*I got over 100m range, under ideal conditions!
*Em área livre, consegui 100m com esse transmissor!
This small FM transmitter with a range of about 50 meters designed for connection to the USB port. With lots of mini-transmitters then you have a comprehensive, action-packed radio program. Due to the power supply via the USB port of a high frequency stability is achieved. Alternatively, the receiver, a battery 5 to 12 volts to operate.
FM Transmitter Construction
USB FM Transmitter Prototype It is not necessary to drill the transmitter PCB. All components will be soldered to the plate with their legs folded, like this:
The two transistors and the LEDs are polarized:
The transistor has a flat side, the LED a foot longer than the other is the anode (A), the other is the cathode (K). The audio cable (minijack) must be transformed from a stereo cable into a cable.
FM Transmitter Parts List
1 Ohm resistor 510 (green – brown – brown)
100 resistor 1 kOhm (brown – black – yellow)
1 MOhm resistors (brown – black – green)
1 capacitor 0.1 uF (0.1)
1 nF capacitor 47 (0.047)
1 capacitor 4.7 pF (479)
2 pF capacitors 22 (22)
1 variable capacitor 1.5 pF … 15
2 transistor BF 246 (F246A)
1 red LED
1 audio cable (minijack)
USB FM Transmitter Prototype It is not necessary to drill the transmitter PCB. All components will be soldered to the plate with their legs folded, like this:
The two transistors and the LEDs are polarized:
The transistor has a flat side, the LED a foot longer than the other is the anode (A), the other is the cathode (K). The audio cable (minijack) must be transformed from a stereo cable into a cable.
FM Transmitter Parts List
1 Ohm resistor 510 (green – brown – brown)
100 resistor 1 kOhm (brown – black – yellow)
1 MOhm resistors (brown – black – green)
1 capacitor 0.1 uF (0.1)
1 nF capacitor 47 (0.047)
1 capacitor 4.7 pF (479)
2 pF capacitors 22 (22)
1 variable capacitor 1.5 pF … 15
2 transistor BF 246 (F246A)
1 red LED
1 audio cable (minijack)
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