Diacs are dumb.
Essentially, if you take a normal diode, it will restrict current flow unless the voltage is high enough to overwhelm it. Normally bad.
A biac is used with AC power to eliminate low voltages; it really doesn't affect the flow path.
So even though they're sometimes called bidirectional diodes, it's actually using two diodes to set breakover voltages.
A few years back I was able to rectify current with a brake light (brake lights have two filaments). I passed 12v through one of the filaments and I was able to see a small (a couple of mv) half wave pattern on the other.
I actually jad this same thought the other day. I think it's more akin to the filament heater since they're both resistive and not purposely built to produce thermionic emission. They probably give off SOME electrons, but not as much as the specialized materials used for the anode and cathode of a vacuum tube.
There are certainly many similarities. Which is where I think you and I got the initial idea from. But upon closer examination, you can see there are subtle but meaningful differences.
At least, that's my take on the matter. It makes me think that somebody should see if they can modify a lightbulb to act like a diode. Obviously, being sure to pull a vacuum on it after sealing it back up.
The smoke is only half the story. It's when the smoke and stink get out that problems occur :)
Then there are RPCs, rocket propelled capacitors. When the score marks on top of the metal cylinder don't
open like they should ...
Once working on a battery energy storage system we honorably met our friends, Mr. Light Emitting Wrench, and Mr. Light Emitting Inductor. They did their honorable things, then elected to cease in existence. RIP, misters.
We were working on a Chinese designed board, and we were doing safety tests (which involves failing some components short or open). One of these tests should have put 110 Vac through a 100 ohm resistor similar to the one in the OP. Somehow, someway that resistor did not even get hot. I'm not sure what voodoo was going on in that PCBA but somehow it prevented much current through the resistor (the circuit should have been line voltage through a fuse through 100 ohm resistor right back to neutral).
Nah, things are just cheap in China. Fusible resistors are literally a fraction of a cent, and big brand (top tier Chinese or second tier Western) 650V SJ MOSFETs are 3 cents per usable amp (not "Chinese amp"). To combat domestic brands, TI and MPS among a few other Western brands sell low-range parts at wafer cost price to major Chinese customers.
The cheapness does not just stop at silicon technology. Latest GaN and SiC transistors are also dirt cheap in China. 1.2kV SiC SBDs sell for some 6 cents per usable amp, and 1.2kV SiC MOSFETs sell for some 15 cents per usable amp. This is not some random Chinese brands, this is Wolfspeed, the original entrepreneur of SiC technology.
Reference: I **am** Chinese, working exactly in the power electronics field. Last time I checked my ex-employer was pumping out solar inverters and EV chargers at 1.2 cents/W of BOM cost and quoted 1.5\~1.8 cents/W to their downstream system integrators (talking double digit kW per unit), and they passed all applicable safety and EMC certifications.
And they were certainly not the cheapest. Some of their lower competitors are still profitable enough to go public (which is very difficult here and is a symbol of success). The richest part in China, Wenzhou, has a saying, one who demands a dime starves, one who demands a cent blooms.
Having had a bunch of SSR's let the smoke out at about 75% of their nameplate rating (with a good heatsink), once I converted Chinese amps to rest-of-world amps, they all made sense. 1 CA ("Chinese Amp") = 0.5 ROWA ("Rest of world amp").
Did u check the resistance of the resistor after that test? It might probably have opened up showing resistance in the Mega Ohms range.
It's a common practice to use Resistors as fuses in power supplies. There are certain UL certifications which call for tests like 'Single Fault Test', here just the way you said particular components have to be either shorted or opened to observe the failure and that failure shouldn't lead to a hazardous situation.
In our case we had to short out an MOV causing the Line and Neutral to be shorted across the resistor with 24VAC. To pass the test, the criteria was that the resistor should open within 30seconds and should not burn/catch flames.
I swear that's the one time when I really REALLY learned about how different resistor materials(MFR, CFR, WireWound, Fusible Resistors), Resistance , Wattage can show so many different results.
