Homemade theremin using three radios
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- Опубликовано: 11 сен 2024
- Before buying a professional instrument, you can practice playing this 3 radio arrangement, (I suggest Radio Shack model 12-889, see on site www.radioshack.... easy to work with) to make sure you are a gifted theremin player. You can see plans on • Post . You can also check plans at • Post .
Ver versión en español en • Theremin hecho con 3 r... .
Tuning capacitor... is what makes time travel possible...
Well come to future
In your dreams
Tuning, A.K.A., "FLUX" capacitor.
An old radio is normally the best choice, since it is a superhet almost for sure. Take the cover off and see if you can touch the variable capacitor. If that detunes the radio, you can use it as a variable transmitter indeed! Watch my "Detailed Preparation" video as a guide on finding the variable capacitor's oscillator section.
Well, I'm pretty stunned. I just did this. Set this up at home. Very cool. Now, I don't really have anything to do with it, but... very cool. Took me 20 minutes (not including fifteen minute trip to Walgreens to buy two $7 radios).
Exactly! That is the way it works. I am working on a theremin made up of several radios, maybe 5, which can control the volume too, but that would be a much more elaborate project. I will try to keep things as simple as possible. It will not be very soon, though.
I tried this and it works very well. Anyone who is considering buying a single antenna "theremin" should try this first. It is a cheap and fun way to get acquainted with the limitations of a single antenna "Theremin". Watch any Theremin player and you will notice that they use the volume antenna as much, if not more, (which is often the case) than the pitch antenna. Thank-you eltunene - you'll probably save people a lot of money with this video!
I am glado to be of help! I enjoyed physics very much when I was in Junior high, unfortunately, I could not afford to go to the university. However, I studied electronics by mail, and I enjoy building gadgets. Good luck!
yes, if the small radio is tuned to, say 700 kHz, then the big radio has to be tuned to 700 + 455 = 1155, because the local oscillator in any radio has to run 455 kHz above the desired station, so if small radio is tuned to 700 kHz then its local oscillator will be running at 1155, which is to be tuned in by the big radio.
congratulations what a nice, simple cheap and interesting proyect ! i'll do early as i can , thank you !
Thanks, Alex, some folks have built it and it has worked fine. One fellow even plays it very nicely! Here is the link to that channel - ruclips.net/video/hcq7rDo31lc/видео.html
That is a fantastic project, the best build on something I've ever seen.
Thanks for your kind comment!! Some people think the Theremin is something like magic, but is really just an oscillator you adjust by bringing your hand near the plate of the tuning capacitor. It is very impressive, though, when a person plays it skillfully. A friend of mine built it and is very good at playing it!! ruclips.net/video/hcq7rDo31lc/видео.html&ab_channel=Atoms4Peace
@@eltunene I work at a dump and have a lot of radio options, I'm going to put it together then make one with my Granddaughter this school holidays, thank you.
Dude! You saved me! I wanted to do a Theremin as my experiment but I didnt find a method as simple as this, and now I can do it! Thanks and good vibes man!
I am glad you liked my project! Thanks a lot for your comment!!
Hooray! Please post it as soon as you can, I am happy you have it working!
Extremely cool, I'm inspired to try this.
Remember all radios must be "old type", not digital, so you can fiddle with the oscillator and use it as a transmitter. Any questions, please drop me a comment!!
You did the right thing by tuning all three radios to the same frequency, that is the basic arrangement; however, if a station is broadcasting at that spot, it might interfere a bit.
Yes, mystfire, as a matter of fact, all three radios I used are AM-FM radios. I even disconnected the FM antenna from its original FM input and used it as a pitch antenna. They have to be in the AM mode, the FM function is simply ignored, it is not needed..
I just recently built a theremin From scratch. It's mounted in an old 1933 Philco floor model cabinet
Wonderful! Those radios were really good, I used to be a radio technician and fixed a lot of old Philcos!!! Did you post a video so I can watch your theremin?
