Here is a well designed fm transmitter circuit that works effectively in 12 km range. If used voltage level of the power supply more than 10v. After getting several comments from young electronic students, i am rewriting this article to make the fm transmitter making process more clear. It is surprisingly powerful despite its small component count and 3v operating voltage. Also get an idea about how fm radio transmitter circuit works. These are one 12v dc 1a series regulator chip, and one 8v dc 1a series regulator. I fed the 8v regulator from the output of the 12v regulator. The circuit diagram was pretty wide and i cannot fit it into this webpage. 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. Today i have come up with fm transmitter circuit which has a range of about 3 km approximately. How to make fm transmitter circuit cover 310 km range.
However, the proposed 1 watt fm transmitter circuit is made up of four radio. The 80 watt power amplifier this is a pretty conventional design, using bipolar transistors in a tuned class c circuit. Download fm transmitter 10 km pdf book fm transmitter 10 km click here to access this book. As figure 1 sonar with up to 2 watts, when used with a supply voltage of about long range fm transmitter circuit,2 km 88108 mhz vhf see more. This project provides the schematic and the parts list needed to construct a 3v fm transmitter. A very good 1 watt fm transmitter circuit, very easy to build circuit. Long range transmitter circuit 2 to 5 km range homemade.
The output of the oscillator is about 50 milliwatts. Fm transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. Transmitter coil is 5 turns of enameled 22 awg wire, with diameter of 1 cm without nucleus. They have it set at about 282, and according to the users it covers 8 km radius. The circuit is simple and really quite crude, but it does include mono sound. Here audio signals are frequency modulated and video signals are pal modulated.
Ibm42m10lcyaa20 ibm42m10scyaa10 100m6sli circuit diagram for simple fm receiver 160mhz text. Oct 12, 2017 this is a simple wireless fm transmitter circuit which uses rf. This is long range fm transmitter circuit in vhf range. It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter.
Thanks to the use of two stages, the amplifier can be driven to full power with less than 1 watt driving power, so that a large gain margin results in this transmitter. In the case of applications typically do not want a high transmission. Fm transmitter circuit 10 km circuit diagram images. This longrange fm radio transmitter has an additional rf power amplifier stage, after the oscillator stage. Sonar with up to 2 watts, when used with a supply voltage of about 24v. If the fm transmitter is in use voltage supply of 9 volt battery and use an antenna whose length is less than 12 inches, then this fm transmitter will be within fcc limits. Here are some diy fm transmitter circuits that we have been published on. The top countries of supplier is china, from which the percentage of 50km fm transmitter supply is 100% respectively. A wide variety of 10km fm transmitter options are available to you, there are 371 suppliers who sells 10km fm transmitter on, mainly located in asia. A great stereo fm transmitter circuit is indicated here. It is nothing but a 555 timer tone generator at the audio input. Input source is an electret condenser microphone and signal gain can be adjusted by using the potentiometer p1. We are using a fm transmiter which has according to its specs a maximum output power of 340 watts.
The modulation can be made so much with a microphone or audio source. The transmission signal can catch upto a distance of 5 km with stable frequency. A subminiature fm transmitter capable of picking up sounds at the level of a whisper and transmitting them to any standard fm receiver up to a mile away. Fm transmission is done by the process of audio pre amplification, modulation and then transmission. The post explains a 10 km long range transmitter circuit using ordinary components. With a matching antenna, the fm transmitter circuit shown here can transmit signals up to a range of 2 kilo meters. In above fm transmitter circuit, there is a large wider channel needed. This small power fm transmitter can transmit more than 1 km in good conditions. Fmusercze fm transmitters have been used all over the world for communication. Long range fm transmitter circuit,2 km 88108 mhz vhf. With the increased activity on 2 metres, some who may have contemplated working this band, have possibly been deterred by. I have not shown the two regulators in the drawing. Equipment using advanced modulation system and builtin pll frequency, audio preemphasis, limiter, and lowpass filter circuit.
Fm transmitter circuit working and its applications. Begin by building the oscillator stage, solder a tiny wire to t1 10pf capacitor out and hearing a fm radio, tweak the 10k pot until it is possible to. The circuit diagram was pretty wide and i cannot fit it into this. C3 is a 1 40 pf trimmer capacitor and l1 is 8 to 10 turns of hookup wire of 22 guage. Guide to build a 25w 2 miles or 3 km ranged fm transmitter circuit diagram schematic design.
