One transistor FM radio transmitter

DISCLAIMER:
This device has been made, and used, only for educational and informational purposes. No pirate broadcast was involved in mind.

My home-made radio transmitter, with and without antenna connected. The circuit transmits in the range 88-108MHz. With a good antenna, proper power supply (in this case, a small 9V battery... something like 14V NiCd or NiMH would be more appropriate) and grounding, the range you can transmit the signal can be more than 1000m (1 kilometer) !

Circuit scheme at http://inflater.wz.cz/site/el/fm_t.htm

Category:

Science & Technology

Tags:

• home
• made
• fm
• radio
• transmitter
• transistor
• npn
• 2sc

[cleosimble]

IM WONDERING WHAT COMPUTER PROGRAM U AND IF ITS FREE(YES MY FAV SONG)

[TheReal1inflater]

@cleosimble WinAmp 5 with opacity 200 percent or so....

[keykeythe1]

hi, me 2 please, can u pm me please,

[TheReal1inflater]

wtf?

[CDRWXP]

Can you please tell me how it works?

circuit and the components used

[TheReal1inflater]

The circuit scheme is in the video description.

[bjtaudio]

@CDRWXP He just boosting the RF output power of the fm transmitter, with an external amplifier, to do this you need to access the actual antenna inside the fm transmitter unit. Most manufactures run the antenna wire amongst the left and right audio inputs bundled all within the audio input lead. To get better results thou you need to open up the transmitter and remove the attenuator network and fit an external antenna. It's all surface-mount components..need a soldering iron.

[bjtaudio]

It appears, your boosting the output from the mini Fm transmitter, with an external RF amplifier , it works! What you can do is open up the transmitter and remove the attenuator network if it has one and you will get lot more signal and you dont need the amp. The antenna can be disconnected from the audio input lead and a external antenna wire can hang out of the unit. It can go upto a few hundred meters on a typical radio. You can try adding cascading amplifier stages too and go even further.

[venkatagiri0813]

too fast