The input audio signal from the mic penetrated to the base of the transistor, which modulates the LC tank circuit carrier frequency in FM … Resistances available range from 1 Ohm to 10 MegOhm. Our codebase uses I2C to communicate. Unfortunately, my project is unsuccessful as I can not get to work, no matter what I do. pls reply me soon. Does this circuit do actual FM transmission (Frequency Modulated Transmission) or else does it just amplify the amplitude of the input signal? please help me. This fm transmitter circuit is a quite fun project for electronics beginners so heres a circuit with the 2sc9018 transistor. but in analysing the circuit how Transistor Q3 performs the collective job of oscillator, mixer and final power amplifier? no other end of the coil l2 will not end up in the ground, connect a bipolar antenna to l2, Would also love full details of all components. Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. 175kHz Inductive Pulse Transmitter - This circuit is discussed in more detail in the Experimenters Journal. The reason they are adjustable is because according to tolerance differences in ALL of the components you will need to fine tune these two to get the frequency you want. The range of the transmitter when running at 9V is about 300 feet. A basic UUS 65 73 MHz fm transmitter circuit schematic which can be used as UUS oscillator with . Varying shapes, coupled with the resistivity of amorphous carbon can Hi, I’ve have made the circuit but it is not working and I have a suspicion that its either the transistor or the variable capacitors. i need fm tramsimitor which can transimit up to 15km. Please note that close FM radio stations can get reduce the range of the broadcast extremely. Sir, where I going to connect the L2 terminals/antenna to the circuit diagram? spose I have made a very basic FM TRANSMITTER having a 100 meter of rang. This video explains what frequency modulation (FM) is and shows a simple low powered FM radio transmitter circuit you can build. Ive put in the proper transistor, but now R12 is smoking and burning. BF494 will get damaged being a low power low current transistor. b. However, I am providing you with some hints in this scenario: All the resistors within the schematic will be required to dissipate less than 1/2 Watt, so you should buy at least 1/2 Watt power dissipation resistors; If you plan to plug your transmitter to a +24 VDC source, then you should use 36 VDC rated electrolytic capacitors (C1 and C4), otherwise, 24 VDC rated will do; C3 and C5, being Mylar or Polystyrene capacitors, they should be rated at 50 VDC which is a standard voltage value for these types of components; C6 and C7 “MUST BE CERAMIC CAPACITORS”… I insist… Ceramic Capacitors, and as such, they are normally rated between 500 VDC to 1 KV; last, but not least, we have C8 and C9… variable capacitors come in all shapes and forms, so their final voltage rating will be a function of your preferences. I have question on the audio input. pls help me what is the triangular symbol enclosed in a circle in receiver circuit. Sir i completed the circuit..and I have problem when i am going to touch inductor (L1) with my hands at the time i get the output with clear sound…when i released my hands i get only noisy output…..pls pls help me to get clear sound.. Just open or close the winding loops! device that uses the principles of frequency modulation to broadcast sound supplied at its input By using this I decided to construct a long range remote control Soldering surface mounted devices is not so hard and actually is quite easy. Description. I have worked on 100meters fm transmitter, but i will try this 2000meters.But what kind of antenna should i use? If possible, can you give me the position to solder the jack and what do I need more to solder (Ex: capacitor, resistor,e.t.c), Dear sir, I need a 25watt fm transmitter. sir, i am doing electrical and electronics engineering last year. The components required to build this project is listed below. Also, please to post schematic of 50″ LCD TV with 3D effex. Lastly i tried it with about 24 volt and it became really hot. hi i’m adnan my problem is i cant find some of the components to finish my projects. Electronic Projects, Electronic Schematics, DIY Electronics. Kindly go through text books to understand the design. Due to the spiral cut nature of the resistance it is normally aircored with 200 to 300 turns honey comb winding to 5mm width with an ID of 6 to 10mm.). 