FM Reciever

343

03:18:07

Although it does not sound very good, it does work. The green input node is where the antenna goes. The purple node is where the speaker goes. Replace the 10 pF cap right by the input node with a variable cap with a range of 1.8 to 30 pf (for channel  tuning). The trimmer pot on the top is the volume control.

published 10 years ago

nikisalli

10 years ago

Are those transistors bf199?

hurz

10 years ago

The chance, this is a working FM receiver, is almost zero!

nikisalli

10 years ago

Hem @hurz greatscott on youtube made that...

nikisalli

10 years ago

With the same circuit

nikisalli

10 years ago

And it works

thebugger

10 years ago

Not likely to be the same circuit. As hurz said the chance for this to work is 0%. For instance there isn't any DC source. Plus these little gizmos are illegal because they tend to pollute the electromagnetic spectrum a lot with harmonics.

hurz

10 years ago

Which YT video you reference? I have some spare time and can check how the circuit suppose to look actually.

nikisalli

10 years ago

https://youtu.be/h_F3J4vyzNk

hurz

10 years ago

Ok, schematic at 3:17 shows not a normal opamp, its an audio amp LM386. You missed the DC supply which is connected to the pot ; the plus input is grounded while minus is used to connect to the FM to "AM converter" what this circuit is actually doing beside some extra gain. Hope this clarifies.

hurz

10 years ago

Here the datasheet www.ti.com/lit/ds/symlink/lm386.pdf

NateDogg1232

10 years ago

Thank you guys. I just wanted to see how this worked.

NateDogg1232

10 years ago

Thanks hurz for the datasheet.

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