rpaddock
This reminded me of a Blog entry I wrote about in 2013 on
"Massive Electro-Pyrotechnic Initiator Chip Resistor
(MEPIC)". These are 0805 chip resisters that are by design
meant to let out the Magic Smoke that runs all electronic
parts.Sadly I could not get free samples from my Vishay
Rep, that I was in good standing with. MEPIC85N8R0KTT come
in lots of 10,000 to buy.Be sure to check out the
application note "A Guide to Using EPIC / MEPIC Igniters
in Pyrotechnic
Applications".https://www.vishay.com/en/product/53058/Nati
onal Semiconductor, bought by TI, used to make a similar
part, check out the application
note:https://www.ti.com/lit/an/snoa217/snoa217.pdfThis is
what I wrote about the MEPIC parts a long time ago:"MEPIC
resistors, also known as bridge resistors, are resistive
elements that convert electrical energy into heat energy
in a precise electro-thermal profile for the purpose of
initiating a series of pyrotechnic events in a controlled
energetic reaction. [They go BOOM on command, which is
different than Rapid Spontaneous Self-Disassembly.]The new
Vishay Sfernice resistor is optimized for electronic
igniter applications in automotive safety systems for the
deployment of airbags and other safety devices; digital
blasting in mining applications; and in fireworks
applications for better synchronization of fireworks,
music, and special effects.With firing energy down to 1.5
mJ and a typical ohmic range of 2 Ohms (+/- 10 %), the
device provides designers with very predictable,
reproducible, and reliable behavior.Offered in the
standard 0805 case size for the wraparound and flip chip
versions, with other sizes available upon request, the
resistor features easy set-up of firing levels, and is
compatible with various pyrotechnic compositions.Offering
ESD withstanding to 25 kV without extra protection, the
MEPIC resistor's performance meets no fire/all fire
conditions and the requirements of USCAR, AKLV16, and
major car manufacturer standards.The device is
RoHS-compliant and conforms to Vishay "Green" standards.
[Is it not great that Fuzes are 'Green'?]"
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> ahazred8ta
Byte Magazine had an April ad for a Noise Emitting
Diode. The symbol was a diode wearing a pair of
earmuffs.
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> Gys
You forgot to add a link to the blog :)
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> > rpaddock
It was not an oversight, however since you
asked:http://blog.softwaresafety.net/2013/04/magic
-smoke-resistors...
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> ForOldHack
MEPIC fuses... ok... Green? Oh my!
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exmadscientist
The actual "make it go bang" bit here isn't the most
potent. (I think I have capacitors here which wouldn't
care in the least about this, despite their datasheet
ratings.)If you need to take it to the next level,
consider something based on a xenon photoflash driver.
These aren't as common as they used to be, but they're
still not hard to make. I had to make one of these a while
back and ended up using one of those $5 LTC chips but that
was appropriate for the situation; there are certainly
other ways to do it. This will basically charge a 400V
capacitor up for you, which you can then dump into the 5V
part. High-quality 5V capacitors will handle small spikes
of this. But using a big 400V capacitor will make a big
spike, which is not kind to the other capacitor. (I must
confess I didn't try blowing up a lot of things on the one
I made, but it was medical test gear, not technically a
capacitor-blower-uper, and I was on deadline anyway. I
also had other, significantly more destructive, equipment
available to me should that be the goal.)
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kps
I expected an alarm clock using a capacitor for timing.
Either charge it to a delay-dependent level, or charge it
to a fixed level and discharge through a delay-dependent
path, or trigger when it drops below a delay-dependent
level.
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felooboolooomba
Sorry I'm late, the capacitor didn't blow.Did anyone else
smell capacitors when they watched the video? The brain
does funny things.
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andai
There's a video demonstration about halfway down the
GitHubhttps://github.com/ArcaEge/capacitor-alarm-clock#Dem
o
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uberex
Based. Unhinged. Don't try this at home.But it is also
art. It represents the waste in our devices that play out
over 1-4 years (or say a few weeks for a vape) but in one
night.But yeah. Don't do it. Indoors? wtf!!!!
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> nmeofthestate
Oh no. I quite liked this until you said it was art
that Represented something.
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> > user_7832
To be brutally honest it sounds like LLM speak to
me. The account being in green doesn't help.The
line between an LLM being told to sound like an HN
user, and an actual user who's adopted LLM lingo
is... vanishingly thin at times. I myself
accidentally find myself using such phrases, I can
hardly accuse others.
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> > > uberex
I am human, to prove it I have laid down an
em-dash below:-
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alnwlsn
There are some grades of electrolytic capacitors for which
this is probably the only thing they should be used for.