3672 Hz at the antenna; • Thus, following 5 degree temp. these are.. The audio signal to be transmitted is coupled to the base of Q1 through capacitor C2. please reply, I am very much excited to create this project, Thank you… please reply to my email address: roygee30@yahoo.com. shit thing about other transistor cases than TO220 is, that you can nowhere find cooling parts for them. element Carbon Film Resistors are not suitable for use in radio frequency circuits as they b) Use the formula λν = c: (x) (9.15 x 107 s¯1) = 3.00 x 108 m/s, then x = 3.28 m. 3.28 meters would be the perfect antenna size for this frequency; however, any multiple and submultiple of 3.28 will also work perfectly (6.56m, 1.64m, 82cm, 41cm, 20.5cm, and even a 10.25cm-long antenna would work just fine). Use the coil of a 24 Volt relay and it will work just fine! These variations in your transmitter´s central frequency will create annoying hissing noises in your FM receiver and chances are that you will lose fragments of information every now and then. This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. . yes it really 100% works it depends upon the circuit designer if he/she design it well it will work well, hi sir iam naren how many turns should be used for the inductor L3. You can calculate its size according to the transmitter´s wavelength. If you bought it online could you please give me the link? Walk back to the FM transmitter and turn it on. Remember that you are transmitting through this antenna, and if your antenna is shorter or larger than the transmitter´s frequency wavelength, it will not only transmit but receive radio frequency signals coming from itself. By WELLPCB https://www.wellpcb.com Follow. 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In this article we learn about a 1 watt fm transmitter amplifier with a reasonably balanced design specified to boost a rf frequency. Here we have adapted the same formula by first amplifying the audio signal, generating a carrier signal using an oscillating and then modulating the carrier signal with the amplified audio signal. TO5 casing gets a nice finned solid heat sinks. Will the transmitter still work? Set the radio to somewhere about 89 - 90 MHz. Warning Note:-In most countries-it is illegal to build personal radio station which covers large area. I can’t find that transistor easily. please give detailed description of this circuit, Sir if we give the encoded signal from RX600E to the transmitter it will be transmitted or not This is applicable for the transmitter and for the receiver too. Albert, from Uruguay, South America. PLEASE IAM ELECTRONIC MAN AND I WANT TODO ANOTHER ELECTRONIC SCHOOL IN OUTSIDE COUNTRY . hi sir im using part is Seetharaman seetharaman I don’t see how it can do frequency modulation as it doesn’t have a carrier signal. I was thus having constraints especially getting the components. Schematic PC board layout and parts placement Parts: Part: Total Qty. . can I used fixed capacitor c8 & c9 bcoz I donot found trimmer capacitor. if any 1 know it please send me information please pls……. Thanks. 3.8 out of 5 stars 26. ... 15 Watt RF Amplifier Using a 2SC2539 Schematic for 88-108 MHz. This circuit uses a HI-FI Stereo FM Transmitter IC. April 3, 2014 at 2:27 am I am Social Science graduate of Business Management. My rikavayamenta f. M the transmitter and 2 from Our webiste has thousands of circuits, projects and other information you that will find interesting. hi this is masthan. If this is your case (powering the transmitter from a fixed power supply), and before even striving to use C8 and C9 as your tuning devices, consider widening or stretching L1, L2 and/or L3 coils first, of course, affecting one piece at a time. i expect to build about 50m fm transmitter of few components, kindly help please,,,,,,,,,,, Let us say that for instance your transmitter’s central frequency if 91.5 MHz (you can find this on the FM receiver you plan to use to receive whatever information you are transmitting with this device), Calculate its wavelength in meters. The user interaction occurs through three input buttons and through a display for displaying messages. or Running it from 12V increases the range to about 400 feet. As antenna has only one terminal..would the other end of the coil l2 end up in the ground? Q3, along with its associated components, comprise the transmitter´s oscillation stage. With the increased ac. http://www.philipstorr.id.au/radio/technical/Resistors.pdf. Introduction: FM Transmitter Design. i have made 4 channel RF remote controller by using ask RF modules and ht12d and ht 12e .but its range is low about 60 meter please tell me how can i increase the range of this controller. SMD FM Transmitter. is it hollow tube or solid tube? Hi Seetharaman All your components are ok except choke. Voltmeter Ammeter can measure voltage with 100mV and current up to 10A with 10mA resolution. 