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Simple and Budget DIY - How to Make An FM Transmitter?

Date:2021/3/30 9:49:21 Hits:

Are you reluctant to buy FM radio broadcast transmitters because of the high price and not familiar with the working principle? Why not DIY a simple and practical FM radio broadcast transmitter or FM transmitter first? This tutorial will give you a detailed introduction on how to make and assemble an working FM broadcast transmitter, whether you are amateur or veteran, with only a few minutes reading and a little material cost, you could learn how to make and assemble a simple and practical FM radio broadcast transmitter. Additionally, this tutorial can not only improves your hands-on ability but also saves you expensive equipment purchase and maintenance costs. Get ready on it!

Anyone can buy an FM antenna and start their own radio station. All one needs is the right equipment and, of course an FCC license, which is not to terribly difficult to obtain. If you have ever dreamed of owning your own radio station, it is as easy as finding an FM broadcast equipment distributor that specializes in antenna sales for radio broadcasting. FMUSER can make your dream come true. We specialize in radio broadcasting equipment, and we even help our customers obtain their FCC license if needed. We can even help you build your radio station. We have the lowest prices on all of the equipment you need for your radio broadcast. Contact FMUSER today!

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If you're looking for how to make an long-ranged FM transmitter antenna, please kindly visit this tutorial:

How to DIY your FM Radio Antenna|Homemade FM Antenna Basics&Tutorials


1. Things You Should Know before Getting Started
2. Creating a simple FM radio broadcast transmitter 
3. How to Make A 5KM Long-Ranged FM Transmitter?
4. How to Make A Low Powered FM Transmitter?
5. How to Make A Very Simple FM transmitter?
6. How to make A Simple IPOD FM Transmitter?

Best Budget Low-power FM Radio Broadcast Trasnsmitter in 2021

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1. Things you should know before getting started

What is Frequency Modulation(FM)?

Frequency modulation is a technique or a process of encoding information on a particular signal (analogue or digital) by varying the carrier wave frequency in accordance with the frequency of the modulating signal. As we know, a modulating signal is nothing but information or message that has to be transmitted after being converted into an electronic signal...>>More

Also read: What is the Difference between AM and FM?

How Does an FM Transmitter Work?

FM radio broadcast transmitter is one of the most important equipment required in radio broadcasting. Its function is to obtain sound and broadcast the sound to various receivers in a certain area through an antenna (the coverage of the broadcasting area is affected by many factors, Such as the installation position of the transmitting antenna, the weather or the power of the FM radio broadcast transmitter, etc.)

The process of transmitting sound information (radio broadcasting) seems simple, but in fact it is the result of the coordination of different components in the FM radio broadcast transmitter

The following are typical FM radio broadcast transmitter working components and their working principles:

Sample Graph
The Power Supply

Providing an electrical signal to operate the transmitter.
The Oscillator

Creating the alternating current, a carrier wave, that the transmitter sends through the antenna.
The Modulator

Adding information to the carrier wave. In the case of FM (frequency modulation), the modulator either slightly increases or decreases the frequency of the carrier wave.

Increasing the power of of the wave. More powerful amplifiers allow for a larger broadcast area.
The Antenna

Converting the amplified signal to radio waves.

How Does an FM Antenna Work?

People often call antennas aerial. For FM radio stations, antennas generally refer to FM radio broadcast antennas. There are two types of such antennas. They are installed on the transmitting end (corresponding to FM radio broadcast transmitter) and the receiving end ( FM radio receiver) Although they are installed in different geographical locations, they are similar in terms of their working principles.

Also read: How to DIY your FM Radio Antenna|Homemade FM Antenna Basics&Tutorials

Both the antenna at the transmitting end and the antenna at the receiving end act on radio waves. The main function of the antenna at the transmitting end is to receive and transmit the electrical signals generated by the FM radio broadcast transmitter and transmit them, while the receiving end antenna is responsible for receiving these radio waves. wave. It is worth mentioning that these radio waves can travel a considerable distance (even can be transmitted to outer space). Therefore, if you want to receive these radio waves transmitted over a long distance, the receiver must be very powerful, otherwise it is easy Cause various problems, such as noise interference problems.