You need 2 transmitters (one of them fixed and the other variable through the frequency-control antenna) and a receiver. Since every receiver is also a small transmitter, that is why I am using 3 radios, instead of making or buying special transmitters. Only one of the radios is used as receiver and the other two as transmitters.
thanks for your kind reply!
today i managed to find out what was wrong, the receiver radio's AM switch was not working and so it was actually not in AM mode! i linked across the switch with a wire, and the whole thing worked! Thanks for this guide!! its a whole lotta fun
If it gives you a pitch when you turn the knob of the fixed transmitter, then there must be another wave being received by the receiver. Please make sure the receiver is at a totally empty area of the tuning range. Then when you turn the knob of the fixed transmitter, it should create a silence in the receiver. Now, if you turn on the variable transmitter and tune it at a spot approximately the same as the fixed transmitter, it should give the pitch, try different positions and closeness.
Thanks for the tutorial, you may have saved me a trip to the bank.
What a fun way to get acquainted with the concepts of the Theremin! Thank-you for sharing this. I'm looking forward to the experiments that involve the volume antenna.
This is incredible! I'm an out of work engineer and I'll say this is definitely something where I want to learn every detail of how this works. Expect a video reply if I can get a good volume control working.
Not at all, I used a small radio because I had it at hand, and is a way of identification, but the radios can be any size. The only condition is that the radios are all of the AM type, and that the radio where you are going to hear the sound has a speaker (if you want your audience to hear it). However, it is better if the three radios have speakers, because the earphone wires may interfere with the action of the antenna.
If you use your alarm radio as one of the transmitters, don't forget to set the time (not necessarily the correct time) to prevent the flashing figures from changing the frequency of the oscillator everytime they flash, since they load the power supply of the radio and that affects the frequency..
What you can do is turn the trimmer of the local oscillator in the radio used as receiver, in order to tune up higher than normal end of the band, which is normally 1600 kHz. If you turn this trimmer (little screw on the tuning capacitor, the one which untunes the radio) the radio will be able to tune, let's say, to 1700, thus avoiding the highest frequency AM stations, which go as high as 1600.
Then you must restart the process of tuning the "transmitter" radios a bit higher.
That's amazing!
Dear Danilo, thanks for your comments!!
It's great. Thanks!
Thanks, Alex, for your kind comment!!!
Ah OK, no problem to find it.
Congratulations for the experience!!!
Wow! This is really cool!
Hi, Barbara, thanks for your kind comment!! By the way, a friend of mine built it 8 years ago and is great at playing, take a look ruclips.net/video/hcq7rDo31lc/видео.html
@@eltunene That's awesome; he sounded great! I'd love to give it a try too! Thank you for sharing this project and the plans too!
I just made one and it works, Thanks! I am going to put up a video as soon as i find my camera!
One simple way to add a volume control would be to connect an antenna to the oscillator of the receiver also, and as you move your hand close to it, it would "detune" the receiver, causing the volume to go down, but if there is interference in your environment, static would go louder when volume goes down. Another way would be to add a pedal, but that demands some electronic skills, If something comes to my mind to do it easily, I'll put up another video with the update.
This is a wild listen on headphones.
Thanks for your kind comment!!!
Simply amazing great for sci-fi sounds.
It does not have to be a portable type radio, it can be any AM radio (not digital). I used the handheld one because I had it at hand, but it can be a big radio, an AM-FM combo, etc. As long as you use only the AM function, any radio will do.
No doubt !!!!
That's clever ..
Brilliant !
Brilliant!
Brillant!
et voilà! ...
great video man I'm thinking about doing the same thing
Hi, Paul. You must use relatively old radios. Digital won't do. If one of the radios is a clock radio, ser the clock at any time you wish, but if you leave it blinking, it will interfere with the tone produced. In the video description, please find a link to box.com, which will take you to more detailed explanation.
Wow! Simply excellent! Thanks for posting the video response!