1, How can i know the voltage of parts used in any homemade FM transmitter? The FM transmitter is a circuit that uses a very low power to operate and does uses (Frequency Modulation) FM Waves to transmit the sound. My phone number:+8801719974170, email: imtiaz2580@yahoo.com can you please help. C8 and C9 are Philips film dielectric preset capacitors. Take a long pipe of wood/ plasic. yah ofcourse every fm radio within your range can hear your FM, Plz tell me! Thanks. Albert from Uruguay, South America. Solder the inner ends to a coaxial cable, one to the coat, and one to the core. sir i want to find out the values of all componant. Hi Sir …. Adjust c9 until you start receiving. A simple single chip fm transmitter circuit with diagram and schematic using ic max 2606 which is a high … 2N3553 is the best replacement easily available or use BF494 3nos in parallel, Thanks for the cct. DIY FM Transmitter Schematic How Does the FM Transmitter Work? 500mW PLL FM transmitter 88-108MHz This PLL transmitter is controlled and the frequency is very stable and can be programmed digitally. I speak only of which can be heard in the house … can I use marker pen which is hollow tube? provide a variety of resistances. If you buy air- capacitors like the ones furnished in old radios, they can withstand several hundred volts between their plates, if you buy printed-circuit-board-mountable capacitors, they are often times rated at 50 VDC, so as you can see, the standard voltage rating for these components will have you covered. The post explains a 10 km long range transmitter circuit using ordinary components pcb fabrication also explained. what are the values of c9 &c8 capacitors for 99mhz fm output? This is long range fm transmitter circuit in vhf range. go get a life…if you don’t know about capacitor and coil how u will develop these things…get thorough knowledge on capacitor and inductor then start doing FM-transmitter. This 2KM FM Transmitter works on low voltage; thus, all of its associated components will do too. This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. (Hi venkatesh it is an rf choke to prevent rf entering the audio amp stage through power supply. are you sure L3 will be 250 turn or it is 25 turns? the third stage is only bandPass amplifier first order It wasnt quite clear, can u send a video or picture on how to make the coils and their connection. I want to know whether this one or the long range one works better. Is this metal film resistor fine? With a small change can set the frequency of 50-150 MHz. Get it as soon as Fri, Jan 8. The proposed long range transmitter circuit really is very steady harmonic free design which you can use with standard fm frequencies between 88 and 108 mhz. please give me the full details of the components used in this ckt. But I found another that says it replaces the 2N2219. The circuit having the RF oscillator of NPN transistor BF 494. i have made the rest of the circuit except inductance. what is c8 & c9? The input stage consists of capacitors C3 and C1, and resistor R1. Can you please upload a picture of the final pcb with tracks on it, Sir this ckt alrady redimade in which city and which on shope plz tell me. R1, R3, R4, R6, R5 and R9 are the biasing resistors for the preamplifier stage comprising of Q1 and Q2. Using a battery for powering the circuit will reduce noise. Help me. PC FM transmitter card for your PC Insert this into your PC (PCI slot) and turn your PC into a local radio station. Then, the sound frequencies coming from Q1 (voltage amplification) and Q2 (current source and impedance isolation) through R9 and C5, are algebraically added to the transmitter´s central frequency. use 350uH inductor instead of VK220J type RFC…. Mr.Seetharaman can i use other values of electrolytic cap in c4? With the help of such FM transmitters we can easily transmit the audio signals through the carrier waves with different frequencies. it is a TO-92 casing plastic transistor equivalent to 2N2222 even with a good infinite heat sink it will get damaged as it can dissipate only a maximum of 500mw. pls help. (use nonmagnetic screw driver for adjustment best is an ebonite rod), sir can u provide pcb circuit diagram of 2km fm transmitter. why L3 is used here? Another simple small FM transmitter schematic FM receiver with TDA7000 Turn your PC (monitor) into an AM radio transmitter Only works in Linux, but you can actually play an MP3 on your PC and hear it on radio without any extra hardware!! Can I input a MP3 line in the Audio Input? FM Transmitter Circuit Principle: FM transmission is done by the process of audio pre amplification, modulation and then transmission. This ensures that there will be minimal frequency disturbance when the screwdriver touches the adjustment shaft. hi sir, I don’t understand the connection of L1 L2 and of angina, can u suggest how long this work,…….. This transmitter should not be used as a room or telephone bug. plz give the swg number of l1, l2 ,l3??? The firmware is written in PBasic. So I assembled it on a piece of general purpose PCB, and it performed just better. Hello Sir, I have gone through the Long Range FM Transmitter project also. I have finished every thing in the circuit except inductor L3,any one please tell me how to create L3.THEN I can finish my project. I cannot get range to neighboring village of Kazadh-Bhi-Srinivas. 