1km fm transmitter circuit diagram
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- เผยแพร่เมื่อ 13 ส.ค. 2020
- This circuit is for educational purposes only and I take no responsibility for the wrong behavior of this circuit. It is only to know how radio transmitters and receivers work and not for personal use and when designing it must review the regulations and laws of the country in which you live about licensing such circuits
1km fm transmitter circuit diagram
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1 km range fm transmitter circuit diagram
simple 1 km fm transmitter circuit
1 km fm transmitter circuit
1 km fm transmitter circuit diagram
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Brother could u send ur watsapp no I wanted a circuit for running a motor if u don't mind or I can forward my no, my electronic knowledge is quite poor
I have the minitrasmifter kn medium wave original U S A 1955 the Inch Bud wo 6a modificated for input and trasformer 100 w?for electriic voltage europe transmiter on seven meter of electric field of 1,5 mm black color and the vertical antenna fm radio car
Sir please help me with the value of the blue resistor you used in this circuit. Thank you
@@joshuamwansa4407 It is not a resistor. It is a 1 microhenry fixed inductor. Also known as an RF choke.
@@eziomonico7173 zona aq
When I was 14 or so, I and my friend each made an FM transmitter. My one had only one transistor (BC169 c). We lived 300 m from each other and we were able to talk to each other with perfect quality. I had a simple dipole antenna that I had made, of proper calculated size, connected to my transmitter. I suspect it would have worked fine even with twice that distance.
I need to make something like that. Could you please help me?
@@MegaTechno Depends on what help you need.
Line of site?
Very cool that the two of you pulled it off!
Do you recall what power supply you used? We’re they tunable or cristal radios?
@@eugenecbell They were tunable, a small adjustable capacitor and a small coil, so no chrystal. I used a battery, it was probably a 9 V battery.
Собирал давно примерно такую же схему. Но каждый элемент очень точно подбирал. Резистор в цепи базы генератора для установки тока. Подбирал конденсатор между эмиттером и базой по максимуму амплитуды на выходе генератора. В моей схеме стоял еще конденсатор параллельно резистору в цепи между эмиттером и плюсом питания. И самое главное, выбирал оба транзистора с максимальным коэффициентом усиления. У меня их было около 50 штук. Между усилителем мощности и антенной ставил удлинительную катушку, чтобы уменьшить длину антенны. Передатчик работал на 200 метров. Частота была стабильной, но из-за уменьшения напряжения батареи начинала медленно смещаться в большую сторону. Диапазон около 100-105 MGz. В колебательном контуре использовал конденсатор постоянной емкости - это для стабильности частоты. Но лучше использовать кварцевую стабилизацию.
Translated (с русского): Collected for a long time about the same scheme. But each element is very accurately selected. Resistor in generator base circuit to set current. I selected a capacitor between the emitter and the base according to the maximum amplitude at the output of the generator. In my circuit, there was also a capacitor in parallel with the resistor in the circuit between the emitter and the power plus. And most importantly, I chose both transistors with the maximum gain. I had about 50 of them. An extension coil was placed between the power amplifier and the antenna to reduce the length of the antenna. The transmitter worked on 200 meters. The frequency was stable, but due to a decrease in battery voltage, it began to slowly shift upwards. The range is about 100-105 MHz. I used a constant capacitor in the oscillatory circuit - this is for frequency stability. But it is better to use quartz stabilization.
Слабовата игрушка и шумов много
Gracias, aun cuando no se nada de electronica su estilo claro y sencillo da luces y me abrió otro ámbito de lograr éxito en medio de las carencias y dificultades desde la República Bolivariana de Venezuela un abrazo
HOLA MUY BUENO EL CIRCUITO IDEAL PARA HOBBY Y CREATIVO...LO FELICITO AMIGO... GRACIAS POR COMPARTIR...
estimado usted realizo el circuito ya? le dio resultado? podria corregirme por favor, el elemento azul es una resistencia de 100 ohn?