In practical applications, the broadcast information (such as various songs, commercials, etc.) that we receive through various devices, such as radios, is actually the radio wave signal sent by the broadcast station on the transmitting end.

After the broadcasting station records the information that needs to be broadcast through a certain device (this equipment is usually a microphone), the FM radio broadcast transmitter will convert the broadcast information into electrical energy, and then the electrical energy of the broadcast information will continue to surge through the FM antenna, and the Increase the signal strength or increase the power during the surge. During this period, the electrons in the electric current that surge back and forth across the length of the antenna to create electromagnetic radiation (radio waves), and will transmit data at the speed of light, and then These radio waves will be captured by the antennas of other receivers and converted, and finally the radio wave signals are converted from electric current into sound and data to be received by the listener.

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2. Creating a simple FM radio broadcast transmitter

FMUSER explained in detail the definition of FM, the working principle of FM radio transmitter and FM receiver in the first part. In this part, FMUSER will provide several methods for making simple FM transmitters for your reference.

Make your own FM transmitter

To create a simple radio transmitter, what you want to do is create a rapidly changing electric current in a wire. You can do that by rapidly connecting and disconnecting a battery, like this:

When you connect the battery, the voltage in the wire is 1.5 volts, and when you disconnect it, the voltage is zero volts. 

By connecting and disconnecting a battery quickly, you create a square wave that fluctuates between 0 and 1.5 volts.

A better way is to create a continuously varying electric current in a wire. The simplest (and smoothest) form of a continuously varying wave is a sine wave like the one shown below:

* A sine wave fluctuates smoothly between, for example, 10 volts and -10 volts.

By creating a sine wave and running it through a wire, you create a simple radio transmitter. It is extremely easy to create a sine wave with just a few electronic components -- a capacitor and an inductor can create the sine wave, and a couple of transistors can amplify the wave into a powerful signal. By sending that signal to an antenna, you can transmit the sine wave into space.

Also read: Top 9 Best FM Radio Broadcast Transmitter Wholesalers, Suppliers, Manufacturers from China/USA/Europe in 2021

Information transfer

If you have a sine wave and a transmitter that is transmitting the sine wave into space with an antenna, you have a radio station. The only problem is that the sine wave doesn't contain any information. You need to modulate the wave in some way to encode information on it. There are three common ways to modulate a sine wave:

Pulse Modulation - In PM, you simply turn the sine wave on and off. This is an easy way to send Morse code. PM is not that common, but one good example of it is the radio system that sends signals to radio-controlled clocks in the United States. One PM transmitter is able to cover the entire United States!

Amplitude Modulation - Both AM radio stations and the picture part of a TV signal use amplitude modulation to encode information. In amplitude modulation, the amplitude of the sine wave (its peak-to-peak voltage) changes. So, for example, the sine wave produced by a person's voice is overlaid onto the transmitter's sine wave to vary its amplitude.

Frequency Modulation - FM radio stations and hundreds of other wireless technologies (including the sound portion of a TV signal, cordless phones, cell phones, etc.) use frequency modulation. The advantage to FM is that it is largely immune to static. In FM, the transmitter's sine wave frequency changes very slightly based on the information signal.

Once you modulate a sine wave with information, you can transmit the information!

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3. How to Make A 5KM Long-Ranged FM Transmitter?

Here we are presenting a long range FM transmitter that can cover a reasonable distance of 5 kilometers / 3 miles and beyond with a one watt RF power with full circuit details, bill of material and testing procedure. With 12 volt DC it will deliver 1 watt RF power. With Yagi antenna, looking like early days of TV antenna with aluminum pipes at both at transmitter and receiver end looking each other at line of sight distance, the range can be up to 5 km / 3 miles.

This FM transmitter has 3 RF stages. 

A (VFO) Variable frequency Oscillator (30 mw) , 

A class C driver stage (150 mw) as buffer and 
A class C final RF power amplifier (1 Watt ) 

Basically every FM Transmitter has to have a Voltage Controlled Oscillator (VCO) . This is a high frequency oscillator whose output frequency changes based on the voltage applied at a particular control point. This is a variable frequency oscillator (VFO).Q1 with is associated components form the VFO. The VFO output is fed to Q2. Q2 being a buffer does not load the VFO but amplifies the power only. This output is fed to the final RF power amplifier Q3, the output of which feeds the tuned circuit. Several capacitors C 4,8,9,10 are used on the supply rail for HF filtrations .If one feeds the VFO transistor Q1 directly with a microphone at its base it becomes a FM Transmitter circuit. 

