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How to make a fm transmitter without amplifier? Answered

I want to build a fm transmitter with 400m range. I already have a custom made amplifier all I need to know is how to transmitt the signals. 
I don't need a mic I will play it through mp3 player. plaese help me and give me a circuit.

sorry for my bad english.

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ubdussamad
ubdussamad

Best Answer 8 years ago

i also recommend mpilchfamily's answer! just search for FM TRANSMITTER~! HERE is a simple circuit diagram you need to connect the output of your amplifier with the input of this circuit!
Hope it helps

full schem FM transmitter.jpg
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iceng
iceng

Answer 8 years ago

Ground addition to your collection :-)

A

gnds.gif
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steveastrouk
steveastrouk

Answer 8 years ago

They are NOT equivalent though. You can distinguish "chassis ground" "electrical ground" and "electrical reference"

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ubdussamad
ubdussamad

Answer 8 years ago

But in common circuits there is generally the ground is negative side of the battery and the electrical ground is generally used in ac power management!

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steveastrouk
steveastrouk

Answer 8 years ago

That's not what I am arguing. The symbols mean different things, not ground. And electrical ground is used in many areas than AC power.

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mpilchfamily
mpilchfamily

8 years ago

Have you conducted a simple internet search for FM transmitter schematics? It will give you a wide range of options but they can all be tricky to get working and dialed into the correct FM frequency you want.

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iceng
iceng

Answer 8 years ago

+1