I suggest using drill rod for the power rails. Artists love the stuff. It solders & welds terrific, has a bright silver finish, and is strong enough to form the base of a executive desk toy that could look real swank! Ditch the cardboard.
@Nosmo King Thank you for saying it. I was cringing my ass off ! So much built in trouble!.
Absolut toate criticile sant bine intemeiate, justificate, de bun simt. Ce sa mai adaug ,cea cu tehnica precara a lipiturilor este TOTALA. Ma bucur ca observa si altii aceasta procedura infantila ,total inadmisibila.
What is drill rod? And, if available in the UK, I wonder what we call it?
From my experience, FM transmitter use only 2 transistors is not possible to send in range of 1 KM, it is possible to send in the maximum range of a one hundred meters.
Max 100 meters
Use a big antenna
I agree theres no chance of a 1km range i built bugs as a hobby for years this type of transmitter is very basic
@@noterbel75 of 900mtr length towards receiver!?😜
It needs a power transistor capable to oscillate easily. I made a test using germanium power transistor successfully having range of 2 km. Of course enough of power supply is needed. And IT BECOMES REALLY HOT - so a huge heatsink is needed.
Thanks for your video, salute from Venezuela..!
Muy bueno
Saludos desde Argentina
You provide such great material to your viewers. I appreciate all of your hard work. I truly appreciate it!
Good work.
But: 1 kilometer of range, with a Collpits system, 2N3904 transistor, and a 9v power supply, seems to be overselled.
I tested 2-transistor transmitter with full-size antenna (halfwave dipole) from balcony on 22nd floor. The distance was near 3 km. Measured output power (using oscilloscope on 50ohm load) was about 200mW with well-tuned MATCHED impedance network (pi filter). The circuit presented here uses very short antenna and no matching elements. It is capable to transmit at least for couple hundreds meters.
Hello, I have a design for a similar fm transmitter and I learned that if you keep all the component leads as short as possible and everything as close to each other the circuit doesn’t drift from frequency as much and operates clearly. For the tank circuit I use a 5.5 to 20pf variable cap with 6 turns of 22awg wire.
I will try your design as well looks very nice 👍🏻
You said six turns of 22 Awg wire what is the spacing how about a quarter wave antenna that would help out a lot
The closeness really helps with the parts the 4.7 microfarad electrolytic exchange that for a tantaluma the same value
0
It don't mater how short the leads are, it could shift just from moving the antenna in one direction, or moving the battery in the other. Also I have seen a transmitter shift just by putting your hand next to the thing. The only fool proof way of minimising changes is to shield the whole transmitter in a metal grounded box with minimal contact with the antenna or power source.
oh very nice i used to build the little practical wireless projects but some of them did not even after checking the circuit diagram it was only when i started doing college work in electronics i understood the theory more so yes the editorial in these magazines make mistakes so i looked in the junk box for that project and fixed the problem. guy at the college built a sound to light unit which was more complex lots of components that did not work either he asked the college tutor have a look at but he could not fix it either hed done a great job of assemble it looked great but would not work more editorial mistakes i recon
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مشكور على مجهودك تابع انك محترف بمعنى الكلمة
شكرا لك صديقي اتمنئ ان تكون صديق دائم للقناة
LC tank circuit oscillators are inherently unstable. The coil is the source of the problem. The inductance will change with the ambient temperature, and also by proximity to a human hand. It is impossible to shield the coil against this. The only solution to frequency drift is to completely isolate the entire transmitter from human contact, with the microphone and power switch at a distance. There will still be temperature-related drift because of expansion/contraction of the coil, which changes its inductance.