The Q2 pack has to be "TO 92-B" type(slightly bigger than BC547 pack) and not simple TO 92 which is slightly smaller in size ( same like BC547 pack). Moreover please note that the pin configurations are different for these 2 types. In case TO92 pack is used then increase the value of R7 to 56 ohms 1/2 watt failing which it shall burn. But this TO92 pack may affect the range 

Q3 has to be 2N3866 with a heat sink for proper range. However 2N 2219 can be used that will but compromise the range drastically 

Also read: What is Low Pass Filter and how to build a Low Pass Filter?


Initially use a simple 75CM single wire standing straight as antenna for getting a range of about 100-200 meters indoor. Similar length telescopic antenna is also OK for testing which will give only about 100-200 meters range . But never go longer than 79 CM antenna wire thinking that it will cover higher range. In fact if you do so the range will fall. 

Frequency of the transmitter can be set with in 88 to 108 MHz FM band by adjusting the TR1 (Trimmer 1) of the VFO or by changing the spacing between the Coil L1. 

Frequency Adjustment: 

NOTE:Don't try to test the unit in evening to night because at that time many powerful FM stations will be active. Test it only at day time. A few people have had trouble with this circuit if not soldered properly. The biggest problem is not knowing if it is even oscillating, since the frequency is outside the range of most simple oscilloscopes. One may require the use of an RF frequency counter which is very expensive. So, to know that it oscillates, and just have to find out at what frequency , the simplest way is to put a cell phone having FM radio ( or any FM radio) in search mode near your transmitter to hear some sound while you tap the microphone. Please note very near the transmitter will have several frequencies responding to the microphone and one will get confused. So go ,at least 30 meters away from the transmitter after initial test as above is verified. There the display gives only one frequency to which it gets best clear sound and all other frequencies giving hissing sound and that is the frequency the transmitter is operating. Adjust the trimmer TR1a very very very (about 1 degree) little clockwise or anticlockwise ,the transmission frequency will change .Then put the cell phone to search again and find the frequency. If it is very near a powerful transmitter you will not get the range. Change the frequency again to go towards 106 MHz where no commercial transmission usually takes place. 

The distance adjustment, after connecting a Yagi or GP antenna:

Transmission range is adjusted by TR2. For that use a multi meter in 250 mA DC current mode in series with the 12 volt supply and then adjust the trimmer TR2 while the current is maximum. Adjust the current to around 75 mA (at 12 Volt DC supplied by a good adaptor) or the peak current by trimmer 2 to say about 85 mA. From the peak while you turn clockwise current will fall or while you turn anti clockwise it will also fall. And that is the best position of TR2 for full power delivery to the antenna. Please note Q3, round metal body must be fully covered by the black heatsink supplied, without which it will get badly heated up and finally get burnt. In around 100mA at 12 volt it shall cover a good range and shall be warm but beyond that current though it may cover a longer range it shall get very badly heated up ,and is likely to fail.Initially try to touch the heatsink and feel the heat as warm only. If it gets heated up badly switch off and reduce the current. 

Important Note: 

(Don't use a metallic screw driver .You have to use a small piece non iron metallic object to work as a screwdriver - this will not alter the frequency while you take your hand near or away from the trimmer that usually happens in a metallic one).Copper or aluminum screw driver with insulated top is preferred. 

For Long Range use a Yagi antenna 

The output is fed to a coaxial cable (generally used for cable TV ) which is nearly matched to the Yagi antenna (though 300 Ohms) impedance of 75 ohms by trimmer TR 2 of the tuned circuit for maximum power delivery to the load ie the Yagi / GP antenna. Transmitter should never be powered without the antenna (ie the load) in which case the total power forms a SWR standing wave ratio on the power transistor Q3 heating it up badly to result in failure. 

Also read: What is VSWR and how to measure VSWR?


