You can get the plastic here secure.working... the audio was supplied by bensound - at www.bensound.com and it is royalty free
Пікірлер: 72
@RWBHere4 жыл бұрын
You could buy big electrostatic speakers over 40 years ago. They were half the size of a door, and sounded really good. For some reason, maybe too high a price, they never really caught on. They should have a very good frequency response, if made properly. Another option was the crystal earpiece, using a piece of Rochelle salt between two electrodes. Very beloved as crystal radio receiver earpieces. You've set the mind ticking, Robert. Thank-you!
@martinjandijkstra32055 жыл бұрын
I make ESLs for a hobby. You can make good sounding esls and construction is simple. Actually graphene would not be the best coating as charge has to be static. But you may use graphene to make stators conductive. Have fun with esls.
@martinjandijkstra32055 жыл бұрын
@@AdityaMehendale ; you will have 2 stators with the film in between. It is a pushpull system with very low distortion. High voltage is put on the film. It is generated bt a cascade circuit. I know a guy who used the high voltage output of an electric mosquito killer.
@martinjandijkstra32055 жыл бұрын
@@AdityaMehendale Well I think Robert has made an ESL just for the fun of showing that it can make sound. I cant see how this kind of construction can keep up with the conventional, free moving pushpull esl.
@kevinbeckenham38723 жыл бұрын
Thank you I really enjoyed you documentary on electrostatic loudspeaker
@DeliciousDeBlair5 жыл бұрын
I have been dreaming of making something like this for years.
@ThinkingandTinkering5 жыл бұрын
I think they are awesome
@socksumi3 жыл бұрын
Are you sure the graphene diaphragm is thin enough? Thicker material results in truncated high frequencies. I've heard this problem with an overly thick mylar diaphragm installed on a bad sample of an "Audiostatic" speaker. Extreme roll off of highs was the result while other samples of the same speaker with the right mylar sounded just fine. Unless the membrane is sufficiently thin you'll never hear the detail and transparency an electrostatic is capable of. And that graphene looks way too thick for such an application. Martin Logan diaphragms are typically about .0005 inch or 10 microns thick.
@robinvince6165 жыл бұрын
I think you need some sort of a fixed high voltage DC bias with the audio signal superimposed on it, otherwise the sound will suffer a frequency doubling (severe distortion). As the speaker is voltage driven, and the current is negligible, I would also doubt there would be any advantage in using your highly conductive coating on the plastic - a poor one would be equally effective.
@jeffreyrood87555 жыл бұрын
This is something I never really thought about. Thank you again for an awesome video.
@apollorobb5 жыл бұрын
The impedance mismatch between the amplifier and the transformer is causing the distortion in the speaker .That poor transformers primary is getting saturated
@nophead5 жыл бұрын
Form you description the "flyback transformer" seems to take a DC input and produce an alternating output hence the terrible distortion. It will only turn on on half of the audio cycle and only above some threshold. When I was a kid I had a valve record player and that had a normal loud speaker plus an electrostatic tweeter. I think the tweeter was just connected to primary of the output transformer, so only perhaps 100V swing, not 40kV.
@bobbg90413 жыл бұрын
Now if you held the small frame over a vented box your sound would be louder Thats why placement away from walls is critical with stats. However with the woofer id do a a periodic membrane over the front of the driver to load it down that way id get reflective bass sound off the low-end driver.
@johnmcfadden93365 жыл бұрын
I was thinking for your lab more than myself but I do want to start marking it so getting properly set up would be smart , I ordered ferric chloride stuff but got it in liquid form and after reading comments again I realized I should have got it in powder form, could I dry it to make it the same as powdered like you used although the permanganate way seems a good option I had another thought a few weeks back about fine tuning an ultrasonic bath to emit the resonance frequency of graphite and seeing your speaker video tonight , I wondered if you have thought of it or even tried it yourself , seems plausible but I can’t imagine no one hasn’t thought of it before so maybe it doesn’t help split the graphite but if it helped it could be handy Is tony still working with you on concrete development Great job as always thanks a million for everything you share Edit, This was meant to be a reply about the fume cupboard comment I made on your earlier video
@Ab202222 жыл бұрын
A very interesting video, any update?
@NoahKainWhittington5 жыл бұрын
Do you think that this device could be used as some sort of electrostatic microphone if connected to the correct components?
