I advise you follow and understand the circuit schematic diagram carefully.įM Transmitter Projects for your school/college needs:-Īn FM transmitter is always an interesting project to do while you are in school or even at college □ You can “wow” your peers with your magician like circuit designing capabilities. Author has described its assembling carefully and you can find many things to take special care of while assembling the circuit. Though it seems small in the number of components and easy to understand, you have to be careful while designing and making this circuit. The basic working is the same – it’s a two stage transmitter. Long Range FM Transmitter – This is one of the low-cost circuits you can make to build a long-range transmitter. The precise PLL circuitry of the IC ensures no frequency drift. Starting from 88.7Mhz, there are 14 possible transmission frequencies incrementing in steps of 0.2Mhz and can be selected using a dip switch in the circuitry. The IC has separate audio processing sections for the left and right channels, pre-emphasis circuit for improving the signal to noise ratio, crystal control circuitry for accurate frequency locking, a multiplex circuit for making sum etc. This circuit is made using IC BH1417 (which is a PLL stereo transmitter IC from Rohm semiconductors). Stereo FM Transmitter using PLL – This is one of the high-quality FM transmitters available in this list and obviously it comes with a complex circuitry. This FM modulator can be operated between 76 to 108Mhz. Stereo FM Transmitter using BA1404 IC– This is a stereo FM transmitter circuit using an IC from Rohmm semiconductors named BA1404 – which is a monolithic IC and has a built-in stereo modulator, FM modulator, RF amplifier circuitries. You only need to worry about giving input and the tank circuit for creating oscillations. The use of IC makes possible easy wiring and assembling of the circuit. IC based FM Transmitter – Instead of two transistor stage transmitter as we saw above, here we use an IC – UPC1651 (wideband UHF MMIC amplifier). Both questions are answered in the comments section by Seetharaman and John Many of the readers have posted comments in this circuit asking how to calculate the frequency of the output wave and how to make an inductor for the tank circuit. The basic functioning of the circuit is same as the above one, two stages served by two transistors – first stage as preamplifier and second stage as oscillator and modulator. Carefully observe the schematic diagram before you build this circuit.Ģ00 Meter Transmitter – This one is yet another simple FM transmitter but more stable than the one listed above. The second stage is the modulation stage in which amplified audio signal is modulated (superimposed to a carrier waver) for transmission. The first stage is the preamplifier stage where an audio input signal is amplified before modulation. It has two stages served by two transistors Q1 and Q2. Simple Two Stage FM Transmitter – This is one of the most simple FM transmitter circuits you can try out on your breadboard. Making an FM transmitter is one of the best electronic projects that newbies can try. Usually, personal FM transmitters are plugged into the audio device, let’s say an MP3 player and then the frequency for the broadcasting is selected. For first time readers- What is an FM transmitterĪn FM transmitter is basically a small gadget that can broadcast audio from a source on a selected frequency. Today I thought of listing all of them here as a single web page, so anyone can easily navigate through all the radio transmitter circuits and its schematic diagrams. Over years we have developed a number of FM transmitter circuits with various aspects.
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