FM Transmitter ( 88- 108 MHZ ) from Car MP3 player 6 Watts
Below is the versatile FM Transmitter build around car MP3 player ,which can deliver up to 6 Watts.
In this circuit RF signal is taken from a MP3 player built-in low power transmitter , it is than boosted by the two more RF stages ,
For making any RF transmitter circuit at least two meters are very necessary , one is frequency counter & the other is RF field strength meter .
In the first stage of transmitter one of the best driver transistor 2SC2053 were used .you can use the other transistor up to 500MW power for this stage. In the second stage another RF transistor 2SC1971 were used.also you can use any equivalent transistor. Note : L3 will be 4 turns , L6 will be 12 turns, Heat Sink required for C1971 (C2053 can be used ) .
Use fix 20 PF capacitor instead of variable capacitors (30 PF)
In this circuit RF signal is taken from a MP3 player built-in low power transmitter , it is than boosted by the two more RF stages ,
For making any RF transmitter circuit at least two meters are very necessary , one is frequency counter & the other is RF field strength meter .
In the first stage of transmitter one of the best driver transistor 2SC2053 were used .you can use the other transistor up to 500MW power for this stage. In the second stage another RF transistor 2SC1971 were used.also you can use any equivalent transistor. Note : L3 will be 4 turns , L6 will be 12 turns, Heat Sink required for C1971 (C2053 can be used ) .
Use fix 20 PF capacitor instead of variable capacitors (30 PF)
Simple field strength meter circuit
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