Tuned Antennas Lighting Up LEDs
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- Опубліковано 25 сер 2024
- In this video, I demonstrate how resonant antennas which are cut to specific lengths, are able to light up LEDs, if you transmit on their resonant frequencies. For those who want an expanded description on how to build one of these antennas, please watch this video.
• 2 Dollar Radiation Det...
When I was maybe 12 back in the stone age, I pounded an old tent pole into the ground, connected to to one of those old earplug things in parallel with a diode, then to a long piece of wire. I listened to the local high-power AM radio station. It seemed like absolute magic. But, my Forrest Mimms books from Radio Shack were my inspirations.
Great story. You never forget those magic things you did as a kid.
I love forest mims books, As a kid I started with crystal radios.
I picked up those books from Radio Shack also.
we no longer have radio shack but imma try to look for this book online
Those were the ones with the hand drawn circuits and pictures? Like sketches
Now THIS stuff is worth watching!!
He should've made one for the "5g" network that pumps out 26-28 GHz like a microwave. (mainly used in Europe so far)
but how much amsp? 0,10-0,16amp. watt per squaremeter 3,57-10. not even worth to talk aboout it 😄 please don’t be silly and waste your time with the other aluminum hat wearing idiots.
Ok 🆗 idk job on job job kk jijojoi for job just it to join join just kidding me you in ijiooj@@Greatdudeguy
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@@Greatdudeguy Microwave actually pumps 2,4GHz, just like WiFi or Bluetooth...
Great stuff. In the early 1950s went to sleep listening with earphones to AM network music on a crystal set. On my favorite station, Hawaiian music was playing at my bedtime. Funny how familiar I was with every tiny spot on the crystal, and where to put the cat's whisker for best reception.
Now that’s like magic
You read my mind about something..
I didn't think the camera's framerate would grab that. Just Beautiful! 😄
It's not the frame rate. It would need to be in the excess of 10kFPS to be able to capture it.
What is capturing it is the line by line scanning speed of the chip akin to the rolling shutter effect
@@simonkondrk7569 You're right. I was thinking more of exposure time .
@@simonkondrk7569 its mostlikely rf signal/25fps video frame rate.. higher then 25 fp/s on signals will be missed or resonance points of that at 1/25 fps :P welll this is still relative to frame capture timing precission and starting point/drift point of signal.. so no clear definiting as frame rate and signal freq data freq are not in sync... still fps and freq may be in sync or close to sync. as similar resonators/crystals are used for booth.
Now, convert the light to audio !
@@MrBrandonLindner You couldn’t would be awesome though, I think the audio hz should have to perfectly aline with the shutter speed of his camera
That might be the most aesthetically pleasing circuit diagram ive ever seen
Well, I guess this is my Sunday now. I'm sure this will blow my friends minds. I wish they still taught analog things like this in the EE curriculum.
It's never to late to learn.
idk what kind of curriculu you're looking at but we still get taught this
@@zahnatom US, ABET certified program, top 20 school, 1 optional class senior year.
They don't?
It's a light bulb big whoop.
This is brilliant! For such short videos you craft an immense amount of valuable information.
You’re an Amateur Extra-Ordinary!
Thank you. It took many attempts, before I managed to squeeze it in the 60 second limit. :-)
Wow thank you so much for that comment
@@GrantsPassTVRepairyou’re making a huge impact on sparking young minds to get curious about electrical engineering as well as reminding us older folk of the fascinating basic principles that got us into it! Thank you
@@ErikPelyukhno I couldn't ask for a nicer comment, so thank you.. As a kid I had an uncle who built me a crystal radio, and then gave me a 10 in one electronics kit and never realized where it would lead, so I enjoy being able to pass this on some of my enthusiasm for experimenting, and learning in this manner., All the best.
@@ErikPelyukhno Thank you for the encouragement,
I grew up in the early 90s late 80s, you remind me of my dad, he was skilled with everything from electricity to motors, by day he was a carpenter to support hisfamily but by night he was everything else, we mostly worked on my dirtbike motor and we would mess with the cb scanner and radio, it was so fun.
Is that good for a crystal radio?
Congratulations on having an intelligent, clever father. That is the kind of person this world needs so badly. Celebrate his memory as much as you can!
He'll yeah
Salute to you and your family bro! 73
For the last 100 yrs farmers did much the same having to build/fix everything on the farm. Many farm kids learned to drive car and trackter at a very young age as well as weld oxy/electric and of coure crystal radios were standard fare as well.
Reminds me of those radio-powered LED stickers that were on every girl’s phone for about a week in 2004.
neat idea
That was very popular in India at that time.
Never even seen that before
Oh yeah, I bought one of those 20 years ago. But IIRC those needed a watch battery to operate, at least the one that I had. I think there were low range ones that you sticked directly on your phone, those ran without battery directly from RF, but there were longer range ones which detected phone calls from about a metre, and those needed a battery. But I might be wrong. Mine also detected our microwave from about 20" if it was running.
