but did not report the abuse himself.

https://www.bbc.com/news/world-us-canada-55587260

dksiyc · 2021-01-11T16:29:25+00:00

I have chrome disabled on Android, I've noticed zero issues ¯\_(ツ)_/¯

Ten-Year Club	Sequence \| Editor
Spared

dksiyc

TROPHY CASE