Crystal oscillators are the best and most stable.
true
Катушку можно сделать плоской в виде спирали прямо на плате. Ее геометрические размеры будут более стабильными
Hace tiempo cuando empecé con la.electronica usaba este circuito para interrumpir la señal de radio o TV de los vecinos, solo lo hacía por diversión,luego empecé a experimentar con una mini estación de radio, buenos recuerdos
Me gustaría obtener un poco de tu conocimiento para empezar con esto de la radio
@@erikcorrea9694 Hola la electrónica es un mundo fascinante aunque parece que la están limitando un poco al público solo venden tarjetas para reemplazar nada para hacer desde 0, en internet puedes encontrar revistas de los 90 como saber electrónica se aprende bastante con ellas, saludos
I love your circuits. They're beautiful, functional sculptures.
I have built many of these years ago. So small, they snap onto a 9V battery. Crisp and clear and travels almost a mile away with 9" antennae.
Hello! Good work! 👍The output impedance of LC resonance circuit is quite high - the second transistor (low input impedance) connected to the collector of the first transistor (high impedance).It leads to essential instability of frequency and big influence of antenna on frequency. To fix it - connect the base of second transistor to emitter of first transistor. Both impedances are low - it probably will works well. These transistors have a transition frequency (in common emitter schema) equals 300 MHz. It means the gain equals 1 to 300MHz. On 100MHz it probably be 2 or 3. The input impedance of the second amplifier is dramatically low - because is a Miller`s effect. To solve this problem - you can using a simple wideband transformer (twisted pair made from two wires 0.25mm in insulation and NI-ZN ferrite as a core) to matching the generator impedance with an amplifier (second transistor).
Hlooo
Ваши способности в объемном монтаже восхищают! Давно забытая технология. Даешь точечную сварку соединений!
Навесной
excelente video me trajo grandes recuerdos de mis primeros experimentos en radio aficionado saludos desde colombia lo que siempre hay que tener en cuenta en estos tipos de circuitos transmisores es el blindaje de la frecuencia es muy importante para que la señal trabaje en una sola frecuencia canal o banda y sin interrupciones
Y también por el tema de la capacidad distribuida. Las bobinas deben estar lo mejor blindadas posibles a tierra.
estimado buenas noches, me podria dar una mano con los elementos utilizados, el elemento color azul es una resistencia u otro elemento
I really enjoy these builds. They remind me of the point-to-point wiring of many tube-based circuits Ibuilt in my youth but there is also an element of art to the designs.
Are they as stable, efficient or sophisticated as they could be? No, but would they be as interesting or as accessible? I think not.
Keep up the good work!
showing a ladder diagram build nice
Stan,. Why they don't use Integrated circuit to built FM radio transmitters ? Thank you?
Thank sir best gide circuit diagram explain for fm transmitter information video..👍
This is just a single-stage oscillator. The other transistor is an amplifier for the audio input. The output power is probably about 10mW or less. I doubt this would reach 1 km unless you connected it to a dipole antenna and stuck it on top of a big hill. Used as shown, it will probably work around the house, but no further.
This is unsable bullshit
Dear
Do we ever need to transmit upto a km ?
Almost everyone requires to transmit anywhere within 5 to 100 meters maximum (15 to 300 feet). And even that also is very good result.
@Ravil Eshmetov
Very sorry sir.
I do not understand this language.
isn't right, second transistor in that circuit is a rf amp, shitty one but still, it's being fed directly from oscillator output (t1 collector) through 10p capacitor, and it has 1uh into its collector, with those parameters it should amplify rf for some extent although it's quite unstable design especially with that stupid variable capacitor.
Like 10meter
Very cool, thank you for sharing
Дуже добре. На мою думку результат буде кращим якщо зібрати передавач на монтажній платі з максимально короткими провідниками. Принаймні не буде плавати частота передачі. Правильно налаштована антена збільшить радіус дії передавача у 5-7 разів. Цікаво. Який КСХ у такої антени?
Great content my friend thank you so much
Love this one and wish I could solder semiconductors as well as you. Thanks for sharing and all the best.