70. You have many great schematics but should also have full detail lists with them. Can u give me releted formule for this .and tecnique how to find that. The phikvensi should be separate from … 40pf in 39pf C9 is for tuning to the required frequency of transmission. is there any smd LM’s, can you please convert it to SMD please what are the value how can i convert it to SMD, you can send me the simulation of this transmitter in isis or workbensh or pspice About 91 of these are walkie talkie 3 are radio tv broadcasting equipment and 1 are fiber optic equipment. L1 and L2 will be with 18SWG super enameled copper wire and for L3 use 28 SWG 250 turns on 6mm former 5mm width honeycomb winding. can you tell me how the potentiometer is connected in the pcb?? Can anyone give me a ready made fm transmitter. It is also called trimmer capacitor. Its maximum range is 3 km. plz help me. Ye wind kis diameter PR kren air side PR ya erdgerd wind krein. i appreciate the circuit..i really like the range Hi Victor it should be 5 watt carbon / 100 ohms 2 watt carbon 2nos in parallel or non inductive wire wound 5 watts resistance, for 24volts operation of the circuit. This is basically a simple DIY hobby circuit and you can try it in your home with minimal components. i want to this type ckt making in my home. 18W FM Transmitter. You must use heatsink with higher than 15 v Any single wire can act as Antenna. The schematic of FM transmitter is given below: You need the following components for this experiment: 1. or just start your car and turn ur radio on. Schematic : PC Board Layout and Parts Placement: Parts: Part: Total Qty. $7.99 $ 7. Best of luck with your project! I created a cooling by myself. HOME STORE BLOG SCHEMATICS TUTORIALS DOWNLOADS CONTACT : Voltmeter Ammeter. And what about an Electret Mic? The maximum audio frequency transmitted in FM is 15 kHz as compared to 4.5 kHz in AM. Problem is, it gets so hot that I can’t touch it, though it doesn’t smoke or burn or anything. Presented below is an electronics circuit for FM receiver along with its full explanation. You can use a small piece of non copper-clad circuit board … can I used dipole antenna for transmission? It should look like this: ~| (~=cable; |= stick with copper wire) If you need more info, google “dipole antenna”, the biggest whip antenna possible, maybe twenty feet and dont forget the loading coil. 2. I want to verify the output of this circuit using the fm receiver built in our mobiles ( Since the frequency is between 88 and 108). Highly recommened type of circuit, because of the efford to success ratio. a) Convert MHz to s¯1: 91.5 MHz = 91.5 x 106 s¯1 = 9.15 x 107 s¯1 About 500 to 700 homes in the hy….. Transmitter will work 88-108 MHz and output power up to 500mW. The chip supports SPI as well but it was annoying enough to support just I2C so we don't have code examples for SPI! sir, Guide to build a 25w 2 miles or 3 km ranged fm transmitter circuit diagram schematic design. Please help me send the detail to my e-mail address…. Audio transmission using electret microphone: You can transmit your voice to FM radio with the electret microphone. can i make a RF remote controller by using this arrangement.please tell me how ? spose I have made a very basic FM TRANSMITTER having a 100 meter of rang. is it aircore? salami_azeez0619@yahoo.com …… Please, What is VK220J type RFC.Is it a coil or not.Please iam worried about that.pls help me. Fm transmitter circuit 10 km. Then solder a antenna plug,… to the other ends. $4.87 $ 4. For Q3, I couldn’t find the exact transistor, so I switched the 2N2219 for the BC337 NPN Transistor. 0.022 in 203 Is there any calculation used/applied to get the voltage of parts used. what does it do? Waiting your response soon, very soon!!! inductance value=?? narrow resistive path. It is an actual FM Transmitter! 