1. It is advisable to engage any electronics technician for soldering if one has no prior professional experience in soldering and component identifying. Any excess heating more than 2 seconds may damage the component. Use only 25 watt soldering iron. Placing right value of resistor is most important. Read the colors carefully to ascertain its value. If a multimeter is available , then better measure it in ohms / Kohms range. It may not give exact value. Plus or minus 10% is acceptable. Reading disk ceramic capacitors need expertise. Place them correctly. Please refer the image. 

2. Some components might have accumulated dirt on their legs by oxidation due to storage. Must clean them thoroughly to remove the dirt with a knife all around before soldering. The metal transistor as an example as seen in the packet. Better clean all the component legs even if they have no dirt on them. 

3. If the trimmer pins are not going inside the holes try to slightly make the holes on the PCB bigger by some sharp pointed pin. 

4. Mount the black heat sink on the metal transistor before mounting on the PCB. 

5. Solder cut pcs of resistor legs to the microphone and solder them on to the PCB by proper polarity. The body is -ve. 

6. Maintain the legs of transistors at least 5mm above the PCB and all resistor legs & coils on sleeping position as close to the PCB. Capacitors as usual standing but solder the legs as short as possible to the board. 

7. The coils are super enameled coated. Don't be under the impression that they are copper. Must clean their ends only thoroughly to remove the enamel with a knife before soldering. 

8. Must take a tapping from coil no 1, after 1 turn by scratching with a knife the enamel at a point and then use any cut piece copper wire of resistor (not iron wire) to solder there and connect the wire end to the hole on the PCB . 

9. L3 and L4 must be at 90 degrees to each other. 

10. Cleaning the dirt and rust on the legs as explained are very very important. All technicians know it. A beginner must understand this. Otherwise those components will never catch solder. 

11. May use 9 volt battery by soldering the red to +ve and black to -ve. For using on 12 volt the DC socket has 3 pins. The center pin is 12v + and other 2 pins are for 12 volt -ve. Connect the same accordingly with small pcs of wire. Red + ,Black -ve to the DC socket.

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4. How to Make A Low Powered FM Transmitter?

Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.

PC Board Layout and Parts Placement
Total Qty
0.001uf Disc Capacitor

5.6pf Disc Capacitor

10uf Electrolytic Capacitor 

C5 1 3-18pf Adjustable Cap 

270 Ohm 1/8W Resistor
270 Ohm 1/4W Resistor
R2,R5,R6 3
4.7k 1/8W Resistor
4.7K 1/4W Resistor
10k 1/8W Resistor
10K 1/4W Resistor
100k 1/8W Resistor
100K 1/4W Resistor
Q1, Q2
2N2222A NPN Transistor 2N3904, NTE123A
L1, L2
5 Turn Air Core Coil 
Electret Microphone 
9V Battery Snap, PC Board, Wire For Antenna 

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5. How to Make A Very Simple FM transmitter?

This sample test shows you how to build a very simple FM transmitter from thirteen components, a Printed Circuit Board (PCB) and a 9v battery. This project was designed to be mounted on a PCB, however you don’t have to. You could construct the project on Vero board (strip board) or any other 0.1” pitch style of project board. If you just want to experiment with this circuit, you don’t even need a board; you can just solder the component s together and let the completed project just rest on the work top. No matter which style you choose, try to keep all component leads nice and short. You could also make the PCB much smaller than the one shown here which is approx. 3 cm square. This is a good size to keep the unit small but nicer to work on for beginners. If you wanted to make one really small, you could use all SMT parts.

Also read: How to Eliminate Noise on AM and FM Receiver?

Selecting the operating frequency range

The value of capacitor C5 controls the transmission frequency range.

In the UK, domestic FM radio receivers cover from around 88 - 108MHz.

The following table shows an approximate frequency range that can be expected for different values of C5.

These are only approximate as frequency is determined by the L1 and the specification of the transistors, but these ranges were observed in the prototype unit. Also note that the closer the coil windings are, the lower the frequency will be. Just slightly compressing the coil dropped the transmission frequency by over 1 MHz.

C5 Value Lower Freq. Upper Freq.
5pf 130MHz 180MHz
10pf 115MHz 152MHz
22pf 106MHz 124MHz
47pf 89MHz 97MHz
100pf 73MHz 75MHz

Note:Different makes of capacitors will give different frequencies.

