FM transmitter circuit made with discrete (patch) components

FM transmitter circuit made with discrete (patch) components

This SMD FM transmitter has an operaTIng frequency of about 80 to 115MHz. Under reasonable circumstances you will be able to receive its signal at a distance of about 200 meters. Although it is low-power, it might be illegal in your part of the planet .

Here's the circuit:

Depending on the electret microphone you use, you might have to tweek R4 to set the gain of the pre-amplifier. Depending on the Q of the LC-part (usually not very good when using off-the-shelf SMD parts) you may also have to re-bias the end stage of the circuit. For the coil you can use a ECM45T Series Inductor.

You can download the PCB design here (only 2.5Kb). It's a double-sided PCB in CorelDraw 3.0 format (zip compressed).

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