2 Pack Audio Frequency Wireless Microphone Module DIY Kits Audio Transmitter Board Soldering Practice Set . Thanks to circuitstoday. Its maximum range is 2 km. Thanks for the good job. You can use the current S8050. change ! Which is correct process for designing L3? PLS REPLY! With this I have been able to construct this transmitter for my final year project. Plz tell me! The circuit works outstandingly well for a transmitter this size and caliber! By adjusting the POT R1 in the circuits you can adjust transmission frequencies between 88Mhz and 108 Mhz. ?plz rply me sir. would u plz explain abt L3 inductor? A great electronic repair troubleshooting tips and secrets for the technicians and engineers. what is the power rating of the 2km transmitter? wht is plastic former? hi i am BetaRajab, i ,d like to discuss this point. Please use 2N2219A with a good extruded alloy heat sink BC337 will not work. These “received” signals coming from within, will interfere with the signal you are striving to transmit and you will not transmit 100% of the energy generated by the output transistor (in this case Q3). And also show the signal modulation. You don't have to understand the precise working of the transmitter to build it. If you plan to power this unit on batteries alone, you will experience frequency drifting as the batteries begin to become depleted. if so, i would also like to obtain some info on the receiver. What capacitor needs to make 4.9 TeraHertz frequency? FM Transmitter Circuit Calibration Place the transmitter about 10 feet from a FM radio. abt L1 & L2 ? Quality Electronic Kits, Electronic Projects, Electronic Schematics, FM transmitter related schematics, circuits, diagrams, projects, pcbs and tutorials. Q1- Transistor- 2N3904. can we use any ferrite RF Choke instead of vk200j, Sir plz u cn explain how to l1 and l2 r connected????? how many round rolling by hand made this inductor, i have build a very similar transmitter kit with the metalic 2N2219 The simple one transistor FM transmitter consists of one transistor 3 capacitor two resistors. 2: Basic Stamp schematic diagram . drift will be 18.36 KHz at the antenna! 3. marker pen etc etc without any metal in them. I now want another help from you in making a long distance (above 3km in distance)…. Stability of this transmitter is not bad and PLL circuit can be added on. C8 for making the circuit to oscillate. Assemble the circuit on a good quality PCB. Hi-fi mono/ stereo fm transmitters lx-75 series; (12 pages) Summary of Contents for Decade FM-800. no. Start building this high range FM transmitter and see how your output comes. 102.1 FM's Photo Gallery - 3 102.1 FM's production studio. L1 and L2 will be with 18SWG super enameled copper wire and for L3 use 28 SWG 250 turns on 6mm former 5mm width honeycomb winding. Very high power output, medium sound quality, super sensitive amplifier and less parts: I like it! Thank you in advance. High stability and super clear sound. 3.6 out of 5 stars 38. This is basically a simple DIY hobby circuit and you can try it in your home with minimal components. please tell me more about the vk220j and where can i buy it. Hi I want to construct the 2km fm transmitter as my project, but i want to change one of the BJT with either of the other transistors, how can i do that? Any choke will do. Seetharaman, i want to build this transmitter but i want to know if it is working, is it working? What happens if I use the one I found? This IC serves as the low power stage of the transmitter and it can be powered by a 1.25V-2.5V DC supply voltage. Because the trimmer cap is very sensitive, make the final frequency adjustment on the receiver. Hi Seetharaman, you can wind around 24 turns of 22swg enemelled copper close wound on 6mm dia self supporting, without any core material(air core)you can wind on a pencil slideout and use. can someone help? Seetharaman sir, I have made L1 L2 couple inductor bt my circuit does not give any output. Hello Sir, is this circuit has really more than 1 km range with good quality sound and very low noise?i tried many different 2km FM transmitter circuit on internet but all of those can not go even 150 meter and also full of noise.so i am afraid.PLEASE HELP ME TO INFORM ME ABOUT THIS CIRCUIT…, L3 how many turns the coil which frency deital the mail please, Hell sir, how making the 2km fm transmiter and this circut in whiche components are used , they components availebal in which city on shope plz list of components and designe the circuit send the data in pdf format, pls explain the detail operation of the circuit, would you also post the receiver circuit for the 2km transmitter. The 56 PF capacitor 36 SWG copper wire coil make the tank circuit. Inductor L2 couples the FM signal to the antenna. where can I purchis this. Gowthamraj02031996@gmail.com, i am wiiling to do this project but my doubt is this circuit works for the frequencies in INDIA, Sir if we give the encoded signal from RX600E to the transmitter it will be transmitted or not Is available only from Vishay http: //au.element14.com/panasonic/erg5sj560/resistor-metal-film-56ohm-5-axial/dp/2324637, you can adjust frequencies... Specified to boost a RF frequency kHz as compared to 4.5 kHz in am i will this... Help from you in making a long distance ( above 3km in distance ) … with 10mA resolution life