Dear faceless1; well, sometimes radios, especially new and cheap ones work on digital chips, and some are not even superhets (no local oscillator), however, please ask some of the guys who uploaded videos and actually made the theremin work, they can tell you the brands and model numbers of their radios. I used a Sony casette-radio combo, a pocket AM-FM GE radio, and an RCA AM-FM cd casette combo as the receiver, most of them kind of old, but other guys may have better options
Dear camelectric, generally, placing the radios with their oscillators as close as possible, by turning them around until the signal is stronger, you can overcome the static. However there might be cases where interference could be so strong as making the setup work at all. Rare cases, though.
@paidusi Thanks for your comment! I am just an electronics fan who loves to build rigs at low to zero cost! Please take a look at my solar power system projects!
Absolutely brilliant!! Thank you so much for this great inspiration :)
I'll try it out for sure!
dear bhm1712 - Is the large radio receiving the radio you modified? Maybe the small radio is a digital one, that would not work. By the way, the size of the radio does not mater, as long as they are superhets, that is, they have a local oscillator. Maybe you could post a video with whatever you are doing, and I could help you a little more.
For some reason, I just can't get the first two to cancel each other's static. Any idea of what I am doing wrong?
The process I tried:
I tuned both to the maximum frequency there is, which in both is 1700. The I get the small radio (an old battery walkman) and hover over every side of the other radio, and it just never cancels.
I think I know what's wrong: The radio acting as a receiver (the one with the volume up) can be tuned to the high end, say, 1,600 kHz. Then the radio acting as a fixed transmitter must be tuned to 1,145 kHz, that is, 455 kHz BELOW, so the local oscillator will be running at 1,600; you shold find the "silence" in the first radio right there. If there is a radio station on that frequency, you can shift to some kHz above or below, to avoid the local radio station from interfering. Please let me know your results. You can find more detailed info at ruclips.net/channel/UCmjQnuJwV0FkjdEyi3099RAcommunity?lb=UgxMaRY04KntENjMyN54AaABCQ
@@eltunene Ooooh! It worked! Actually I didn't make the antenna part in the variable capacitor yet, but I will! Thanks a lot!
Fantastico! Lo que no he comprendido es la parte de emisión. Así que todos los radios se influencian mutuamente? Es decir que del pequeño tambien saldría el sonido si le aumentas el volumen?
Amigo, gracias por su comentario. El radio pequeño, al igual que los otros, puede ser usado como receptor. En este caso, está actuando como transmisor, en su bocina se escucha sólo algo de interferencia, pues está sintonizado a una frecuencia distinta a los otros. Los radios usados como transmisores están sintonizados de tal modo que al mezclarse las señales que salen de sus osciladores locales producen una frecuencia de batido de cero ciclos, es decir, ambos transmisores emiten la misma frecuencia. Al acercar la mano a la antena al transmisor variable, se baja la frecuencia de ese radio en particular, dando lugar a una nota resultante igual a la diferencia entre ambos transmisores. Mientras más se acerca la mano a la antena, la frecuencia se hace más baja en ese oscilador, aumentando la diferencia entre ambos transmisores, dando una nota más alta. Si se usa como receptor el radio pequeño, también funciona, claro, ajustando las frecuencias con la perilla de sintonía, la razón de no usarlo como receptor es que su salida se oye más "telefónica", dado su menor rango de frecuencias por su bocina pequeña. En cuanto a que se puede usar cualquier radio, no necesariamente, ya que los radios más modernos, digitales, pueden no usar un oscilador local, al menos no tan fácil de controlar. ¡Saludos!
I originally made this arrangement so anybody without any knowledge of electronics could put it together, however, a volume control can be added, but that would imply a more sophisticated modification of one of the radios, maybe include a fourth one, I would have to think about a way to do it, I don't have a clue right now.
@desr2395 Sorry, I had been too carried away by my solar power stuff and had not seen your comment! Would you please send me a private message with a more detailed explanation of what you are doing? It would help me know where the problem is. If you can post a video of what you have done so far, that would also help. Thanks!
