FM Radio Reciever Filter

417

03:23:23

Simplest FM Radio, catches only 16MHz( small bandwidth of 0.1Mhz) . The AC source is an antenna.
It catches a particular frequency and then increases it and passes it throw resistors.
A speaker will catch the blue peaks simultaneously at about ultrasonic frequency. But as the frequency would shift slightly (few khz), the change in frequency would be im audible range, making a person hear a slight click. By this way info can be transfered from one place to another. The AND Gate wont allow other frequencies to pass, attenuating them as they reaches below 500mv.

published 10 years ago

stanislav_maslovski

10 years ago

No, it is not a radio receiver.

Ashish_kumar_4

10 years ago

Why cant it be?? It catches a particular frequency and then increases it and passes it throw resistors to depict speakers. The speakers in real life would work by AM modulation.

stanislav_maslovski

10 years ago

No, speakers will not work at radio frequency, you should first demodulate the AM signal.

hurz

10 years ago

Ok, let us see this just as a concept. The opamp stage can be seen as so called "limiter amplifier" and would eliminate all AM information, but whats left over would be phase and frequency, right? This a typical concept (partly) in FM receiver after tuner stage before FM demodulation with e.g. a PLL. Does this help?

stanislav_maslovski

10 years ago

hi, hurz. 13 seconds difference :)

hurz

10 years ago

;)

Ashish_kumar_4

10 years ago

Ok an FM small Band reciever with a demodulator instead of apeakers. Ok?

Ashish_kumar_4

10 years ago

Have to add a proper demodulator though

hurz

10 years ago

I like it to keep it simple, however i think you need to read first some more basics. Probably start here https://en.wikipedia.org/wiki/Receiver_(radio)

Ashish_kumar_4

10 years ago

I added the demodulator. Works on quadrature principal. Please check and tell

WTFCircuit

10 years ago

You are in the AM range!

Ashish_kumar_4

10 years ago

I am not talking about standards, i am talking about modulation.

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