@greghardy26762 жыл бұрын
Video was brilliant...loved it
@proffessasvids2 жыл бұрын
Wonderful stuff! Xx
@tamaseduard51455 жыл бұрын
Good job sir 👍 🙏
@ThinkingandTinkering5 жыл бұрын
awesome lol
@assabjorn Жыл бұрын
thank you for a great channel and for you confirm and inspirate me for further experiments sir ,keep on teach me everything🙂
@NSPlayer5 жыл бұрын
Looks like a fun project
@ThinkingandTinkering5 жыл бұрын
I found it fun mate - lot's to do to improve it but basically it's all there and electrostatic flat panel speakers have a place for sure
@rommelfcc Жыл бұрын
Sprinkled some sand or salt or seeds on it, so you can see it bouncing around bitter. 😊❤
@prototype90005 жыл бұрын
Tin oxide makes a good coating for electrostatic stator
@ThinkingandTinkering5 жыл бұрын
awesome mate - nice share
@mikw18093 жыл бұрын
Indium tin oxide
@amazac20785 жыл бұрын
Hi ROB another great video, how about adding 4-5 mega ohms resistor in parallel and cut the sheets in a circular shape and at the far opposite side to adding an high voltage arrester then volume should be attenuated till you get the best performans not at the highest set.,keep the good work bro cheers mate .
@MrBellVegas2 жыл бұрын
So you don't sell the graphene sheets anymore?
@lizichell23 жыл бұрын
Very interesting and informative video
@assabjorn Жыл бұрын
could we use some of this to make speaker of lcd screen?
@ubacow71093 жыл бұрын
Product Page not found ?
@TlBubba3 жыл бұрын
How well does graphene respond to having holes punched in it?
@jamescunliffe98725 жыл бұрын
If you cut out the centre of a sweet tin lid and force fit the sheets between would it amplify better? There's a covering for model aircraft called solar film,iron on adhesive,shrinks with heat,could it be grapheneated?
@ThinkingandTinkering5 жыл бұрын
awesome ideas mate and absolutely - i'll look out for that material
@Karabetter5 жыл бұрын
"Mr. Watson - Come here - I want to see you." ;)
@ThinkingandTinkering5 жыл бұрын
lol
@prototype90004 жыл бұрын
If he comes to you i have a feeling you would be wearing his skin a few days later and a wig
@drspastic4 жыл бұрын
why not use a 50p space blanket?
@NSPlayer5 жыл бұрын
So curious if we could make it higher quality sound
@ThinkingandTinkering5 жыл бұрын
I am sure you could - have a look at commercial versions and see where they differ - build quality is on issue but to get this working I roped together some pretty basic electronics - a dedicated driver board would certainly improve it
@kcajmortsnnew14885 жыл бұрын
@@ThinkingandTinkering this was used as a cheap tweeter in the early days of audio...in order to get push-pull sound , screens w/bias voltage are needed electrostatic speakers have been considered among the most accurate , but they're complicated for the home builder..... plans were available through the 50's ( AUDIO magazine) , and SPEAKER BUILDER in the 70's this reply to Archie also , because sound is degraded by enclosing an ESL , they are nearly always used as dipoles , so must be LARGE .....i dreamed for yrs. of bldg. a folding screen ESL , but never got around to it
@michaelknight23425 жыл бұрын
@@ThinkingandTinkering tension your diaphragm to a frame. force used is proportional to voltage required. the buzzing sound comes from the plastic hitting stuff. if you insist on improving the driver circuit, look up schematics of old stax amplifiers. more info (200+ page thread on head-fi): google "diy electrostatic headphones"
@ThinkingandTinkering5 жыл бұрын
@@kcajmortsnnew1488 you should have done - it is always a lot of fun to actually DO something rather than just talk about it - you learn so much from doing is my feeling. You are quite right to create high fidelity reproduction is a challenge but to explore the science behind it and have fun is pretty easy - positive mental attitude mate lol
@ThinkingandTinkering5 жыл бұрын
@@michaelknight2342 insist? mate this is just fun to do -I don't really want to be a pedant as you are kind of right but I always thought that the force used was proportional to the mass of the membrane you are trying to vibrate and the square of the distance the membranes are apart. The strength of the field required to do that work was, i always thought, proportional to the voltage applied
@technosaurus38055 жыл бұрын
Who needs a separate phone screen and speaker when the screen can be the speaker. I wonder if one could do a stereo version by separating graphene coat into 2 sections.