Just checked, they are still available built into phone cases and as keychains. Seems like these new ones don't need a battery, at least the phone case version, the keychain might need one.
interesting builds! i'm a ham and this would make a cool practical showcase to get more younger people interested in the hobby
I'm also a ham, and I had the opportunity to demonstrate this to our local ham radio club. 73s ;-)
@@GrantsPassTVRepair 73s to you too, de SA4UNA
I always wanted to rig something like this when I was in the Navy, to let me know if aircraft on the carrier's flight deck had left the radar on. I never did the ground-work though. The idea was to wire it to my glasses so I could see it automatically.
I've heard of serious injury due to doplar radar and military ship radar if turn on while guys were working on or standing inline and too close. Doesn't sound like very good tag/lockout procedure.
Same with military high power sonar effects on divers, it supposedly turns tissues to jelly.
There's an odd account of a Chinese ship adjacent to U.S. vessel that lost all coms, navigation and power and had to be towed in for repair. Kinda makes you wonder what we got! Lol
I wish I had more friends like you 😢 the general population just doesn't understand the physics and therefore cannot fully enjoy the Bliss of science.
I know what you mean. It seems like the younger generations are more interested in video games, but I do get a few experimenters now and then.
See if you have an amatuer radio club nearby where you can meet like-minded people.
Wow, you actually took time to reply to my comment! 🫢 I'm stoked! I'll give that a try and I'll keep you posted, thanks again by the way :)
Lovely simple idea , my friend used to use small light torch bulb connected at centre of dipole near Transmitter to tune up amplifier, only works in close proximity though maybe not as sensitive as LED version shown
Always love watching stuff like this, so many interesting things to learn/know
proposed shorts like these, convince me that I use youtube properly and the algorithm proposes such wonders! good job!
This was incredibly awesome. Could make an entirely passive Wi-Fi/wireless bug detector with these I suspect!
I don't think you could make a passive bug detector this way, but if you attach an audio amplifier to the ends of these diodes you can sure hear some interesting transmissions, such as the ones that come from a wifi modem.
Unfortunately, I would imagine probably not considering you have to be extraordinarily close to the source signal to get it to respond to anything
@@GrantsPassTVRepair can we make a low cost iot device like this?
for example a simple toggle switch than can turn on and off with pulse of a specific freq. ? And a centrel base station to transmit that freq, attached to a computer running home assistant?
@@vaisakhkm783: It's possible, but the system as you've rescribed it would be extremely vulnerable to false triggers. What you _really_ want is a longer transmission that encodes some sort of key, AND a code to indicate the action. The "just detect the frequency" method is appropriate for telling more advanced parts of the receiver to turn on (so that it can try to detect that fancier signal), but it's just not enough for a good control scheme.
I'd say a good entry-level system is to use a single frequency, changing power levels to encode high vs low.
First, you have a basic filter followed by a diode that feeds a resistor and capacitor: when the voltage across the capacitor gets high enough, turn on the rest of the circuit; if the circuit turns off too fast then increase the value of the resistor, if it turns on too fast then increase thebvalue of the capacitor (or add a second resistor to reduce the current through the diode).
Second, you feed the same signal that initially enters the first section feed an AGC: the output of the AGC will stabilize close to some voltage, but drops and rises in the signal level will still have an effect on the AGC's output. Run the output of the AGC through a copy of the first section of the circuit (the one that turns on everything else), and run that through a amplifier to force the signals to on & off: this is your raw bit stream.
Third, have a simple clock, possibly a 555: feed the clock into a shift register's clock input, and feed the raw bit stream to it's serial input; it's desirable to have a PLL system to synchronize the clock with the data, but if you have a good enough clock and short enough transmissions then it should be fine to just run the clock at twice the speed (or more) of the bits, and just ignore every-other parallel output: I'll assume you've done one or the other.
Fourth, run the outputs (that you aren't ignoring) through a Hamming (7,4) decoder: this is pretty simple, and can be implemented with simple circuits, though you'll probably want to make sure that the parity bits are the _negative_ of their "proper" value for the sake of keeping the AGC at the right level. You'll probably want at least three, which will place some requirements on your clock; the outputs of the decoders are your ECC output.
Fifth, compare the final bit of the ECC output with a parity check of all the _other_ ECC bits: whether they should match or not is up to you; this is your parity check.
IF the parity check passes, AND the "target" section of the message matches a hardwired ID that you chose, AND the action section of the message is something recognizable, then your device should do whatever "the task" is. Also beware that this is a very simple system & description, and much better can doubtlessly be made.
@@vaisakhkm783Uh, no.
You can use it to pinpoint how devices transmit/receive WIFI signals though!
