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How do radio reciever works?

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holax12

New Member
Hello,

I want to wirelessly control a switch, have been able to make a simple transmitter which transmitted voice and was able to receive via fm radio.
The major problem is making my own receiver, have tried some receiver circuits that i found online but they don't seem to work. Here is one of circuit i tried: FM Receiver 4 Transistor by BF184 | Circuit Project Electronic

Now i think knowing how the receiver work will really help me.

Ur contributions on how it works is highly welcome. Thanks.
 

audioguru

Well-Known Member
Most Helpful Member
The "piece of junk" radio you made has a single transistor as a super-regenerative receiver. It overloads easily by strong local starions and is a very poor AM radio. If it is tuned to one side of an FM station then it plays distorted muffled audio.
The other three transistors in the radio are an audio amplifier.

It works at a very high frequency so will not work if it is made on a breadboard. It needs a small pcb instead.
 
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holax12

New Member
Thanks for your reply, what corrections can be made to that circuit to make it function as a fm transmitter.
 

holax12

New Member
Thanks for your reply, what corrections can be made to that circuit to make it function as a fm receiver.
 

audioguru

Well-Known Member
Most Helpful Member
You need to learn electronics to see all the many parts of an FM receiver and what they do.
The very simple super-regenerative receiver you found will pick up a local FM radio station if you make it correctly. The sound will be distorted and muffled.
 

Papabravo

Well-Known Member
Thanks for your reply, what corrections can be made to that circuit to make it function as a fm transmitter.
There is no way to transform a receiver into a transmitter. They are different animals entirely.
 
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holax12

New Member
@ audio guru , Suppose i make a rf amplifier that is capable of amplifying small signal and i connect an antenna to the input of the amplifier, will anything be amplified.
 
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