@lowerthetone5 жыл бұрын
I may be wrong BUT this is very high voltage. You shouldn't touch it. A battery isn't enough to supply that voltage for very long I wouldn't imagine. However, Martin Logan (or one of the electro speaker makers) decided to turn a car windscreen into a stereo panel just like you described! I've never come across one in real life. Check it out though
@ThinkingandTinkering5 жыл бұрын
interesting idea mate
@ThinkingandTinkering5 жыл бұрын
@@lowerthetone it is high voltage but extemely low amps so the wattage is fine - a flyback is just what i had you could use a cockcroft wheaton bridge which is what they use in air ionisers and the battery version of that lasts for days - really this is just a starting point for folks to think about and to think how could they do it better - i hope they do and post some good vids on it
@bobvincent59215 жыл бұрын
Hi very interesting and immediately reminded me of the Leak speakers. The inearity of the LV to HV converter will be rather bad. About the build method could you suspend the two plates capacitor(this time with a foam separator. between)and then between the two outer plates of fixed high voltage and feed the audio to the inner capacitor so the whole lot will vibrate depending on respective rigidity.???
@ThinkingandTinkering5 жыл бұрын
nice one mate - personally i think time spent creating a driver board would be time well spent - rather than cobbeling it together from bits in the lab - but as demo of what can be done from bits around - ilike it
@cohelixcohelix12125 жыл бұрын
So how is the coated plastic made?
@ThinkingandTinkering5 жыл бұрын
I make it
@ebb24215 жыл бұрын
I think those are 3-6 volts DC input...
@lowerthetone5 жыл бұрын
That's great! Because an amplifier doesn't put out too much more than that unless youre going loud loud!
@ThinkingandTinkering5 жыл бұрын
yes they are - clearly - better control electronics is a good improvement here
@ThinkingandTinkering5 жыл бұрын
@@lowerthetone you really don't want to use an audio amplifer - it's just what i had laying around - the best thing would be to design a control board specifically for electrostatic speakers
@KravchenkoAudioPerth5 жыл бұрын
You are missing a pre-polarised stator to get this working properly. Plus a flyback transformer is a dismal choice for the A/C side of the system. Not the most well thought out on the physics side of how an electrostatic loudspeaker works. Most ESL's are using a very high resistance film. Your graphene film will be a low resistance setup. The low resistance can work but you will have a harder time keeping a proper set of stators charged.
@lamar75923 жыл бұрын
obviously his design is different than conventional ESLs, but clearly there is potential in this direction, and I can see some advantages over the traditional design.
@drrobotnik53763 жыл бұрын
I just looked up electrostatic speaker, and they cost $8000.
@zer0b0t5 жыл бұрын
Electrostatic speakers are not famous for sound quality but there's a big potential for experimentation. Like trying multiple layers, multiple frequencies, maybe one layer but with different areas for different frequencies... Have fun :)
@michelslenter83254 жыл бұрын
Electrostatic speakers ARE famous for their excellent sound quality. Just listen to STAX headsets or Martin Logan ESLs
@arendvandam77554 жыл бұрын
Since when are electrostatic speakers not famous for their sound quality? The oldest commercial ones, QUAD's ESL57, was elected in January 2000 as "best audio product of the 20th century" by Hi-Fi Newes and Record Review.
@quant201111 ай бұрын
"Easy" - you just need a lab with $19k in equipment and electric engineering knowledge from 6 yrs of studies. Very easy. anyone can do it after 11 hrs of work!
@jeffreyrood87555 жыл бұрын
This is something I never really thought about. Thank you again for an awesome video.
@ThinkingandTinkering5 жыл бұрын
cheers mate
@miclairmiclair8763 жыл бұрын
@@ThinkingandTinkering hi Robert , the high voltage generator works with DC voltage and amplifier works with ac, doesn't that mean it shouldn't really work? I'm trying to make one and I needed your clarification
@Hudsonlee19542 жыл бұрын
@@miclairmiclair876 How high should the voltage be? Thanks