Changing the volume involves dedicated circuitry. The original idea was to create a setup any person without a technical background could put together. However, I'll keep thinking and see what I come up with.
@Jdonovanford Hi! Well, the idea of this homemade project is to have something anybody can put together, without a knowledge of radio or electronics. Controlling the volume might require complex work in the radio circuitry. However, you could try connecting an antenna to the oscillator of the receiver, and see if detuning it by moving your other hand can render good results. Please tell me what you were able to achieve.
That's true, though it is a homemade instrument and I think the charm of any instrument has more to do with the tone than with how the sound is produced.
hi eltunene, i've posted a video (paranoise liberation front) of me playing a homemade Theremin with 3 old AM radios following your instructions. you can here it at minute 02.05, i'm the one at left, this is during the concert of my experimental dadanoise band TERVISEX in Italy.
thank you very much!!!
i'm using the 3radio_theremin a lot even my solo concert, i will send you other videos! you 're a genius man!
bye
pai (italy)
To all friends interested in building the 3-radio theremin, please see More from eltunene: Detailed preparation of the third radio for theremin.
Would it be possible to assemble the three radios in one chasis? Take the parts, solder them inside a chasis. I suppose we only would need one speaker.
Dear Addison, yes, of course, I presented the project using the 3 off the shelf radios, considering anybody with no electronic skills could put it to work, however, if you have no trouble transplanting the radio pc boards to a special cabinet, you must have some way to access the three radio's tuning knobs from outside the cabinet in case you have to retouch tuning on stage.
Something else, try not to use a clock radio, which can start blinking when unplugged and plugged into AC outlet, for it makes the radio power supply voltage to go up and down and affect the resulting tone. Please tell me how it came out!!
@@eltunene Thanks so much, you are so kind! I have no engineering background at all! But I take this as a challenge. My idea was to (1) unite all the power cables into one switch; (2) regarding the knobs, could it be possible to just have one knob for the receiver or for the variable transmitter, so the other two are fixed? (3) my received radio is a clock-alarm radio at the moment. Would it be possible to disable its clock capability?
Is there any document I could follow in order to understand better the project?
Yes, Graciela, there is a detailed explanation with drawings at ruclips.net/user/postUgxMaRY04KntENjMyN54AaABCQ in my Community. Thanks for your interest.
Dear bhm1712 - As a matter of fact, it is possible, if you have some electronics knowledge, to use only the radio frequency portion of two of the radios (as transmitters), put them in a box together with the r-f and audio pre-amp of the third radio, and run a cable from the a-f circuit to an external amplifier. That is totally possible, but requires some electronic skills.
Yes! But you would be using the volume control to raise the volume, whereas in a true theremin you would do so by moving your other hand close to an antenna. The approach is ok, though.
Of course you can use the volume control of the receiver, but the charm of the theremin is "play without touch", anyway, it would certainly work!
So the radio in the back is in fact the one producing sound?
so if you put that one next to the one with the antenna, you can use the volume button on it without interfering with the antenna-radio?
so you have the pitch and the volume you can play with...
I think MW is the designation for AM Broadcast band, since european radios sometimes have a LW, used in instrumentation, if that is the case, it should be okay to use a MW radio as any of the 3 radios. I am not sure, since it has been quite a long time since I used to be a radio technician.
This is a wonderful video!
Brilliant! And the theremin tone isn't bad, either.
Thanks, you are absolutely right! However, please take a look at Matryomin.
hey thank you so much! i just built one of these, my video of it should be finished uploading soon. much love.
well, we cannot see them, but we know they are there, and can use them. Some things in life are not visible, but they are there! Our eyes can only handle a very narrow spectrum, most electromagnetic waves we cannot detect by our senses.
@sketcheasy. Maybe the local oscillator of the fixed transmitter is not close enough to the receiving antenna of the receiver. Try different positions of both radios. Maybe the be fixed transmitter is not a superhet, try different radios, Do not use too small or digital radios, some of them are not superhets. Avoid closeness to computers, they interfere a lot. If you can post a video with what you are doing, including inside and outside views of the radios, that might help.
