Simple FM transmitter

Many times we want to make fm transmitter which is simple to build and has a good range. So here is a simple fm transmitter circuit which contains only few components and also has long range. C3 is a 1 - 40 pf trimmer capacitor and L1 is 8 to 10 turns of  hookup wire of 22 guage
wound on 6mm form. The size of a standard pencil is also 6mm so you can use a round pencil as form to wind the coil. The optional resistor shown in figure 2 is to limit the voice sensitivity for example a 10K resistor will resist the voice signal coming from microphone more as compare to the 1K resistor. If you want sensitive microphone do not use optional resistor. For Antenna use a piece of 12 inch hookup wire. Set a blank spot on a fm radio and slightly adjust the trimmer capacitor with any non conductive tool to tune the transmitter.
Sponsored Links
Privacy Policy
Copyright 2014 CircuitDiagram.Org. All rights reserved.
Hello Readers, We frequently add new circuit diagrams, so do not forget to come back often. Thank you.