FM Transmitter

  
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This simple transmitter operates from a 9V battery as shown above. I personally built this for a purpose. This is how it happened:- `members of my singing group find it difficult to handle a FM mic in Church. The choir sings in acapella form and the congregation expect us to perform well. The old FM mic system was not a perfect solution, so I buil
FM Transmitter - schematic

t this kit and a mixer for the receivers. using three separate transmitter circuits and a mixer on the receiever, the choir voices were perfect and cleanly reproduced. " From the notes I made experimentally, C3 is vital to the circuit and without it the circuit may become unstable. C4 is in parallel with C5 and presents a moderate load impedance. Finally all transistors are NPN. The circuit works well and has proved reliable. Using the above values, the inductance of L1 can be calculated. A diameter of 5. 5mm = 0. 22 inches, the radius is half this value or 0. 11 inch, the length is 4. 5mm and number of turns, n = 6. This gives L1 a value of:



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