Thank's My Friend for video 👍
Hola Kr felicitaciones, cuando montas uno cencillo en AM
Very cool. Very nice soldering technique too I noticed you are very patient letting it cool and harden.
thanks fu ur humble and easy understanding lecture
This is a basic transmitter, it contains both AM and FM modulation because of the sidebands. The reason why they call it FM transmitter is because its frequency is within the FM band but actually it is a basic transmitter. It can never reach 1 km. 2N3904 transistor has only 625 mw coollector dissipation, that means it is the maximum wattage, at 40 v. The power supply is only 9v where wit will get 1km?
I've got 1km no problem.Ok my rx was very sensitive with a 5 element beam.
73.G7HFS/PA3IKH
I remember building something like this it a microphone it was only short range more components the reception was amazing it fitted into a matchbox and could be picked up on any fm radio
me too in 80s
Podrias hacer uno de 20 km la verdad esta muy practico
Neat. Circuit diagrams are also neat. Reading resistor color bands when you're color blind is a fruitless endeavor.
your problem
There are apps that use the camera or an image and give you the name of the color you choose. You might wanna give them a try.
I blame our mothers!
Ouch, yeah I can see what you mean. I know of some one who is color blind Its no fun at all. If my memory serves me isn't there an app for color coding? Just a hunch.
Simple transmitters like this is not frequency stable. My better half has been doing different FM transmitters using all kinds of transistors, resistors, capacitors, coils some by hand and others made professionally, applied a small audio signal. With messy results of frequency shifts all over the FM band, even interfering with an analog TV. My man has used a digital frequency counter, and took measurements. Some of the frequency measurements went from 72mhz all the way to the upper uhf band. Audio was very distorted. I questioned its FM regulations with the FCC, and was told that the transmitter had to stop operating if it is shifting frequencies all over the FM band. Serious consequences can be issued to the operator with fines up to $25,000 per day of operation. The FCC suggest to go to a certified FCC regulated kits, with the parts all included. Much easier to build, and giving details on how each part plays a roll in its stable operation. Basically the FM transmitter was of a poor design, and must be reconstructed for stable operation. The design that is implied in this video, looks very similar to what my man has made in the past and is nothing new to my better half. I strongly caution that if this circuit is unstable in operation, do not use of you may get a visit from the Fed's. Interfering with the FM band is a felony, and can be punishable in federal prison minimum of 5 years and or $25,000 fine. You will get a warning for the first time offence, but after that you're on your own. I personally wouldn't go to crazy with the idea of building a device like this, unless you know much math and how stuff like this works. My man has hundreds of RF and high band FM transistors for transmitters, but will not be crazy enough to build such a simple unstable circuit. Just word from mouth, and be careful with this project. Simple easy way to play safe. There are fun FM transmitter kits on eBay for a few bucks, complete with a board and instructions on what part goes where.
I appreciate your hard work. Congratulations in educating making like this one
You'll get better sound quality by using a varicap diode reverse-biased through a resistor, and capacitor-coupled to the tank (LC) circuit, driven from your audio-in pre-emph network . That's what I did a few decades ago.
The range should be kept to a few dozen meters, and not boosted (as you could with a following higher-power stage or higher gain antenna), because besides being illegal, the signal would contain too many sprogs/sidebands and could cause interference in other bands, including aeronautical emergency frequencies.
How will it interfere with the aeronautical band? Band II harmonics do not fall within the aeronautical band.
@@smorrisby True. What I should have said is spurious frequencies. It's likely this simple circuit will generate some.
😎🧊 ol'school cool 💯
@@ACELog agreed, the simple circuit will shift into the air bands, because it happened to my better half. Very unstable shifting will swing also in the lower TV bands. Its happened as well. Such a transmitter can shift down to the low 50 Mhz up past the 109 Mhz range.
@@hollytimlick9470 Yes. Only a crystal-controlled transmitter can have the required stability. But then, remember it's not legal (in the UK) to operate at that transmit frequency anyway.