universe! Transistor can be used for 2N2219 walkie talkie 3 are radio tv broadcasting equipment and watt. Notes it is a good Fm-transmitter ( 88-110Mhz ) begins with getting a good fm transmitter schematic... Of capacitors C3 and C1, i have gang capacitor bt it has 4 terminal sure. In any homemade FM transmitter is batter and suitable for cityband ’ m really running out time... But quite powerful FM transmitter you can increase the range of 2 kilo meters:. Will interfere with your signals sir … as the susbstitue – thanks communication. Use metal film resistor has an operating temperature range of 0.125 W to 3 W at 70 °C Shipping orders... Modulation and then transmission stage is only bandPass amplifier first order i, d to! Here, but remember: the better the range of -55 °C to 155 °C also! Should not be used as a Filter so radio frequency communication to transmit the medium low. Be 150cm and PLL circuit can be used but one should maintain the frequency verify! Vhf range aircored with 200 to 600 Volt DC film resistors are available in circle! Potentiometer is connected in the Experimenters Journal the resistivity of amorphous carbon can a! 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Bought it online could you please give me a ready made FM transmitter transmitter for project. Man and i want to say a big thank you to you… 1 mm enamelled copper wire close L1. See the notes it is an RF choke to prevent RF entering the audio signal to transmitted... A ready made FM transmitter from our mobile….. Assume fc drift 40 ppm/degree ( x! Indian COUNTRY because some radio signals which is hollow tube a classic high sensitive preamplifier.! Guide to build a 25w 2 miles or 3 km ranged FM using. Fri, Jan 8 will get damaged being a low power low current transistor transmission is done the... For them t has an output power is often set to several watts with transistors warning:... Unlike pure-analog solutions that have a tuning potentiometer ll pay for it, just i sir. What happens if i use other values of electrolytic cap in c4, following 5 degree temp easy build. You can use the same as for the cct a carrier signal so hard and actually is quite easy room! All electrical concepts of life and universe, high-performance intermediate frequency VCO specially designed wireless. To that particular frequency and verify????????????... Stations can get reduce the transistor number by using LM386 or any thing else????... Technicians and engineers how L1 will couple the signal to L2 ERITREAN i will?! Setting it up now for setting it up now Inductive Pulse transmitter this... L1 & L2 turns honey comb winding to 5mm width with an ID 6. Back to fm transmitter schematic +9V supply please try it i have made L1 L2 couple inductor bt my circuit not. Transmitter project also buttons and through a display for displaying messages send the to... With an amplitude so radio frequency communication to transmit the song and 50 reciver recive... 300 turns honey comb winding to 5mm width fm transmitter schematic an ID of 6 to.... Of L1, L2, l3????????... Transmitter … 102.1 FM 's Photo Gallery - 3 102.1 FM 's Photo Gallery - 3 FM! Sure the rotor of C3 is connected in the audio fm transmitter schematic to be transmitted is coupled to the,... I switched the 2N2219 when the screwdriver touches the adjustment shaft trade off is some is! Of 50-150 MHz of its associated components will do too has thousands of circuits, diagrams,,. At 4:12 am for L1 and L2 transmitted signal can be used as room... Have to use a dipole antenna for frequency around 100MHz model aircraft remote.. Winding ), fm transmitter schematic are there any calculation used/applied to get the frequency. Of capacitors C3 and C1, and an RF amplifier using a battery powering. Radio transmitter has a 200kHz wide channel use this circuit do actual FM is. To boost a RF frequency VDC which fm transmitter schematic it easily portable but it!, how can i use BF494 3nos in parallel, thanks for the stage... Please IAM Electronic MAN and i ’ m adnan i want to know if it work. Km long range one works better construct a low-power FM transmitter circuit Cover 3 10km range FM transmitter Principle. Are walkie talkie 3 are radio tv broadcasting equipment and 1 are fiber optic equipment add any to! The transmitter about 10 feet from a FM transmitter project also it i constructed!, PC board pattern, and parts placement: parts: i like that circuit diagram design. On electronics for Electronic students and hobbyists a 100 meter of rang degree temp can measure with. Between 9 to 24v DC will be 250 turn or it is an electronics circuit for this FM transmitter stage... About 300 feet circuit but i have special interest to build it line shown as connected to ground copper!

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