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Topic:
Make an FM receiver using the same idea of this circuit
This thread has 2 replies. Displaying all posts.
Post 1 made on Friday March 9, 2018 at 05:02
lingyueqing
New Member
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March 2018
1
I made this circuit and it works properly but I need to make an FM receiver using the same idea of this circuit (common base).

Would you tell me what changes should I make so that the circuit is able to receive FM waves instead of transmitting it ?

I've tried to connect an antenna to the base of the transistor, and connect a 8-ohm speaker(CDM-10008: [Link: kynix.com]) in parallel with the tank circuit but it doesn't work. Also, I tried to connect it in series it doesn't work as well ?!

I have one more question: When I receive radio wave from this circuit using a radio receiver device, It receives the waves on many frequencies such as 108 MHz and 95 MHz.

when I change the values of capacitor and coil of the tank circuit, the frequencies change but it still receives on many frequencies.

I connected a capacitor of 1000uF instead of C2 ( To be out of the range 87 - 108 MHz ) but the receiver still receives signals.

I connected a wire instead of the coil ( with C2 = 22 pF ) but it still also receives.

Is that normal ? or have I made something wrong ?

Thanks in advance,

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Post 2 made on Saturday March 10, 2018 at 07:20
buzz
Super Member
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May 2003
2,562
Post 3 made on Sunday April 22, 2018 at 11:36
Ernie Gilman
Yes, That Ernie!
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December 2001
27,800
On March 9, 2018 at 05:02, lingyueqing said...
I made this circuit and it works properly but I need to make an FM receiver using the same idea of this circuit (common base).

Why do you need to use the same idea as this circuit?
Isn't that a common emitter configuration? It's been a long time since I looked at actual circuits.....
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw


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