300mW FM Transmitter

Posted on Oct 5, 2012

Here it is a brand new TX300 FM transmitter. The amplifier has exactly the same architecture as TX500 with the difference that TX300 has only one stage variable VHF amplifier. It is a cute schematic that was made for all of you who wanted something even simpler than TX500 and with not as many necessary parts. It is a perfect circuit for transmitting your music around the house and yard. Interesting feature is a gain control P1 that lets you adjust your desired output power and distance. If in case you want to replace Q2 with more powerful transmitter like 2n4427 or 2n3866 you will have to replace P1 with a resistor due to the higher necessary current. For much more info go to TX500`s page.

300mW FM Transmitter
Click here to download the full size of the above Circuit.

This power meter will let you test both the output power of Q2 (VHF amp) and Q1 (oscillator). Circuit is now on the separate board so you can fit the main circuit of the smaller PC board. Coils: TX300 uses exactly the same coils as TX500 w

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