The ic has a broad frequency response to 1200mhz and power gain up to 19db. This tutorial is for making simplest fm transmitter using one transistor. Circuit of power fm transmitter is built around 2n2218 transistor. Fm transmitter using upc1651 electronic circuits and. A high gain two stage audio amplifier section provides greater sensitivity than.
The circuit does have a large and complicated components. Czh cze15a 3w15w fm stereo pll broadcast transmitter 87. The transmitter circuit is capable to neglect the noise signal through the amplitude variation. It utilities a variable high gain audio preamplifier which can detect voices 40 feet away using an electret microphone. Smd fm transmitter circuit 1 watt 10km fm transmitter circuit electricalcorecircuits circuit spy bug fm transmitter schematic with pcb xtronic fm transmitter main output frequency electrical engineering stack. This circuit requires only one power supply 9v only. You can make this project with less components and it.
The circuit diagram of this project is some hard, but can made with patience and careful connection. Start building this high range fm transmitter and see how your output comes. This is very stable, harmonic free, long range fm transmitter circuit which can be used. With the increased activity on 2 metres, some who may have contemplated working this band, have possibly been deterred by the cost of a black box and the uncertainty of modifying commercial equipment. These modulated signals are applied for the antenna. A wide variety of 50km fm transmitter options are available to you, there are 65 suppliers who sells 50km fm transmitter on, mainly located in asia. By this homemade 5 km long range fm radio transmitter project circuit. The circuit is basically a radio frequency rf oscillator that operates around 100 mhz. The resulting pm signal as the output of the modulator is the desired fm signal. You can easily prepare the pcb by using any pcb editor and apply it to the board by using the ironing method. How to make a 2 5w fm transmitter circuit cover 3 10km range fm video transmitter and receiver circuit diagram.
The output of the transmitter is taken through trimmer vc3 to a telescopic or indoor wire antenna. As figure 1 sonar with up to 2 watts, when used with a supply voltage of about 24v. You can increase the antennas height and the range of the capacitor and make the fm transmitter circuit for upto 10 km. 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. Apr 9, 2019 2 5 km long range fm transmitter 500 km fm transmitter circuit diagram 1 watt fm transmitter 500 km fm transmitter circuit diagr. With a great matching multielement yagi antenna or 50ohm ground. When i was 8, i came across art swans fm transmitter circuit. Simple walkie talkie circuit diagram pdf short wave am transmitter short wave am. The main principle of this circuit is to transmit the audio and video signals. Turn the radio receiver to the transmitter carrier frequency and adjust the volume control of audio input device, vr1 and vc3 to get clear undistorted sound in radio receiver. The circuit is best suited for demonstration and fm transmitter circuit project. Long range fm transmitter circuit diagram and schematic at low cost using very simple.
The extra rf power amplifier used to strenght up the power output to become 200250 milliwatts. Let us consider the microphone to understand the sound signals and inside the mic there. The circuit can also be used as a remote control transmitter. A varicap diode circuit is included to change the frequency of the transmitter and to provide frequency modulation by audio signals. Free download 2 km fm transmitter electronic circuits. The circuit built around transistor t1 bf494 is a basic lowpower variable frequency vhf oscillator.
Block diagram of fm transmitter working of fm transmitter circuit. This is a longrange fm transmitter circuit in the vhf range. Many times we want to make fm transmitter which is simple to build and has a good range. This fm stereo transmitter that can be used for factories, schools, supermarkets, farms, office space or create your own radio station. The simplicity of building a fm circuit made it so popular among other modulation techniques. The power of this long range fm transmitter circuit is very good. Pls i need a diagram of fm transmitter with the highest frequency rate also a diagram of radio reciever,all with components. The circuit is in light of the ic ba1404 from rohm semiconductors.
So here is a simple fm transmitter circuit which contains only few components and also has long range. How to make fm transmitter circuit with 3 km range eee projects. This fm vhf transmitter will output approximately 250mw of rf power using a 2n3866 output transistor and can operate between 75mhz and 146mhz. Fm transmitters have been used all over the world for communication. The audio signals picked by the microphone are fed to. Here is the circuit diagram of an fm transmitter using the ic upc1651. The top countries of supplier is china, from which the percentage of 10km fm transmitter supply is 99% respectively. Download the pdf file then print it with your printers standard setting then cut the printed layout. This fm transmitter fm tx is about the simplest and most basic fm tx it is possible. Fm demodulator using pll this is a good circuit of an fm demodulator with schematic. Long range fm transmitter full circuit diagram with. With this situation in mind, the author has, designed a simple, easilybuilt 2m f. The transmitter circuit described here has an extra rf power amplifier stage using 2n3866 rf power transistor after the oscillator stage to.
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