@ThePhoton Shift-S on top or bottom layer, drag freely, no problems

Alternatively: S; I; click-drag

I prefer the second, but automatically skip the S-I when my eyes see only Red or Blue, these days

The command hotkey path also allows, then, S-U for only touching objects, or S-O for objects outside, instead of inside

Once used to, three very, very useful commands

@KyranF Altium has got a nice importer for libraries. Works smoothly (at least for OrCAD and PADS). It saved a lot of time.

@NickAlexeev yes, it does indeed. helps transitioning from those other ones into Altium. The place I interned at indeed had just transitioned from an old version of OrCAD to Altium and was building up/transferring library of parts. Altium also supported spreadsheet/database style symbol/component libraries which was handy

Anyone know where I can find a 10 turn 10k stereo potentiometer?

every electronic shop

lol thanks

Seems like mouser doesn't have them

mouser turkey? on mouser.de I can find 18 matches...

Could you send me a link of one of them?

have you looked at the normal or prevision potentiometer ones? sometimes it helps just to google some part number and look how they characterize them

I have looked at both of them

Maybe these?

I have looked at those and those seem to be not stereo, they have only 3 pins

Those are selected for two gangs. That'd be stereo.

The datasheets are for the basic pot that can be ganged. The selected parts are ones that have two pots ganged together.

If I select for one gang, the prices drop by about half, so I expect I got them right.

you have to be careful, sometimes they have two seperate tracks that are essential put together to be one pot though

selecting for audio pots can lead you somewher too

2 gang audio is almost always those things it seems

or I was lucky in the past

hm, I wonder if there are any ATX PSUs that alternatively to their mains voltage take 12-14V input, kinda like a ups/psu hybrid

@PlasmaHH CarTX / MiniCarSupply / etc etc. But with a high efficiency 12V Adapter added to them

Or, why not go for 24V battery and use all high efficiency Buck and Inverting Buck

Can get you UPS efficiency near or even upward of 90%. Especially using more modern battery chems

Collecting options at this point. Mainly thought about car battery being convenient because I can use the same rail as the backup for wifi router, fritz box and switch

I'd imagine you want to power electronics with a somewhat stable voltage that doesn't go between 10.5 and 15V?

I don't think that is necessary, I will have to check the fritzbox but the wifi and switch can run from 10V to 30V input

So then at least 18V-ish Lithium type would work

Find the right number of cells and kind of chem and you can use any run of the mill 19V/250W Clevo adaptor for primary power

recycling cordless drill batteries?

Maybe, but you'd have to get very expensive ones or do it purely as a hobby

(i.e. no guaranteed backup)

I have been thinking about installing a low-V backup rail on some of those LiFePo cells I have because the project using them got canned

its just for my home as a backup for power outages, so in regard to that requirements are not that high

Router, Switches, ReadyNAS. But they are very distributed through a very concrete flat

I am getting some options and ideas on what is possible, like I think maybe I can use the same 12V backup rail for some emergency lighting LEDs in the stairs area

But it'd be nice to have a "10 minute git push / file copy window" at power failure

You can make all your 12V from whatever voltage

Nothing stopping you from using 96V batteries, other than the cost of HV ready made regulators

And my backup system won't be designed and ordered before 2017 as it looks now ;-)

But at upto 32V input ready made 12V or 5V at up to 20W can be had below 10 euro

20W is more than enough for emergency LEDs

My Lab is lighted mainly by 22W of LED lights of 4 generations ago

That's not backup setting, that's work setting

Only need the Loupe Lamp's Fluo/TL when working on intricate.

such as the current dense 0402 stuff

I think my entire house needs only one of my Red 3W LEDs (if the walls were transparent) for low power silent running 90's Submarine lighting

I wonder why transparent walls are not more abundant

Also Submarines refitted in the last 5 years now just use high quality white LEDs when running silent, FYI

Loadbearing glass seems to still defy most builders * shrug *

Haven't been in a sub since 2001

though they didnt change anything i lighting there when going silent

Me neither, but I keep up with what happens, since everything electronics either is my business, or could be

Depends on the sub type.

Prolonged submersion Subs generally have better, high power lighting on normal run, having the switchover for silent running, if that means turning off the main drive also generating the kWs/MWs needed to run everything

And of course, most Navy subs are that, just that when they are in the docks, they generally try to avoid having it run main drive systems :-)

@JRE @PlasmaHH Well, then the datasheets and the images are of wrong part, right?

@abdullahkahraman usually the images on the website are just examples, and the datasheet often just shows one variant and then lists ways this could be different. look at the datasheet for a list of variations on it and what htose provide

@abdullahkahraman The data apply to all of the potentiometers of that series, and are correct (electrically) whether you have one, or two, or a half dozen ganged together on one knob. The datasheet also mentions that the units can be ganged and can be ordered ganged, so they are correct. If a bit misleading on first glance.

Well, for example, this one: mouser.com.tr/ProductDetail/Bourns/3540S-1-103L/…

It says it is gangable, so should I buy 2 and gang them together physically so that I have stereo potentiometer?

