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It also includes built-in pre-emphasis and C5 schematy elektroniczne online dating enhanced sound quality. 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.
That much is enough to be able to use 1 - 8V voltage to change the oscillator's frequency. Besides that, it will also give you a quick visual way to check how much power is being transmitted. 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.
Now, you may wonder why do we need to start from 1V?
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Before you even connect PLL circuit to the TX transmitter you will need to test if the oscillator is working properly. PLL will use this to sample the frequency and compare it with digitally selected frequency. Make TX a Stereo Transmitter! It's stable, compact, very easy to build and connecting it to TX transmitter was a piece of cake!
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.
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I highly recommend that you have the transmitter and power meter on the same PCB. I hope that you'll have as much fun as I had while building this transmitter. 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.
If you apply 1V the capacitance will be around 34pF, and if you apply V the capacitance will be 12pF minimum.
These caps eliminate the distortions form the DC supply and improve the sound quality greatly. 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.
You vary the capacitance of the varicap diode s by applying voltage supply between 1 - 8V. 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.
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The second change that we will need to make is to use 2pF capacitor and connect it to the Q2 transistor's collector. With this knowledge we replace C6 - 15pF capacitor with two varicaps and one resistor.
We can tune through entire FM band MHz by applying the voltage to the varicaps. It is a perfect circuit for transmitting your music around the house and yard. If you like to experiment a lot, you will appreciate this inexpensive but externally helpful addition.
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While assembling the transmitter care must be taken to make sure that C1 is directly connected to L1 and C9 to L2. After building it and doing some testing with it I was amazed by how well this Phase Locked Loop circuit performs.
With this setup you will be able to use potentiometer to change the frequency of the transmitter.