A legal frequency (in the UK) would be to operate (stably and within power limit) on a radiomic (UHF) channel; maybe use an actual radiomic tx/rx?
I tried a bluetooth portable speaker, but the latency (delay) meant I got an irritating fraction-of-a-second delay that I could hear. It would have be ok had I not been able to hear both source and receive end at the same time.
Genial.. Me recuerda uno que hice,.. Pero me trajo a la cárcel..pero solo tenia 15 años de edad, y para salir tuve que arreglar un radio viejo de transmisor de la jefatura, de puro transistores.. Que recuerdos aquellos.... Me gusto este video..
Haha 😃
Who needs a PCB? Nice work!
You don't need a variable capacitor for tuning these little transmitters:) I built something similar decades ago with one transistor, a little speaker from an old radio in the emitter as a mike, a 10n cap down from base to provide common-base pre-emphasis, the little coil in the collector and a 25k pot to base to tune it. Oh - and a 220 res above the coil to limit current and aid tuning. 1.5V and about 50m range. Yes, if you breathed near it, the freq changed:) No, I don't know in exact mode it oscillated in, or how exactly the freq. changed with DC bias:)
При дыхании на катушку индуктивности, меняется его индуктивность, он начинает механически вибрировать. В общем получается частотная модуляция сигнала. Можно использовать как аккустическую схему модуляции частоты
Absolutely beautiful thank you
Hola 👋👋👋.
Muchas gracias por el vídeo.
Saludos en Dios.
6п3с и ГУ 50 воспоминания детства !!!
Thank you for building & uploading! 🇺🇸 😎👍☕
The problem here is that if this is an FM transmitter then it's more than likely operating in the 87-108MHz band. At these frequencies the length of a lot of those wires are a substantial inductance and therefore affect the circuit performance. I'm also almost certain that some of the values are given incorrectly looking at the colour rings although that may be camera colour rendition.
Another thing that puzzles me is how it can work with the supply voltage reversed. The transistor 2N3904 is an NPN so the base needs a positive voltage relative to the emitter yet the first time power polarity is shown V- (or ground) is connected (at around 2:44). later in the video when the coloured wires are introduced this is corrected, but for the level of skill for the people I'm guessing are viewing this they stumped as to why the parts blow up, or why it just doesn't work.
I would suggest that if anyone wants to build this that they should build it on Veroboard and try and keep the connections as short as possible.
I can't vouch for the values being correct and I have neither the time nor inclination to determine what they should be. Just don't be surprised if it doesn't work.
All I can say is that the basic concept is functional.
Underrated comment
I don't quite understand... I would like to assemble this wiring diagram. Please tell us in more detail what exactly it would be worth changing?
Thank you in advance!
Vous êtes vraiment meilleur bravo
I got this knowledge.
Thank you,
We are always appreciative
Good redio ki renj bata rahi 1km
itne parts lagne ke bad ye result
Good job
this is the best example how not to do high frequency circuits. use closest possible connections, use common island for connections. more capacitors on power line in a few points.
Dlaczego tak?
@@wolkirs6933 w technice w.cz. musisz brać pod uwagę zjawiska które w technice innych częstotliwości mają marginalny wpływ. na przykład Kawałek drutu jest już cewką o jakiejś tam znaczącej indukcyjności przy wysokiej częstotliwości. Z pojemnością pasożytniczą będą tworzyć niezamierzony obwód rezonansowy. Kawałek zamkniętego zwoju w pobliżu cewki obniża jej Q. Itd itp. Zasada nr 1 jak najkrótsze połączenia i prawidłowe odsprzęganie a nie jeden ceramik na końcu schematu to jest śmiech na sali. Elektronika jest piękna dlatego że jest tak odmienna i zdumiewająca czasem dla zwykłego zjadacza chleba (technika mikrofalowa, radarowa na przykład i sposób rozchodzenia się energii w falowodzie vs przepływ w zwykłym kablu jack)
Inny pasztet że nawet nie są dane kondensatory przy lm.