Like, this Samsung phone I have has the WIFI antennas at the top of the device, in the earpiece area.
Slightly useful for making the internet slightly faster.
I love your stuff seriously whatever happened to the day was when UA-cam was just people talking about stuf instead of a whack job corporate sellouts
Just made one for the 70cm band using 2 leds, now I have an interesting toy. It only works at close proximity though. Thanks for the idea.
Did you use the two LED configuration, or the detector diode and LED combination, which is far more sensitive?
@@GrantsPassTVRepair I used the two LED configuration as I did not have the detector diod or it's similar on hand. I knew it wouldn't be much sensitive and I just made it cause it looks cool and I can use it to teach others about radios and antennas with the help of a handheld radio.
One question that I have is that if the mentioned detector diode was used, would it be possible to damage the devices when transmitting with about 5W at close proximity?
I learned more from this video than I did in a whole day at school.
So glad I accidentally found this channel. Such cool
Content
I love your radio videos. Keep them coming brother.
Thank you.
Folks, in the late 90s cell phones antennas that you could unscrew and replace with one that had a led. The led lights were flash and flicker when receiving a call or when on a call. They were energized somehow just off the antenna. No internal battery and they were universal on most cell phones
Phones only transmit (except for occasional momentary housekeeping functions) during calls or when exchanging data. When a call comes in the phone starts transmitting to establish the two way connection. Thus, the LED is responding to the transmit power, not the reception.
Yep, also if unscrew antenna and make a call, it would burn my hand
Give the man a medal
You just made stuff so much easier.. you could make one hell of a teacher yk
The match between wavelength and antenna length is something rly hard to understand for me
Thanks
Man, don't stop this content!
Going way back in time before a world filled with LED's.... I remember doing something like this with the crystal radio I built as a kid but only with AM radio frequencies from local radio stations.
Great demos, I think they show so much and excite people to learn more. I love these videos.
This is my new favorite channel
Thanks!
And if you pipe that into a mini solar pannel of various sorts for light detection with a speaker you will get audio. Different sensors and battery and mosfet assembly you can get a lot of audio. More work than other radios mind you, but fun idea.
Remember the little light cellphone charms? I never saw those again.
Your knowledge is old gold buddy keep teaching
This channel is so awesome, i am glad i found it sooner. This is exactly the type of content an aspiring electrical engineering student deserves
Thank you. ;-)
One the beautiful channel i ever found on UA-cam
This has got to be one of the coolest things I've ever seen on any platform like this. I use radiodetection for utility work, and just seeing other ways to detect it is fascinating! If you know anything about divining rods I'm all ears 👂🌽
Suppose in some dense areas all of them will be light up at the same time 😅
It's great to see, there are still people with solid knowledge, sir beside of that you got great explanation skills 🍻
Thank you.
Fun! I use my phone camera to check batteries in my tv remote. So cool to visualize the pulsing light.
You should watch this guy's short where he basically hooked an amplifier to a solar panel to pick up the exact IR pulses your talking about
You are on the verge of making a huge discovery I feel like.
That would sure be fun. I'm not the person who discovered the LED diode configuration known as a lectenna, but I just expanded on it.
he's just showing us the science. it would be a lot of research in bleeding edge physics to discover something new
@@myballspaul4889that's a misconception. you can discover something new. But it's just more likely that the discovery would be something small or very niche
I would like a full video on how it's made, especially the fine tuning
I placed a link that has more information in the info section of this video, but here's the link for your convenience. ua-cam.com/video/vHVmJ5lD9jc/v-deo.html
@@GrantsPassTVRepair Thanks!🙏
@@GrantsPassTVRepair There are several other Mfgs of this number diode. Will they work also?
Plethora of knowledge good sir! Great way to see the electric or energy in the air, that is too Kool!!
Thank you for sharing years of knowledge
I wonder if the taliban used something similar to this to detect when we were using night vision in the caves of Afghanistan. I've heard early in the war we "owned the night" and could see like we had superpowers, but after not too long the "primitive" men in those caves found a way to detect the IR light we used. They didn't have the tech or manufacturing to make night vision but they now had the ability to know when we were looking. So they'd rig the cave with explosive and detonate when they detected IR light. I'm sure by the time we left they had their own NVGs but the low tech analog stuff like that really fascinates me.
I wear a tin foil hat so that these don’t effect me while eating breakfast.
And you can see it with the rolling shutter! That’s awesome
I'm guessing you mean the scan rate of the camera, which the flickering LED reveals.
@@GrantsPassTVRepair It probably reveals the silence between sound, as only that's really low frequency enough for a 30fps cam to capture.
@@fatitankeris6327 Yes that sound about right. I figured it was just revealing the scanning going on in my camera,
Just like the old antenna toppers
Your drawings are needlessly amazing lol. I love them.