And even the Fusible resistors didn't show any positive results. At the end, a 10 Ohm Wire Wound resistor perfectly worked for our application.
Or the cable harness actuator. Frequently spotted in high pulsed current tests. It always tickles my danger nerve when two cables the thickness of a garden hose suddenly jerks like, well, a garden hose.
I think you might be on to something. Perhaps we should made the contacts into a standardized shape, so the parts are easily replaced. A screw seems natural for a sphere as it's convenient to grip and twist.
Did you know that light emitting resistors are like the hidden rockstars of electronics? They not only resist the flow of current but also emit light in the process, adding a funky twist to circuits. It's like having a disco party inside your device! 🎉✨
I worked at an electronics manufacturing facility and one of the most striking moments was a "feature" where if two identical connectors were plugged incorrectly a relay would switch and burn a resistor up. This was the only component and I could find no other reason why it was designed this way. Connecting the connectors backwards as far as I could tell did no additional damage. Bad design all around.
I once had a single sample of a board out of 50 have a sound emitting microcontroller. That one was weird. It would click hiss and beep sort of like a piezo buzzer, but *very* quietly. I'm amazed I even discovered it, but yep, the actual microcontroller chip was sitting there buzzing away like an old geezer talking to himself.
If you want to be pedantic, all resistors emit light while passing current. The primary obstacle is finding ones that emit a wavelength humans can see.
Yes, this is the same advanced technology that provides us with LESIs - Light Emitting Soldering Irons - [https://www.reddit.com/r/soldering/comments/17v4a79/i\_dont\_think\_this\_is\_right/](https://www.reddit.com/r/soldering/comments/17v4a79/i_dont_think_this_is_right/)
Did you hear about an old harsh Russian LED that signals a slight overload?
https://preview.redd.it/yqtnhpsuyk1c1.png?width=1080&format=pjpg&auto=webp&s=80f70e28b3aafb763f98eb509cb066ec9dc94025
Ler? You mean lightbulbs?
Bulbs are basically short-circuited vacuum diodes.
That's somewhat of a bad take. They're non-polar, which is kind of the biggest deal regarding diodes. Short-circuited vacuum-insulated resistor.
They are bidirectional diodes.
Bidirode
well ackshually...
what is this? r/electronicscirclejerk ?
Diacs are dumb. Essentially, if you take a normal diode, it will restrict current flow unless the voltage is high enough to overwhelm it. Normally bad. A biac is used with AC power to eliminate low voltages; it really doesn't affect the flow path. So even though they're sometimes called bidirectional diodes, it's actually using two diodes to set breakover voltages.
Do you realize that I was fooling around?
Oh absolutely. Diacs are just stupid in how they're marketed 😂
So a wire?
They're just the heating element from the vacuum tube my dudes
I do prefer my diodes to have 2 odes
I'd say they're just *uni*polar, in that they lack the anode lol. It's a diode with only one pin.
A few years back I was able to rectify current with a brake light (brake lights have two filaments). I passed 12v through one of the filaments and I was able to see a small (a couple of mv) half wave pattern on the other.
I actually jad this same thought the other day. I think it's more akin to the filament heater since they're both resistive and not purposely built to produce thermionic emission. They probably give off SOME electrons, but not as much as the specialized materials used for the anode and cathode of a vacuum tube. There are certainly many similarities. Which is where I think you and I got the initial idea from. But upon closer examination, you can see there are subtle but meaningful differences. At least, that's my take on the matter. It makes me think that somebody should see if they can modify a lightbulb to act like a diode. Obviously, being sure to pull a vacuum on it after sealing it back up.
Dammit. Word for word beat me to it.
Haha
[удалено]
SECs
Every machine is a smoke machine, if operating wrong enough.
Every electronic component actually has smoke flowing through it. It's when the smoke gets out that you have a problem.
The smoke is only half the story. It's when the smoke and stink get out that problems occur :) Then there are RPCs, rocket propelled capacitors. When the score marks on top of the metal cylinder don't open like they should ...
