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TX - mW FM Transmitter

After building it and doing some testing with it I was amazed by how well this Phase Locked Loop circuit performs. If you like to experiment a lot, you will appreciate this inexpensive but externally helpful addition. You vary the capacitance of the varicap diode s by applying voltage supply between 1 - 8V.

Make TX a Stereo Transmitter!

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The reason is that if you apply voltages below 1V the capacitance may go as high as pF and we simply can't use that. This is a very helpful tool that will tell you if your transmitter's oscillator is working properly.

With this setup you will be able to use potentiometer to change the frequency of the transmitter. With this knowledge we replace C6 - 15pF capacitor with two varicaps and one resistor.

It is a perfect circuit for transmitting your music around the house and yard. It's stable, compact, very easy to build and connecting it to TX transmitter was a piece of cake!

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Besides that, it will also give you a quick visual way to check how much power is being transmitted. If you can't go through the entire FM band or if your frequency is out completely then you will need to change the inductance of the L1 coil.

PLL will then compare those frequencies and if they are not the same PLL with vary the voltage that is applied to the varicaps, until those two frequencies are the same. I hope that you'll have as much fun as I had while building this transmitter.

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If you apply 1V the capacitance will be around 34pF, and if you apply V the capacitance will be 12pF minimum. Before you even connect PLL circuit to the TX transmitter you will need to test if the oscillator is working properly.

If you want to use Phase Locked Loop PLL to digitally tune the frequency of TX then you will need to make small changes to the transmitter's oscillator. That much is enough to be able to use 1 - 8V voltage to change the oscillator's frequency.

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These caps eliminate the distortions form the DC supply and improve the sound quality greatly. We can tune through entire FM band MHz by applying the voltage to the varicaps. Now, you may wonder why do we need to start from 1V?

You can easily turn TX into a high quality stereo transmitter by connecting this stereo encoder module that you can either build it yourself or buy it as a kit. TX uses only two coils; one in the oscillator and the other one in the mW VHF amplifier so it should be fairly easy for anyone to build.

The second change that we will need to make is to use 2pF capacitor and connect it to the Q2 transistor's collector.

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It also includes built-in pre-emphasis and C5 for enhanced sound quality. PLL will use this to sample the frequency and compare it with digitally selected frequency.

I highly recommend that you have the transmitter and power meter on the same PCB. While assembling the transmitter care must be taken to make sure that C1 is directly connected to L1 and C9 to L2.