And what about this one? digikey.com/product-detail/en/bourns-inc/3549S-2AA-103-103A/…

@abdullahkahraman That one says it has two gangs, so you order one of them - it is already "in stereo."

@abdullahkahraman Same deal. That part is already 2 ganged.

Hey, what would you guys think about addding a SASER tag?

@tuskiomi why?

a wtf?

@PlasmaHH another excellent question

I still don't understand why tags aren't a 10k privilege

Sound Amplification by Stimulated Emission of Radiation. It's relatively new, and has some interesting applications.

@tuskiomi how many questions have we gotten on the topic?

Without a tag, it's hard to tell....

I would guess its roughly around 0 +- 0.1

@tuskiomi Show me one question...

otherwise it's a completely moot point

because you can't make tags without a question to attach to them, and if there aren't more than 2 questions the tag will be auto-purged.

electronics.stackexchange.com/questions/137703/… electronics.stackexchange.com/questions/58277/… electronics.stackexchange.com/questions/94908/… how about those 3?

hm, nope, nope and... uhm... nope

tags are assigned by topic of the question, not by possible answer technologies

I have the suspicion that you don't know what a saser really is

its not using microphones and amplifiers, its using physics

like gas bubbles in a liquid enclosed by an electric field

@PlasmaHH haha, anything that you could name in real world has related physics. a LASER is just something that produces photons in a very narrow beam. That's it. A SASER is the same thing, with sound.

no, like the acronyms say, the process in how these are created is important too

and the important process in all of these is the stimulated emission of coherent waves in whatever medium

which gives the saser the funny property of operating at 100GHz or like those frequencies

the SER part is very broad, and not in the slightest exclusive to LASERs or SASERs. Heck, one could say fire is SER of photons.

and they wouldn't be wrong ^

I call utter bullshit on that

en.wikipedia.org/wiki/Stimulated_emission I defend my point.

stimulated emission of photons is the way most are made - electrons jumping energy levels.

@tuskiomi The key thing is the "A" in both of those. The "amplification" part. That's "Amplification by Stimulated Emission of Radiation."

If you don't got the Amplification, you ain't got the ASER.

you've got a LSER.

You got a light bulb.

Which is a damned far cry from a laser.

^quite.

I suppose, then a SASER would have to have a resonating medium to be able to be called so.

A 1Watt LED is just bright. A 1Watt laser will burn your skin or put out your eye.

@tuskiomi Which is why none of the questions you suggested would belong to a SASER tag. No "ASER" in any of them.

Hmm, I suppose not.

@tuskiomi Electrons jump energy levels two different ways, stimulated and spontaneous emission. Only stimulated emission is stimulated emission. Spontaneous emission is a different process.

And the light coming from a fire is almost entirely spontaneous emission.

@tuskiomi They would be wrong if they said that "fire is SER of photons."

@ThePhoton I would like to debate, but I don't know enough on black body radiation mechanics to continue. I've read a teency bit of a textbook (physics of light and optics, 2015 optics.byu.edu/prevtext/byuoptics13.pdf), which seems to favor it being stimulated (13.4), as opposed to spontaneous. Take it with a grain of salt, this is where my physics gets hazy. book link: optics.byu.edu/textbook.aspx

@tuskiomi What part do you think links the two? In the first paragraphs they talk about the black body absorbing radiation and then emitting radiation. But these are two separate processes, with an indeterminate time passing between them. The emitted radiation is not coherent with the absorbed radiation.

In stimulated emission, the incoming photon interacts with the electron but is not absorbed. The interaction triggers the electron to drop energy levels and emit a photon, which is in phase with the initial photon. The initial photon is never absorbed in this process.

The Einstein stuff is a bit tricky and I would have to go back and re-read to remember the details, but the basics are that because of reasons, the likelihood of a certain material in a certain excitation state undergoing spontaneous emission and undergoing stimulated emission (when a stimulus photon arrives) are related to each other.

But that doesn't mean that stimulated and spontaneous emissions are the same thing.

@ThePhoton you're talking of section 13.4, correct?

About the "Einstein stuff", yes

Hmm, like I said, grain of salt. I just read that it was equilibrium, and both types of ratiation happend, spontaneous as a postulate, and stimulated as a continuous function.

But I don't see how you get from this to "fire is stimulated emission". If you can point out what parts made you think that, I might be able to explain what you got wrong.

Because the light of fire is from black body radiation.

@tuskiomi Right, but where does it say that black body radiation is from stimulated emission?

Followed by " In addition, he postulated that some transitions must occur spontaneously"

yes. thus it seems as spontaneous emission is like a spark, and stimulated is like a flame?

^as simile, not technically speaking

morning

Imagine you have a candle in a room with the walls painted black and kept at 0 C.

The walls will be emitting (near) blackbody radiation characteristic of 0 C.

But the flame will be emitting (near) blackbody radiation with characteristic of around, say 1500 C.

The emissions from the walls, which will form the field around the flame will be mostly infrared. Any stimulated emission from this stimulus would also be infrared. But the candle flame actually emits yellow, not infrared.

So you know that yellow light is not coming from stimulated emission, it's coming from spontaneous emission.