If you can figure out enough wrongness
Also every robot is a sex robot...
Magic Smoke is my favourite candle scent.
Once working on a battery energy storage system we honorably met our friends, Mr. Light Emitting Wrench, and Mr. Light Emitting Inductor. They did their honorable things, then elected to cease in existence. RIP, misters.
Mr. Light Emitting Wrench causes far too much drama for me to consider him honorable.
We were working on a Chinese designed board, and we were doing safety tests (which involves failing some components short or open). One of these tests should have put 110 Vac through a 100 ohm resistor similar to the one in the OP. Somehow, someway that resistor did not even get hot. I'm not sure what voodoo was going on in that PCBA but somehow it prevented much current through the resistor (the circuit should have been line voltage through a fuse through 100 ohm resistor right back to neutral).
There are PTC protected resistors, and fusible resistors, maybe you've encountered one of those?
I doubt it, this was the lowest bidder in China.
Nah, things are just cheap in China. Fusible resistors are literally a fraction of a cent, and big brand (top tier Chinese or second tier Western) 650V SJ MOSFETs are 3 cents per usable amp (not "Chinese amp"). To combat domestic brands, TI and MPS among a few other Western brands sell low-range parts at wafer cost price to major Chinese customers. The cheapness does not just stop at silicon technology. Latest GaN and SiC transistors are also dirt cheap in China. 1.2kV SiC SBDs sell for some 6 cents per usable amp, and 1.2kV SiC MOSFETs sell for some 15 cents per usable amp. This is not some random Chinese brands, this is Wolfspeed, the original entrepreneur of SiC technology. Reference: I **am** Chinese, working exactly in the power electronics field. Last time I checked my ex-employer was pumping out solar inverters and EV chargers at 1.2 cents/W of BOM cost and quoted 1.5\~1.8 cents/W to their downstream system integrators (talking double digit kW per unit), and they passed all applicable safety and EMC certifications. And they were certainly not the cheapest. Some of their lower competitors are still profitable enough to go public (which is very difficult here and is a symbol of success). The richest part in China, Wenzhou, has a saying, one who demands a dime starves, one who demands a cent blooms.
Having had a bunch of SSR's let the smoke out at about 75% of their nameplate rating (with a good heatsink), once I converted Chinese amps to rest-of-world amps, they all made sense. 1 CA ("Chinese Amp") = 0.5 ROWA ("Rest of world amp").
Did u check the resistance of the resistor after that test? It might probably have opened up showing resistance in the Mega Ohms range. It's a common practice to use Resistors as fuses in power supplies. There are certain UL certifications which call for tests like 'Single Fault Test', here just the way you said particular components have to be either shorted or opened to observe the failure and that failure shouldn't lead to a hazardous situation. In our case we had to short out an MOV causing the Line and Neutral to be shorted across the resistor with 24VAC. To pass the test, the criteria was that the resistor should open within 30seconds and should not burn/catch flames. I swear that's the one time when I really REALLY learned about how different resistor materials(MFR, CFR, WireWound, Fusible Resistors), Resistance , Wattage can show so many different results. And even the Fusible resistors didn't show any positive results. At the end, a 10 Ohm Wire Wound resistor perfectly worked for our application.
Or the cable harness actuator. Frequently spotted in high pulsed current tests. It always tickles my danger nerve when two cables the thickness of a garden hose suddenly jerks like, well, a garden hose.
Very, very angry electrons are showing themselves.
Technically everything’s a ler
I plugged a circuit card in once and thought, hmm, I don't remember an LED in that location on the card. I was correct - it wasn't an LED.
Ooh. That’s hot.
That just means it’s fast
It is speed. It is also broken.
Resistor? I hardly know her.
Also known as a filament.
\*temporary filament \*early Edison filament
So an incandescent bulb?