This is great!
Nice work! I've made my own theremin too.But when I trying to attach the coli to the antenna , the effect of hand decreased seriously. Without attaching the coil to the antenna, it can work pretty well, however it only reacts in a close distance about 5cm, I don't know why. And can someone please tell me the principle of this system? I did a research through internet, and I know how the frequency heterodyne in this system, but I wonder how the frequency in 2 1145kHz radios enter the 1600kHz radio, Do the radios become radio stations in here? How?
Dear friend. The homemade theremin is based on the fact that all radios (superhets, not digital) have an internal oscillator in order to beat against the incoming station and produce the intermediate frequency the rest of the rf section of the radio is tuned to.
This fact makes a radio act as a radio station. When you connect an external antenna, you "extend" the distance at which you detune the radio in order to produce the audible beat signal. I have another video further explaining how to connect the antenna to build a theremin. Besides this, under Community in my channel, I include some sketches on how the connections go. It is important that the added antenna is otherwise totally disconnected from the radio, except as indicated.
The link to my other video on the subject is: ruclips.net/video/CI5W7ujm93Y/видео.html
Besides, I still have another video about the history of radio, including a block diagram about the oscillator section of a radio (which makes the radio work as a weak radio station), this is in minute 1:50 of that video: ruclips.net/video/63aSgdNx138/видео.html
Thanks for the reply, I didn't know the antenna must disconnected to the radio before, I'll try :)
While I still not clearly understand how it works, so is like the IF(455) and RF(1145) mixed to produce an 1600 signal? But how the 1600 signal came out of the 1145 radio's circuit rather than stay in the the circuit? Due to speaker? But there is a filter which only allow IF to pass. Or maybe it's normal for a frequency signal to come out the circuit without anything help...?
@@hwahwa649 Let's call the radios "fixed transmitter, variable transmitter and receiver". When the radio used as a receiver is tuned to receive the signals from the fixed transmitter (in this case, the small radio) and the variable transmitter (the big radio), it will remain silent if both signals are identical in frequency. Say, If there is a difference in frequency in one of them with respect to the other, there will be a "beat note" which can be heard in the speaker of the THIRD radio. If the radio used as a variable transmitter has a piece of wire connected to its tuning capacitor, oscillator section, you can vary its frequency by bringing your hand (or any conductive object) close to the piece of wire, thus creating a frequency difference between the fixed signal and the variable signal. This frequency difference between both radios is usually within the hearing range, so you hear a note in the radio used as a receiver (volume must be up). If you move your hand away from the piece of wire (it does not have to be a special antenna) you raise the frequency of the variable transmitter. If you bring your hand closer to the piece of wire, you lower the frequency of the variable transmitter, thus the note changes its frequency according to the difference in frequency. Assume both transmitters are generating identical signals, say 600 kHz, the receiver radio will assume it's getting a radio station where there is a silence, no music, no voice, so it keeps quiet. If the fixed transmitter stays at 800 kHz, but the variable transmitter frequency is lowered say by 400 Hz (to 799,600 hZ), the receiver will interpret that as a station where a 400 Hz note is being produced. The same goes for all frequencies. So if you bring your hand close to the oscillator section of the variable transmitter, you will lower the frequency being produced and thus produce a note in the receiver. You can start by turning the three radios on and move the dial in the receiver to an empty space in the AM band, say 1,100 kHz (volume up). Now move the dial in the fixed transmitter to a position as if you wanted to get a 645 kHz station (volume down). Now turn the dial on variable transmitter to 645 kHz also (volume down). The two notes will "beat" and you'll get your audible note in the receiver. If you now slightly move the variable transmitter dial, you will get a changing note. If you do not touch the dial but bring your hand close to the tuning capacitor in variable transmitter, the note will change as well. That is the principle. If you add an antenna to the oscillator terminal of variable transmitter, you will have to readjust the dial, since the antenna will somehow detune it.
