FM TRANSMITTER

1587

1d 04:00:38

Just add the audio source to the end of the loose capacitor. This little gizmo should give 0.5W RF power. That's a lot. With half a watt maybe you'll cover 1km. The output is almost distortionless so no need for fancy harmonic filterings. Need help on the transistor though. So i basically need a transistor with transition frequency of at least 100Mhz (150Mhz best) and power rating of at least 2W. Ah and the gain should be 100 Any suggestions?

published 10 years ago

sumitdhingra

10 years ago

Hey bugger I am fan of your work. I have also made an FM TRANSMITTER and it's very much like yours but it wasn't working in reality. Can you check it in my circuits and give me suggestions on that. I would really appreciate it.

thebugger

10 years ago

Hi there. First i wanna say that FM transmitters are very hard to build test and exploit for several reasons. 1st you need inductors. Only god knows how much i hate coils. 2nd harmonic filtering. If the circuit is not properly designed you could end up jamming other stations and even police ones. Here you shpuld take great precaution because it's illegal to operate an fm transmitter of more than 50mW and let alone a harmonic rich one. 3rd often these circuits are hard to tune because if you get close to it to tune it you introduce your body capacitance into the circuit and disturb it. You finally think you tuned it you back up from it and it shifts once again. 4th. Parasitic cpacitance and imductance. When building these kind of circuits the layout of the components is important because they pickup disturbances from the different stages and get distorted once again. I really really dont recommend An FM transmitter for you. Try an AM transmitter. They work in the lower part of the RF spectrum (500Khz-1.5Mhz) so you should be able to obtain a more pure carrier by using an op amp. Ah in AM you can skip the inductors. Thats the beauty of AM.

thebugger

10 years ago

Ah and i wanna congratulate you on studying telecommunications. That's the best speciality ever

sumitdhingra

10 years ago

Thanks man for your time. I will now try to build an AM transmitter. I really appreciate it. And congratulations to you too on studying telecommunication. 😁

thebugger

10 years ago

I graduated last year. It's really interesting. Are you in high school or university

sumitdhingra

10 years ago

University. I will graduate in 2017. What's your age?

thebugger

10 years ago

Finished high school last year. That's where i studied telecommunications. I'm 19.

sumitdhingra

10 years ago

Great man! You inspired me today.

igorandrade

10 years ago

That's great! Good

harindra

10 years ago

In practical case whitch transistor should i bye

harindra

10 years ago

Tell m the transistor code to bye

circuitpro

9 years ago

Built it in real life using 2n3055 transistors, got almost 6 watts out of it!, thanks

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