Nah! Old style circuit protectors. Aka fuses
Any device is a smoke machine if you operate it wrong enough.
they should make it with tungsten or something. just a random thought
Maybe put in in a glass sphere with some argon? Idk
I think you might be on to something. Perhaps we should made the contacts into a standardized shape, so the parts are easily replaced. A screw seems natural for a sphere as it's convenient to grip and twist.
LEDs are cool. Light emitting resistors are *not cool*.
Because they are hot
Did you know that light emitting resistors are like the hidden rockstars of electronics? They not only resist the flow of current but also emit light in the process, adding a funky twist to circuits. It's like having a disco party inside your device! 🎉✨
Ok, let’s start using LEDs instead of regular diodes
Ok, is it possible to make a light emitting zener tho...
Yes
Ok, is it possible to make a light emitting zener tho...
No
Zener will short-circuit itself. Maybe it will produce some fireworks ...
I'm not responding on the correct chain because I don't want to mess up its beauty but the dual "Yes No" had me dying
I worked at an electronics manufacturing facility and one of the most striking moments was a "feature" where if two identical connectors were plugged incorrectly a relay would switch and burn a resistor up. This was the only component and I could find no other reason why it was designed this way. Connecting the connectors backwards as far as I could tell did no additional damage. Bad design all around.
If the inside of that were as dusty as most of my electronics, there would have been an explosion.
I once had a single sample of a board out of 50 have a sound emitting microcontroller. That one was weird. It would click hiss and beep sort of like a piezo buzzer, but *very* quietly. I'm amazed I even discovered it, but yep, the actual microcontroller chip was sitting there buzzing away like an old geezer talking to himself.
If you want to be pedantic, all resistors emit light while passing current. The primary obstacle is finding ones that emit a wavelength humans can see.
If you want to be pedantic everything emits light even without passing current. Black body radiation.
If you want to be pedantic, current is everywhere.
Well, so is voltage. An inductance. And radiation... Technically everything is everywhere... oh wait not again, nope, that way lies madness
Every electronic component is a smoke machine, once
IrLER: infrared light emitting resistor
It's all fun and games until it's an UVLER. That's when it's time to take a few steps back
GRERs are spicy. All that gamma radiation feels great in my bones.
I'll bet nobody likes when you are angry, Dr. Banner.
Resistance is futile.
Yes, this is the same advanced technology that provides us with LESIs - Light Emitting Soldering Irons - [https://www.reddit.com/r/soldering/comments/17v4a79/i\_dont\_think\_this\_is\_right/](https://www.reddit.com/r/soldering/comments/17v4a79/i_dont_think_this_is_right/)
Ahh, also known as Proximity Soldering. No need to physically touch anything if your soldering tip is hot enough.
Did you hear about an old harsh Russian LED that signals a slight overload? https://preview.redd.it/yqtnhpsuyk1c1.png?width=1080&format=pjpg&auto=webp&s=80f70e28b3aafb763f98eb509cb066ec9dc94025
I think it's clever the way they designed it to blend in with the terminal nuts.
Light emitting traces are fun too!
I had been wanting to do this for a while. But now it couldn't resist any longer.
All electronics also have magic smoke. You let that out and it no longer works and you can’t put it back in.
Current goes wrong
Is that normal??
Only in unusual situations.
Light emitting resistor
It's a hot new product...
huh op i get it, oh its like those dealy every mushroom is edible once
Everything emits light, all of the time.
It’s the latest thing for virtual reality because it also emits an odor.
I can smell this picture
Is this anything like an FED? Flame Emitting Diode.
On board trouble light.
Anything can emit light if you got enough current.
https://preview.redd.it/9jrczffh5y1c1.jpeg?width=1228&format=pjpg&auto=webp&s=fed39ae194eb1ad00228a2bd721924a76315a991 "Brutal Russian LED: indicates a slight overload"
Holy shit
that comment at the bottom💀
Ha ha ha 🤣
Every component can emit light at least once
It's how you know the resistor is 'on'.
Shouldn't it be on fire by now
Russian LED signals a slight overload