@ Chava Tarin Thanks for such informative and detailed reply. The working principle of radio theremin is more
delicate than I thought. But it makes me interested in learning more about it. Thanks again!
p.s. Do I need to remove the original antenna of the radio before setting up a new antenna without connect to radio?
@@hwahwa649 You can leave the antenna mounted on the radio, for convenience, but please disconnect it from its original wire, since this would interfere with operation of the theremin. Or you can forget about the original antenna and use a separate stiff wire as well, connected to the oscillator tuning capacitor, as I describe in the video. For more details about how to find the oscillator tuning capacitor, please watch my video at this link: ruclips.net/video/CI5W7ujm93Y/видео.html here I show how you can make sure about the terminal to connect the stiff wire antenna.
Dear Yantz11, I used different size radios because I had them at hand. They can be any size, as long as they are of the AM non-digital type. If you send me a personal message with your e-mail, I will send you an .rtf document with more explanations and drawings.
Hi! I am making this, and I have 2 radios. My question: I have an "jurassic" radio made by National, with LP disk player ^^. Can I use this radio as a VARIABLE TRANSMITTER? (but the AM sound of this radio is very good)?
I did this with 3 radios of my own, no problems with modding the 3rd radio, but i could not, no matter what i did, get the small radio to cancel out the static on the larger radio.i set the larger radio to 1500khz and the small one to 1045 khz. I fine tuned both radios and still could not get the large radio the receive the smaller radio signal, any tips on what went wrong?
If you come across a solution for the volume control please let me know, It would be wonderful if it is something simple everybody could do without any electronics expertise.
If you wish to download the theremin plans, please go to "more info" for this video and click on the URL
By the way, if a computer or a TV are working close to the receiver, they do interfere for sure.
eltunene, this is fantastic! But in a harsh electromagnetic environment, it must be awfully subject to interference?
Cant wait to try it at home!
Dear Stekkkkkk, when you finally put it together, please post a video of you playing it!
Can't you just use the volume knob on the radio to control the volume?
I think there are ghosts in this house.
has anybody ever thought or is it possible. to get the necessary circuit boards out of the 3 radios, and put them all inside one box, and instead of using the speakers, connect a line out to an amp instead? this way you could have a decent pitch only theremin that you sort of built yourself. You could tune in the necessary settings and then leave them at that inside the box?
Well, the idea is to ignore radio stations and tune in the signal from the local oscillator of the "fixed" radio as well as the local oscillator from the "variable" radio (the "small" radio and the "antenna" radio in my example. Avoid tuning in radio stations, for they cause interference. If I haven't sent you the schematics, please send me a personal message with your e-mail so I can send them to you. Hopefully they will be of help.
How exactly do you set the third radio?
Hi, Addison, please go to my Community and I have some drawings explaining how. The link is ruclips.net/user/postUgxMaRY04KntENjMyN54AaABCQ The third radio is meant just to receive the mixture of the signals from radios labeled "fixed transmitter" and "variable transmitter" please look at my drawings! There are text instructions for you to follow.
@@eltunene Thanks! I managed to do it :) Another question concerns the volume antenna: could we do the same as for the pitch antenna, and plug an antenna to the corner of the capacitor that controls the volume?
ok. it doesn't change pitch when i move my hand, only when i move the anntenna. how do i fix it? pleaaseee i want this to work
What can I do for change the volume?
Thank You!
Can use a AM/FM radio on the AM mode?
You are a hero.
Is it possible to control dynamics with this method? Or just pitch?
Why is it AM and not FM?