I personally picked a frequency that was outside of domestic FM receives so that I wouldn't bother anybody; and nobody else can "tune-in" by accident. However, if you don't have a communications receiver then you will have to pick a frequency range that you can receive with your FM radio equipment.

Winding the coil

The first think to do is wind and mount the coil. The coil is simply a length of 0.6mm / 22swg copper wire wound into a coil. Take a 10cm length of bare copper wire and wind it around a suitable former; the blade of a jewellers screwdriver or knitting needle is ideal.

You will need between 4 to 6 turns and you may have to experiment here. 6 turns gave my prototype a transmission frequency of around 120MHz. A coil with fewer turns should reduce the frequency.

Mounting the coil on the board

Once the coil has been wound, leave it on the winding former for now so that it doesn’t get deformed whilst your mounting it. Pop each end of the coil into the correct PCB hole stretching the coil as needed so that its windings are evenly spaced. Turn over the PCB and solder in both ends of the coil.

The above three images show how the coil centre-tap wire is made and then fixed to the coil.
Solder the centre-tap wire to the approximate centre position of the coil. When it’s secure, turn over the PCB and solder the wire to the track and trim off the excess wire.

Solder the remaining components

Next mount the remaining components except the transistors, in any order that you feel most comfortable with.

Lastly, you need to mount the transistors Q1 & Q2, and you need to be VERY carful that you insert them the correct way. Depending on which transistors you use, you may have to bend some of the legs around each other. If you need to do this, make sure that they don’t touch each other.

Now solder in the wires from the 9 volt battery clip making sure you get the positive and negative the correct way around.

Connecting the microphone

When it comes time to solder on the microphone you need to be carfull. On the base of the mic there will be two solder pads. If you look closely, one of the pads should be connected to the case; this is the Negative.

If you connect the mic the wrong way around it won't work and you will probably damage it.

Notice above C1 in figure 6, there is a small link wire - LNK.
This allows power to be applied to the microphone via R1. If you decide to not use this type of mic or to connect the transmitter to another audio source, you should remove this link.

Completed FM transmitter

You don’t need anything clever in the way of aerials for this transmitter. The longer the aerial wire is, the further the transmission range will be but for testing, just connect a 25cm length.

Make sure that the other end of the aerial doesn’t come into contact with anything; that includes any part of the circuit or anything that may be earthed.

When you’re done, you should end up with something that looks like the picture on the left.

First tests FM receiver showing 119.9 MHz

Ok, now for the tricky bit. Assuming you’ve connected everything together correctly, then depending on the transistors used, tolerance of the components, characteristics of your coil and position of the trimmer capacitor, when you connect the battery you will be transmitting audio somewhere on the FM band, probably between 80MHz and 150MHz.

Place your FM transmitter near an FM radio and SLOWLY start to tune from one end of the band to the other. As you tune the radio with one hand, keep gently tapping the microphone on the transmitter with the other hand. At some point you should hopefully start to hear the tapping. When tuning you need to experiment to find the exact frequency. When you find the frequency, make a note of it and keep going a bit further. Sometimes you can find a stronger signal a little further down the dial.

Those using a communications receiver or scanner should select WFM or Wide FM if available.

Changing the transmission frequency

Crushed coil to lower the frequency

With the component values specified, both my trial units popped up at around the same frequency.

I then “crushed” the coil slightly; almost certainly one or more of the turns are now shorting together (see fig.10) and this immediatly lowered the transmission frequency.

Frequency has dropped to around 110.9 MHz
When tuning the transmitter don't touch any part of the circuit as you will cause the output frequency to drift around.

Now the microphone used has a built in audio amplifier (see Figure 7) and I kid you not, it can hear an ant blowing its nose at 50 meters. If you just speak softly close up into the microphone it will probably sound distorted because you will over load the input.

The PCB was designed using DipTrace PCB software and there is a free version of this product available for download that can be used to modify / print the foil. You will find the original PCB foil for download at the end of this article.
One question this is often asked is "what's the transmission range?".

The problem with attempting to answer this question is that it depends on so many external factors including, number and density of obstacles between the transmitter and receiver, sensitivity of the receiver, the quantity and strength of other transmissions on or around the chosen wavelength that can overload the receiver, and the size of transmitting and receiving aerials. As a rough guide, assuming that a clear part of the frequency spectrum can be located and a nice long aerial is connected to the receiver, I've had around 250 meters in the city or built up area with a one Meter wire aerial on the transmitter, but a fair bit more distance out in the open of it it's used up high.