MANTAP TIADA HENTI TAMPA INOVASI....
I made a FM transmitter with 2 BF 199 transistors and two coils. It was very sensitive and produced a very high tone when it kept near radio. Its range was about 300 meters. Sound quality was best and it's worked best with just 1.5 v perlite cell. For better result you must keep the components very close to each other with shortest connecting wires. use of veroboard would be a nice choice to make it more effective.
Pls. Send me the daigram. Thank you sir.
Can you send me your circuit design?
Pls send schemetic
thank you for video.
Cool video thanks for posting 📻👍
I build an fm transmitter with one transistor 45 years ago,with 2n2219
With very good sound with a reach of 2km.
I was a little bit later 37 years ago, with a BC547 and a 2N2219, a folded dipole with a balun as the antenna. Back in the day there was no local radiostations between 104 and 108mhz, so you didn't need that much power for a few km of distance. Those were the days :)
Thanks for sharing
FM modulator is a more suitable term, 10 to 15 milliwatt power output on the final transistor stage. (to distinguish them from 1 watt to 5 watt FM transmitters).
Thank you for the information!
What would you use this low frequency for? Sorry I haven't got into radio so much.
Nice two stage 200m 👍
молодец. достаточно аккуратно.
A simple explanation on the circuit would be nice. How are the values of resistors, capacitors determined?
It's a fake video, meant simply to promote JLCPCB, most of this fake channel's videos are just garbage.
You'd need several courses in electronics and circuit analysis to understand how each component is selected and connected.
@@yruhatin100 thank you
@@yruhatin100 Here we go, Albert Einstein said if you can't explain how it works to a child it means you don't understand it yourself.
look up RC and LC circuits
Amigo quero fazer um rádio. Amador tem como fazer
Passa as instruções
Instead of music explain the circuit diagram and it's functions
looks like he copy pasted the schematic from a DIY kit you can buy on cheap chinese websites.
Well done sir
Gostei muito desse transmissor
Beautiful
Because for me am very interested in electronics and I believed same thing to other people's maybe some will try so pls try to explain the components where to join them together (example resistor must to join capastor positive or negative then join maybe transistor and so on)
EXCELENTE
Transmiter FM radio
Oke deh the best
Terimakasih 👍
Nice sharing
Amazing,incredible....
مبدع
Creative video, thanks :)
Love this more power to this vlog
I can cover 1/2 sq. mile at those frequencies with a Hackrf One and an outdoor antenna. Literally the output device is the size of a grain of sand and that's with mpx, rds and hd.
If only they did point to point circuits this neatly back in the day before circuit boards.
they did
Muito Bom
Very very good thanks
From Barcelona, Spain.
Mantapp boss
New to this was just wondering i searched for c-1nf and c-100nf to buy no results is there alternatives any advice thanks in advance
great.
The problem with this circuit is that it’s not stable on it’s frequency and will drift if it gets a little bit warm over time…
right, for a stable frequency a crystal oscillator ought be needed
I suggest transmitter should have stable constant frequency
А нас ещё называли радио хулиганами 😂😂😂,эх, золотые 70е,вот ведь время пролетело,и все дедушкой зовут.
Всем привет с Кабардинно Балкарии 🤝.
Legal gostei
Like the dry joints!
Nice 👍👍 🇮🇳 || Kuki
I see you are connecting the components exactly as drawn in a logic circuit diagram without using circuit board
You are from Malaysia. my friend
@@ebramnady2250 What is the relevance to the comments??
@@OzzieWozzieOriginal I am a subscriber to your youtube channel , do you want to be friends?
this one is legit
How you get feedback of damping in LC oscillations
Vídeo muito bom.
How this frequency modulation work
Is our input signal is in also frequency modulated
I am obsessed with electronics. Do you advise me to learn from books or the Internet?
Good work
Thank for skill good