Not that the candle doesn't also emit infrared.

But it's whole output spectrum is shifted blue relative to the spectrum of the radiation coming to it from outside.

Forgive me if this is a dumb question, but can't the flame stimulate itself?

It does a small amount, but most of the emission goes away (so you can see it standing a few feet away)

Only when you put your excited medium in a resonant chamber (between two mirrors) does the stimulated emission start to get significant.

Gotcha, well, today I learned something new. Thanks, Photon!

Sorry I couldn't be more clear.

Unfortunately I should be working.

should I post that as a question to the stack?

maybe physics.se, not here

@tuskiomi Yes, search physics se and see if it's been answered before. If not, post the question there.

You should get a better answer than I was able to give

Hello

anyone familiar with the 8051?

Worst uC ever

I've been part of making an implementation of one

ew

why are the i/o ports so freaking weird?

Also, it's a "generic" architecture implemented by many manufacturers, so my 8051 experience may not translate well.

SiLabs stuff?

nah it's an old phillips implemenation

p89c668

you guys talking about the EFM8 series of 8051 inspired micros?

pastebin.com/QbDyx6Md

i'm trying to figure out why my pins aren't toggling

code seems straightforward enough, simulator shows toggling

never really written any assembly before or at least not since a college micros class back in like '09

@abdullahkahraman I've never seen multi-turn stereo potentiometers. If you don't find it, you might consider tying 2x single ones with a timing belt.

@TheNoonMoose is the MCU working? Are you sure you actually programmed it? Is the oscillator running?

no indications that the part isn't working. i have a nice commercial programmer for these sorts of things and it programmed and verified fine. ALE is toggling once i take it out of reset so i believe the device is running

psen# is not toggling so i believe it is running internally

good news on one front, the assembler output matches my own handcrafted binary

good news, i'm definitely doing something wrong, because i tried to disable ALE from toggling and that didn't work

pretty sure it's got something to do with the upper 128 bytes of ram and the SFRs sharing the same addresses

@W5VO thanks for the thoughts, you gave me enough of a thread to pull on to work it out

sort of, since it still doesn't work lol but at least i know i was doing something wrong before

I can't remember the memory model of the 8051 without reading a datasheet

other than it was ridiculous

yeah there's definitely something of that nature going on, also the simulator i'm using is clearly not very accurate

name one simulator of anything that is accurate at all

@ThePhoton On the Peninsula, technical talks seem to be the primary networking vehicle. In San Jose, it's happy hours.

@PlasmaHH I've seen some convincing resistor simulations

@W5VO people climbing on transmission lines?

why is everyone like "you need to only use prime lenses for your dslr to make professional photos" these days...

@PlasmaHH hey man, me and spice have had some good times

@PlasmaHH They're just imitating iPhones

@TheNoonMoose until she dropped her pants?

even then

I see...

@NickAlexeev Damn, I'm doing it wrong then.

@PlasmaHH It's not the simulator, it's the model.

@ThePhoton so Falstad's ok?

(trick question)

@W5VO If you have a circuit simple enough that you can make a model of it that Falstad can handle, yes.

My Bluetooth LE gizmo is bluetoothing. By some serendipity, 2k lines of example codez stapled together manage not to crash.

@NickAlexeev did you remember to put the "expires at demo day" code path into it?

Folks, where is our canonical question for "don't use resistive voltage divider to step down power supply voltage" ?

@ThePhoton Hey :) I finally got my full adder working: imgur.com/a/NL5dh (Still working on my cable management :P) Wanted to thanks again for your help here in chat.

@Rizier123 cable management looks good enough for a breadboard. google image search for examples ^^

I think there's another one that also covers the question. But this one's easier for me to find.

@ThePhoton Thanks. I've also found this:

@PlasmaHH Thanks. Yeah I know those images are so scary that I try to never make it like this.

@Rizier123 Good job

anyone here used Lattice FPGAs and have worked out how to add the global Power Up Reset module?

specifically the ICE40 FPGA, and i'm using the IceCube2 and Synplify Pro Synthesis (and A-HDL for simulation..)

or otherwise, how do you guys implement a system-wide reset signal on FPGA start-up to ensure all states and registers are initialized to a known value?

If a question starts with "So", that's already about -0.5 in my mind.

@KyranF Depending on synthesis tool, it might just respect the initial values in your code.

For example, in Verilog

reg test[1:0] = 2'b11

@ThePhoton after a huge amount of googling, that seems to be the thing i should do

I am having "intended" results with A-HDL simulation, but when I flash it to my FPGA dev stick it seems like only half or less of the functionality is there. The simple FIFO buffer's "empty" LED is not lighting, yet my LED "blink" module is definitely still operating correctly. sigh

so i'm thinking it's a reset or state that is simulating properly but in hardware isn't firing

@KyranF For sure you need to check in the synthesis tool docs what's the preferred way to get the desired state after reset.

Also if you do

reg test[1:0] = 2'b11

and then

always @(posedge clk or posedge rest)

if (reset) test <= 2'b00

...

Then the tool isn't going to know what you want.

@Asmyldof, I (well, my colleague) found the schematics for L22 XPlained board.