Reducing the value of R4 will increase the drive to Q2 thus increasing the transmitter power output. However, if you reduce R4 too much you will shorten the life of the battery and may eventually destroy transistor Q2.

Components Decription Comments
R1 2.2K 5%

R2 1.2K 5%
R3 100K 5%
R4 560 ohms 5%
C1 1UF
C2 22PF
C3 4.7NF
C4 20PF Varcap
C5 5.6PF See text on picking a suitable value
Q1 Gen NPN Or just about any small NPN transistor
Q2 Gen. NPN Or just about any small NPN transistor
MC1 Elect. Mic
L1 See Text
A1 See Text
BT1 9V Battery clip

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Also read: What is QAM: quadrature amplitude modulation

6. How to make A Simple IPOD FM Transmitter?

Things used in this project

Hardware components

1. TI SN74LS138N - 4 Input NAND gate Schmitt Trigger

2. LM386 –Audio Amplifier
3. LM7805
4. Speaker-For testing puposes!
5. Capacitors

The following circuit diagram shows the FM transmitter circuit and the required electrical and electronic components for this circuit is the power supply of 9V, resistor, capacitor, trimmer capacitor, inductor, mic, transmitter, and antenna. Let us consider the microphone to understand the sound signals and inside the mic there is a presence of capacitive sensor. It produces according to the vibration to the change of air pressure and the AC signal.

In our circuit, the Audio Signal is given by a phone or IPod instead of a microphone. The Pre-Amplification is done using the LM386 Audio Amplifier IC. The 74LS138 along with 22pf capacitor acts as a Tank circuit which produces a strong carrier frequency and modulate it with our amplified audio signal like the 0.1 uH inductor. We do not have a RF-Amplifier in our circuit, but it can be added if you need to achieve a higher range.

it can be built on a breadboard or soldered to a Perf board. The complete circuit can be powered using a 9 V Battery. If you are using an adaptor to power it make sure you add filter capacitor to reduce the noise from switching. The circuit uses an LM386 Audio amplifier which acts as an Pre-Amplifier, this IC amplified the audio signals from the audio device and feeds it to the Oscillating circuit.

The Oscillating circuit should have an Inductor and a Capacitor. In our project the IC 74LS13 which is a 4-Input NAND gate Schmitt Trigger is designed to oscillate at 3rd order Harmonics which is around 100 MHz. A filter capacitor across the power rails of the IC is very important to make it working.

The 3.5 mm Audio Jack has three terminals in which are for channel L, channel R and Ground. We short the channel pins so that it becomes mono channel as shown in picture below and connect it to pin 3 and ground is connected to pin 2 of LM386.

Tuning into right frequency

Thanks to the approach given by Tony Van Roon tuning this FM Transmitter circuit is very easy compared to other circuits since it does not have an Inductor or a trimmer. To start with simply power on the circuit and connect the speaker to the circuit as shown in the circuit above. Now connect the iPod or any audio device to the 3.5 mm jack and play the music. You should be able to hear your audio through the speaker. If not the problem should be with your LM386 connections. If the audio can be heard, disconnect the speaker and proceed with the tuning process.

Use a Radio with tuner and start turning your knob to know at which frequency you oscillator is broadcasting. The best way is to check around 100 MHz as it would most likely work around this frequency. Keep your volume at your maximum and tune slowly till you can hear the song that is being played through your audio source.

You Can Try the Following if You Hit A Wall

1. If you hear a strange noise at a particular frequency and want to find to if this is your oscillator frequency. Simply turn off the circuit and turn in again, your radio should produce a crackling noise if the frequency is correct

2. Extend the antenna of your radio to its full length and place it close to the circuit initially

3. Change the operating voltage within 4.5 to 5 V to change the frequency at which you are broadcasting because sometimes your frequency might have clashed with another popular FM band.

4. (Totally optional) If you have a variable capacitor of range 0-22 pf you can replace the 22 pf cap with this trimmer and try changing its values.
Once you find out at which frequency you are working you can position the antenna in the right direction and enjoy your broadcasted music. Hope you got the project working.

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