Dear friend, there are a couple of reasons for using AM instead of FM. Mainly, an FM radio receiver rejects amplitude changes in an rf signal. One of the nice features of FM is not being interfered by lightning, sparks and other disturbances that plague AM reception. When an AM station is at work, it modulates the strength or intensity of its carrier by adding "sidebands", which net result is producing a carrier amplitude modulated by the signal. An AM receiver picks up this signal and detects the amplitude changes as the audio being superimposed on the carrier wave. An FM radio does not take into account the strength of the signal as audio, but its frequency, by means of a special detector which will cancel out all amplitude changes but will interpret frequency changes (within certain limits) as an audio signal. When you are receiving the local oscillator of an AM receiver as if it were a "mini radio station", you have to mix the rf signals from both radios used as tranmitters, and you get the effect of an AM modulated signal being fed to the third radio which in turn produces an audio signal equal to the differences in frequency of both input rf signals. In case you are interested in building the theremin, I posted simple drawings in my Community showing the process, plus detailed text on how to do it. The link is ruclips.net/user/postUgxMaRY04KntENjMyN54AaABCQ
i just put it up as a video response, thanks
I was not able to find the tuning capacitor oscillating terminal in my radio. is there an easy way to identify it?
Dear Eye of the Forest, please watch this video where I pinpoint the exact terminal. I hope it helps! - ruclips.net/video/CI5W7ujm93Y/видео.html
Thanks, that was helpful. Unfortunately, I think my radio doesn't have one of those tuning capacitors, or its too small and I overlooked it.
Maybe your radio is a digital one, they are kind of complex, you need to get radios which are not too recent, otherwise they will not have a tuning capacitor as they used to. In case The Radio Shack model I mention in my video description is unfortunatelly discontinued, but do not get discouraged. You can send me a photo of the inside of the radio, hopefully I will find the capacitor.
Hm, can you alsof control the volume like a real theremin? Just asking. Great plan by the way! Thinking of building one too :)
You can try it, in theory it should work.
Could you explain it to me? It sounds interesting.
i wish we could see radio waves
cool as hell now i know what to do with all those useless am radios i hav lying round,and no im not being a smartass.i bought a few transister am radios woner if those will even work?
dear bhm, whatever you do, do not make your wife angry. If she is angry, there will be no hot meals on the table!
Greater wisdom is rarely spoken!
These days its hard to find AM radio...
ahh, i was so stupid, now, this whole thing makes sense!
-_-
nice :D
Ha, last audible words, we can hear the static from the radio
Thanks for your comment!! Some people finally got to learn how to play it. For a success story, please watch ruclips.net/video/hcq7rDo31lc/видео.html
I don't get the silence... the noise only gets less loud.
Well, you should have the radio transmitting the signal as close as possible to the radio receiving it, but some noise is tolerable as long as it does not interfere with the music you are producing. Maybe the oscillator signal from your transmitting radio is too weak, try using the receiver as transmitter and vice versa. The idea is to have the receiver receiving both signals, one from the fixed transmiter and the other from the variable transmitter. We are relying no the fact that most radios act as samall transmitters. The radios used as transmitters must be tuned at a low point of the AM band. The radio used as receiver must be tuned to about 450 khz above the other two. The volume in the receiver radio is to be high, whereas the other two radios must be set to zero volume. By the way, you have to use AM radios for this. If you are using FM radios it would not work. If you use AM-FM radios, make sure all of them are set to AM. I hope this helps.
+Chava Tarin Hi. thanks for your reply! Unfortunately I already tried all this. Two of the radios are the same type, they are both not suitable I guess. BTW they are FM/AM Radios set to AM. Greetings
Mhhh, the radios should not be digital, I even suggested some radios they used to sell at a very popular store at that time, but any radio which has a local oscillator should do. The receiving radio can be digital, but the others used as transmitters have to be old fashioned types. Have you read my notes on building the theremin at app.box.com/shared/kgdstzwaoc ? Please keep me updated on your rsults.
I will give this a try, i am an electrical engineer by trade! i cannot destroy the 2 larger radios i have or my wife will kill me. I will buy 2 small AM radios and get to work, if i do manage to do it i will post a video!
Anyone here after 2020
no, 2:12 PACMAN dies
not mario
:-)