Love your videos! You have a beautiful mind!
now THIS is the stuff I cometo youtube to learn about. This is such a fantastic video
Cool. One day you will have a comprehensive diagram we can use and follow to make other things .
Thanks.
It was a challenge to pack so much info in a 60 second short, but you may find this link to my other video helpful. ua-cam.com/video/vHVmJ5lD9jc/v-deo.html
Very educational thank you 👍😁
You need a long how to video.
This is the first really good short I’ve seen in two years!
This may be what you're looking for. ua-cam.com/video/vHVmJ5lD9jc/v-deo.html
looks great as simple frequency detector...
Great presentation, very concise and descriptive.
Seems like an awesome science project for teaching.
In the last example you could put a small light detector infront of it and connect that up to a speaker and baddabing, baddaboom you have a radio.
Free lighting if you are close enough, or recharge your phone. 💙 T.E.N.
This is utterly fascinating.
Wow. Looks like my next tinker project
Induction is freaking awesome!
Omg this is amazing!!! I want to create a box that has tumed LED toy brain waves and i wanna practice activating them!! Thank you so much for this cool information!!!
This man is so in tune with the natural frequencies and energy in the world around him.
Nothing is natural about any of this lol. It's all radio waves.
True, but powerful radio waves do occur in nature.
Everything is natural. We are all part of nature. After all, everything is made out of the same stuff, no? 😅
A led is also a solar cell so will generate a small voltage. Can capture the audio if amplified.
This guy knows some crazy stuff
Place a high impedance headphones across in LF setup and hear the station! Crystal radio!
I’m def showing this to my kids in the future dope
I've always wanted to make a series of videos for def people, since many of my experiments don't need words to understand the science behind them.
❤😮@@GrantsPassTVRepair
This is the coolest thing I’ve seen in a long time!!! Thank you!!
Hitachi making electronics : 😇
Hitachi making *electronics* : 😈
i love the drawn diagram
Thank you!
Very enlightening video! Thank you!
You sir just got a new sub!
Thank you.
That is insanely cool!
The radio station, depending on whether AM or FM, is modulating the LED by the voice/music encoded to the carrier frequency.
Nice TS-430s cameo 😉
this is incredible, thank you 🙏
So what your trying to tell me is. I am in fact getting radiated. Thanks man.
Yes, but the radio frequency radiation is believed to be harmless at a distance, and I believe this is probably true, or I'd be dead by now. The exceptions are x rays, sunshine, rays from the cosmos, and lighting.
a good antenna and ground wire will light up the antenna and then be used as garden lights cool right. it would be pretty cool to try out..
Looks like your own body capacitance/charge is acting as a amplified antenna to couple/complete the circuit!
This guy is on another level
I'm no genius, but I do have an overactive curiosity, and a love of experimenting with unknown possibilities.
This guy is watching songs and listening lights
Never thought about doing that
Ha! I knew you were a HAM operator just based on how you were describing your antennas - nice!
Wow... that's super interesting
So free light for people who don’t have electricity.
Screenshoted thst one... Now i need to order some parts
Make one for 160 Meters LOL. Just playing around. Absolutely awesome video!
It would be huge. How about this one? ua-cam.com/video/yqljaKjKjd4/v-deo.html
@@GrantsPassTVRepair I enjoy your content immensely. I actually made one. Almost fit in the lot diagonally lol has bout ten feet hanging down in neighbors lot. It was definitely NVIS because it was on average only 20 ft. Above ground. Very narrow bandwidth. I made one Contact with a guy probably 100 miles away w 100 watts. Really cool! The lower frequencies intrigue me quite a bit with their propagation tendencies. 73s
@@brandonlaragirl The lower frequencies fascinate me as well. Especially when we have a thunder storm, and I can hear lightning many miles away. Sometimes I tune my AM car radio to an empty frequency, just to hear all the strange signals I find when I'm driving around. 73s..
Excellent!
I never knew it was so easy to pick up radio waves and transform it into a visable sprctrum with just an led. Amazing!
Thanks to the discovery of LEDs that use very little power, someone figured this out.
just a camera shot of the wave in the LED would be modern art
Nice! I made my DVB-T antenna using two beer cans ;)
Pretty cool stuff
That last one was cool.
Hearing the radio in your head after getting braces. 😂❤
Darpa harvests the energy that we emit. 802.15.4 into their 802.15.5 wireless sensor network. 😮😮
Seeing this video makes me want to put my house in a Faraday cage 😂
Very well presented.
You are just awesome you got yourself a subscriber
Thanks!
it took this long for me to discover how powerful radio waves are. if someone had asked me if you could power led's I wouldn't have thought so.
Good to know!
I guess this is how the new wireless doorbells work, the base sends a frequency and detects when a special built circuit without any power disturbs the wave? Which is the button at the door.
very cool ending
Thank you