How to make a laser microphone

How to use a laser, a mirror, and a light-sensor to make a microphone.
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[@professordeb]

A roomate of mine studying electrical engineering did a senior project on this very concept…but in 1981 there were no personal computers and digital tech was way less developed so I think it was custom-designed circuitry. It worked, but only “kind of”…he was obviously decades ahead of time!

[@paulbriggs3072]

You should have said "Watson! Come quickly, I need you!"

[@axilleas]

I don’t understand how this channel doesn’t have more subs, great quality content!

[@GaryMcKinnonUFO]

Intel services have been using these for decades to listen through windows at a distance, clever stuff.

[@victorminces]

I actually heard that when intel people are having a conversation they put a device on the window to make it vibrate, so they above being eavesdropped. The intel microphone inspired this,, but I didn't want to teach people how to eavesdrop :)

[@GaryMcKinnonUFO]

@@victorminces Blimey, vibration wars!

[@ehsanshahzad4971]

On my recommended and its VERY GOOD , I hope this goes viral and you earn a lot of money :)

[@victorminces]

Thanks so much!! I appreciate your support

[@7evenpm]

This is gonna blow up, and I hope it does. Great stuff.

[@victorminces]

How sweet! Thanks!

[@BloodyMobile]

This is one of those things that thought so far outside the box, it makes complete sense AFTER watching the video, but absolutely no sense BEFORE... wow.

[@victorminces]

How sweet! Thanks so much

[@kingmasterlord]

this is how the intelligence community listens to people's conversations. they shine a laser pointer on a window pane

[@victorminces]

I know! It is inspired in that. But I didn't want to make a tutorial for spying

[@Melissa-k3z]

The Cia was doing this a very long time ago,and I will still use it

[@tobiasgertz7800]

Gracias Vic

[@farhad6365]

1:59 the glitch sound before the recording seems like it was recorded in an electret condenser microphone... (idk but i guess that electret condenser microphone are a form of capacitor.. and that glitch sound produced by the high voltage spikes of the capacitor discharge..)

[@igxniisan6996]

But I love the number of subscribers you have right now

[@navneet7075]

Glad to be in your first 100 subscriber....🙏🙏🙏🙏

[@datguy5818]

This is so vlever that i am going to subscribe. 👏👏👏

[@mize_yir_bizz]

Try sending ultra-sonic or acoustic sound waves over the laser beam ..

[@azeddineabdoune814]

Good work thanks 👍!

[@backup4979]

Very cool

[@victorminces]

Thanks!

[@finminder2928]

The title implies that we would get a microphone that only picks up sound coming from a single direction. They have speakers which do this, which the sound waves can be directed toward a single person in a room without everyone else hearing it.

[@innovationsforall]

Nice!

[@joehuntsghosts]

Can you splice multiple photo sensors into 1 and use multiple lasers ast the same time reflecting back with mirrors?

[@victorminces]

I don't see why not

[@mize_yir_bizz]

Wire a 4 pin RGB, one pin for modution and the Red, Green & Blue pins set up to different input's. On the the receiving end also use RGB's for modulation and wire to the same colour as the transmitter. You may be able to send 3 different signal's at once ..

[@joehuntsghosts]

​@mize_yir_bizz thank you! Going to try that

[@king_james_official]

what other medium could we use to record audio? now that i'm thinking about it, everything is a wave, so we're just converting waves into waves haha

[@victorminces]

Anything that converts movement into electricity. There are some cool videos making microphones with pieces of quartz. And, of course, using magnetic induction with a coil and a magnet, which is how microphones usually work. It is not that hard to do it at home. We are working on a tutorial for that too.

[@lady_draguliana784]

LOT of spycraft based off of this...

[@TrendingTricksandFun]

i like it

[@mcwooley]

Can you hook up an NDIR that only picks up the CO2 that you exhale through your wind instrument? Tuesday, May 2, 2023 CE, 21:30 EDT

[@mcwooley]

Or put some kind of filter over these so that only CO2 breaks it (instead of other gases)? Tuesday, May 2, 2023 CE, 21:33 EDT

[@victorminces]

If I understand correctly. You can input any signal through the micophone jack. An issue is that the microphone input generally has a high pass filter, so if you are trying to record signals that change slowly in time, you might have trouble. I don't know how the NDIR signal looks like. Does that answer your question?

[@mcwooley]

@@victorminces First off, I can't thank you enough for responding, I've been posting this everywhere and you are the first one to respond I'm talking about just using the beam itself as a microphone, not with an external input But a special kind of beam and sensor that only breaks when you blow your wind instrument into it, not just any sound in the air (even if you that wouldn't actually involve an NDIR) I'm wondering if you can electrify your wind instrument the way that electromagnets electrify most guitars, and I'm sorry if that is off topic Wednesday, May 3, 2023 CE, 17:08 EDT

[@victorminces]

@@mcwooley Oh I see. I am not sure that the changes in density associated with the vibration of the air inside the instrument might be enough to change the laser. My guess is that they won't, but you can try and let me know. Regarding electryfying instruments in general. The way an electric guitar pickup works is that the string movement interact with a magnet at the pickup, changing the magnetic field as it vibrates, then a coil in the pickup converts those magnetic field changes into electricity, which is then amplified. You could do something like this with any vibrating object. The issue with wind instruments is that what is vibrating the most is the air column (so you can't attach a magnet to it).

[@PrivatMann]

But how to Build the whole thing, where to buy parts etc

[@victorminces]

The parts are shown on the second half of the video

[@jag0937eb]

It's all very good and stuff, but can you sing to a laser while eating a cheeseburger?

[@victorminces]

of course i can

[@vid2ification]

media.tenor.com/KPmcqGSuMhMAAAAM/hurricane-michael-fun.gif

[@jag0937eb]

@@victorminces prove it, make a video so we could all see it.

[@seloameEAlorvi]

If I may ask , what is the value of your photoresistor ? I acquired 10k photoresistors and have not yet been able to yield any results.

[@victorminces]

I ordered this on amazon: eBoot 30 Pieces Photoresistor Photo Light Sensitive Resistor Light Dependent Resistor 5 mm GM5539 5539

[@seloameEAlorvi]

Thank you.

[@larcomj]

interesting, what are the specs? freq response, SNR, sensitivity etc?

[@victorminces]

It is not so great as a microphone. The goal is more educational. Measuring those specs could be a good activity for an engineering class

[@ericweatherby9628]

I'd expect poor high-frequency response with a cadmium sulfide photocell. I could be wrong, though.

[@no_handle_required]

1950's spytech. Already been done. All the way to the white house.

[@PhillipAmthor]

Next video: How to make a death laser microphone!

[@stefandegu5150]

#electroBOOM can you verify that, that would be cool :)

[@vaibhavebhatnagar]

Hi Doc, do you have an email or a Twitter or LinkedIn handle, that I cN DM. We are trying to use similar stuff for healthcare.

[@victorminces]

hey! you can contact me through the "contact' field on my website. www.listeningtowaves.com

[@DanFrederiksen]

This is just light intensity, no interferometry

[@nicoblaytherealflamingo445]

I live next to cal tech in LA. I also found out the creator of the voice to skull test lives right next to two of my ex girlfriends. The first night of my v2k was her, i went insane and i could hear them gambling on simple this i was doing as i was about to do itand laughter repeating as if this was normal, but was horrified than fiction. This will do wonders and raise hell. Maybe bring wonders to hell for is the key to life

[@nicoblaytherealflamingo445]

Lets hope the nazis dont come across this tech