Many Electronic circuit projects in simple ways of learning

FM wireless transmitter circuit

This the fm wireless transmitter circuit, the truth is one kind microphone that developed to be used without a cable from the microphone to the amplifier. Makes flexible to use than a plain microphone much Because without cumbersome cables. And also save a microphone cable as much Because microphone cable is high quality that has relatively high prices.

How it work

When we speak, the microphone will receive the audio signal is mixed with range FM frequency to transmit the broadcast spectrum. The audio input is just bring to the FM radio receiver tuned provide the radio only. The detailed procedures are as follows.

In Figure this circuit has very little equipment, MIC is used in the circuit be special that called the condenser microphone, inside the MIC has an one amplifier section Serves to amplify the voice that speaks to the strength increases and send to the output. So this MIC must a current one to them. Please note the circuit is supplied to the resistor 27K positive in the leg microphone,and it is way out of with the audio signal,through the coupling capacitor to pin B of Q1,

FM wireless transmitter circuit

Which Q1 also acts as both the radio frequency generator and the audio mixer on the Radio frequency is generated. and at B pin of the Q1 have the resistor R2 – 27K with R3 – 4.7K are divider circuit, Divided a number of voltage to the bias for Q1. and the capacitor C2-0.01uF is connected to ground for bypass the high frequency, At C pin of the Q1 is connected pass the coil to the positive voltage

For this coil, we use copper wire No. 19-20 AWG, wrapped around the air core diameter of 7 mm. You should be bind seven around , similar to coil spring, Then, stretching out to Length of 15 mm. close this coil has a capacitor C4 value 5-20pF is the capacitor to adjust from 5pf to 20pF we called that the timmer. It is connected to a frequency tuning

And pin C of Q1 is connected to the antenna. Which in this circuit, we use an antenna that is built with yourself. By using number of wire 16-20 AWG, about 7 inches in length, and curled into a circle like a spring, about 6 mm in diameter, the length of the wire coil to the the end, then take one end soldered to the antenna connection.

Creating and use
You should be include before small device. The condenser MIC should be use the shielded cables in length about 5 cm to connect from the PCB. We use the coated copper wire for to prevent rust green from moisture in the air. At the end of the wire must be soldered, the need for razor blade to scrape out a solution. so is soldered on. The use of lead solder, lead to a better mix of 60/40, and requires some skill in soldering. Otherwise, the spectrum could not be removed. It is a high frequency.

Figure 2 The PCB layout and Components layout of FM wireless transmitter circuit

When completed, the FM radio is one, open to the FM radio dial in the middle. When turn on the FM wireless transmitter circuit then use a screwdriver plastic or plastic sheet flat spin adjust the trimmer And speak into the microphone, to tune until has the sound to the FM radio. if tune the trimmer until full cycles, Not yet match wave, try stretching or shrinking of the coil, then adjust the new one, maybe try some stretching or shrinking the antenna, in order to deliver the best results. If all the fine tuning do still does not work. Also, try turning the radio waves, may be rotated to the minimum frequency, maximum frequency, or turn around the station. Then try adjust it again. When adjust until available, they may be find a plastic boxes or aluminum boxes or a box ready to build up own. By folding a sheet of aluminum or a plastic sheet is glued to the box for convenience to you.

Note: Principle, this circuit send far about 100 meters, Depending on the location. There is low or high of noise oscillator, Equipment with high quality or not, The soldering is good or not, Therefore, it is difficult to determine how far? But from my experience, in the center of the floor to the fourth floor of the building, it has been, they think that’s enough for the circuit with very little equipment, and low cost of this.


If you are interested in this circuit.
But fear that it will not work. You can see the details of…

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This Post Has 23 Comments

  1. 是否有可能,这是自动转换从英文翻译成中文吗?

  2. What did Larry Say,,,,????


  4. Is it possible to build a circuit which will have inputs from the tv or an ipod and then transmit to the receiver

  5. Is it possible, it is automatically converted from English into persian?

  6. can i plug in an audio source instead of using the mic and what part should i remove ? thnx

  7. how do i compute the freq. guys?

    thanks in adv.

  8. I want a radio transmitter which can transmit long range area of 30km by 30km so how can i get it ?

  9. @sean junior chirwa.. you can have it by ordering.. chinese fm transmitter on ebay ex. CZH model

  10. to play mp3 , you can remove the microphone and feed the output of a mp3 player through a 10uF electrolyte capacitor.

  11. can we have the list of the components needed to make the circuit diagram above, the wireless fm transmitter? thankyou. have a good day!

  12. so how many turns on L2?

  13. Hi alex,
    Please more in detail:
    we use copper wire No. 19-20 AWG, wrapped around the air core diameter of 7 mm. You should be bind seven around , similar to coil spring, Then, stretching out to Length of 15 mm.

  14. electronics miniproject circuit

  15. hey can you tell me what is the purpose of C3 in this whole circuit at [email protected] regards

  16. hie, l just built the circuit and connected the dc source but its refusing to pick up signals, how best can l troubleshoot the problem?

  17. which type of antenna is use here??

  18. Sir I want mini project in which am,fm modulation, transmiter and reciver is used

  19. Hi brother i want to you help me. I need a circuit can talk together . Such as police radio.

  20. Hi
    I don’t know much about electronic circuits and I would love to try, how can i tell the vaultage of the capacitors used?
    If am to go buy the components from a radio shack?

    1. Hi, Dee dave,
      Thanks for your feedback.
      Also, I do not know a lot of Electronics.
      Every day, time is running so fast I need to take care of my children.
      When I have free time I will learn electronics with make circuit and share it.

      It is good ideas to learn capacitor. It is useful basic.

      You should learn first, then you can know to buy. Because sometimes you can save with buy a few components for make a lot of projects. For example, You can use 1N4007 (1000V,1A) instead of many silicon diodes, 1N4001,1N4002 etc. They are the same prices. I hope you can understand my English is poor. Of course, I will try to improve it.

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