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beeforpork
That sounds completely safe and healthy! Hmmmm, I love the
smell of vaporized electrolyte, particularly when waking
up!
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> fc417fc802
I feel like a wire detonator would be safer plus the
consumables would be cheaper however even then I doubt
vaporized copper or aluminum is good for you. Honestly
just roll some firecrackers and use the ESP to light
them off.
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> > hilariously
For some reference work
https://www.youtube.com/watch?v=agwKNLoU6g8
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> gosub100
But it's got electrolytes!
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huydotnet
For anyone jumping into this thread hoping to see
capacitor use for timing, there is this blog post about
something like
that:https://notes-huy-rocks.translate.goog/posts/diy-pomo
doro-ti...(google translate link because the original post
was in Vietnamese)
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sscaryterry
Try this with a tantalum capacitor. Careful not to lose an
eye...
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> Uncle_Brumpus
Luckily our eyes tend to be closed when we're asleep.
Evolutionary safety squints.
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> > mc3301
I'd like to see a study on the threshold of
projectiles versus safety squints. I searched
around, but couldn't find a paper.
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> RetroTechie
LEDs also work if you've got enough energy to dump
into them. Think bulky high-voltage cap + beefy
MOSFETs.
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nine_k
Heh. I hoped to see a fully analog capacitor-based
"movement", either a mechanical movement powered by
periodic electric pulses, or maybe a device using
split-flap displays powered by three highly precise,
thermally-compensated capacitor discharge circuits.
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peterabbitcook
So it's not UL listed?Do you need the 15V input to torch
the capacitors and run the relays?
Could I use a 5V USB ESP32 dev board instead, and just put
a boost circuit or MOSFET on the relay load side for the
explosion circuit when it needs to go off, or are there
other components that need the higher voltage?
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> arcaege
You could, but from my measurements the capacitor
tends to pull ~1A before it bursts, so you'd be
running up against the 3A limit of USB. At voltages
below 12V, they don't seem to go off reliably.
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> > rpaddock
Have you tried a backwards polarity tantalum
capacitor?
I've seen those go off just on their normal
voltage when installed backwards. Sometimes
immediately and other times with significant
delay.Eye Projectile and Eye Flash protection
along with hearing protection are required.
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bilsbie
What's happening at the electron level that makes them do
this? Anyone know?
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> sdlion
If I recall correctly, electrolytic capacitors have to
get "burned in" during manufacturing to make them
work.A current is passed through the capacitor and a
thin film of oxide is built up in one of the
terminals, according to the polarity. This is why
electrolytic caps have polarity, if you use them with
their polarity inverted, you flake off that oxide
layer and thus short them out.A free running current
in that electrolyte boils it off, and you get an
exploding cap
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gosub100
Tangent: I remember when hackaday posts about building
cool and or useless circuits were posted constantly to HN.
Now I can't remember the last time I saw one. (I know this
link isn't hackaday, but it's exactly like what they
feature).
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cmos
The perfect alarm clock would start lighting your life
dreams on fire if you didn't wake up, cause that's whats
happening anyway.
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inigyou
Electroboom did this first, right?
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> piinbinary
The README references Electroboom's implementation
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ahoka
Is this not technically an IED?
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> NDlurker
Doesn't look improvised to me.
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> stackghost
This is absolutely how IEDs are made. You buy an old
Nokia phone and wire the speaker/ringer to the
detonator. Call phone -> boom.In fact, TFReadme
directly references Electroboom/Mehdi Sadaghdar who
did this with an old-school analog alarm clock (the
kind with an actual bell) and in the video he muses
that it's literally a time bomb, har har get it.
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> > fc417fc802
> wire the speaker/ringer to the detonator. Call
phone -> boom.Given the constant stream of spam
and scam calls I get that seems like an incredibly
bad idea.
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notahacker
Wondering if we can adapt this for our pulsed power system
:)
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adnaahmed
the alarm clock for the ai age, it needs an LLM
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> KaiserPro
It is an LLMa Life limiting machine
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PunchyHamster
"Sorry I overslept, the capacitor didn't go off" gonna be
funny excuse
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user_7832
Nice job OP, and thanks for the demo video! PS to others,
keep your volume below 40%....I may or may not have
jumpscared myself by cranking the volume up before the
alarm time as it was so quiet.
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block_dagger
How about a flux capacitor clock?
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netrap
that's a bomb dude.. lmao.. don't take that anywhere!
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> 542354234235
Just about anything can be turned into a bomb. Take a
coffee cup, a smart watch, and 5 lbs of C4, and it
could easily be turned into a bomb, for example.
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