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250MW FM Transmitter Circuit–FMUSER

250MW FM transmitter circuit

repost from HuaQiangDianZi

Transmitting frequency of the oscillator  is in FM 87.5-108 MHz band , and can be set to adjust the coil L1 and capacitor C8 . L1 coil must 0.8-1 mm in diameter 6 mm ( space between each wire must be about 1 mm ) cylinder supports 4 turn. The antenna used for this project can be a simple rod antenna or 60-70 mm copper wire which can supply a broad range of electronic items input voltages from 9 to 12 volts DC ( You can even use 18 volts DC.

You can use this schematic design a very simple FM transmitter electronics projects . FM band FM transmitter electronic project , which has an approximately 250mW transmit power ( something to make it work in a hundred meters or more ) . This FM transmitter electronic circuit is very simple, some common transistors and electronic components. T1 transistor can be a BC107, BC171 or equivalent, and as a small audio preamplifier amplified audio signal from the microphone. Adjust the variable resistor R2 from the input ( microphone ) audio signal level can be adjusted until the delivery to the T1 preamplifier ( amplified signal is applied to the T1, can generate an overshoot ) . Hartley oscillator is formed from T1, the signal transmitted to T2 ( the oscillator frequency depends on C8, C9 , and L1).

Transmitting frequency of the oscillator in FM 87.5-108 MHz band , and can be set to adjust the coil L1 and capacitor C8 . L1 coil must 0.8-1 mm in diameter 6 mm ( space between each wire must be about 1 mm ) cylinder supports 4 turn. The antenna used for this project can be a simple rod antenna or 60-70 mm copper wire which can supply a broad range of electronic items input voltages from 9 to 12 volts DC ( You can even use 18 volts DC

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