Why will I hear noise from the speaker when I use LM386 to receive RF?
Lounzi
Posts: 1
in Electronics
I've made two different circuits to receive RF using LM386 but they doesn't work. I've changed the values of C2 and L1 to change the frequency. I've also changed the gain but nothing happens.
The problem is that I hear a sound of noise or buzz from the speaker. When I touch Pin 3 (The input) or the Antenna, The sound become higher but anyway no radio station is received.
I've made a radio transmitter using a transistor before so, I turned it on. The receiver circuit received the song Which is the input of the transmitter. It receives no matter the values of the C2 and L1 of the Tank circuit so, I removed the tank circuit and connected the antenna directly to pin 3 and It also works receive the song.
Why it doesn't receive any radio station although it receive the signals that are transmitted by the transmitter circuit that I've made ?
What can I do to receive radio stations ? ( I live in area Where I can receive good radio stations AM and FM from my cell phone and Radio device )
Here is the details of the IC :kynix.com/Detail/274538/LM386.html
The problem is that I hear a sound of noise or buzz from the speaker. When I touch Pin 3 (The input) or the Antenna, The sound become higher but anyway no radio station is received.
I've made a radio transmitter using a transistor before so, I turned it on. The receiver circuit received the song Which is the input of the transmitter. It receives no matter the values of the C2 and L1 of the Tank circuit so, I removed the tank circuit and connected the antenna directly to pin 3 and It also works receive the song.
Why it doesn't receive any radio station although it receive the signals that are transmitted by the transmitter circuit that I've made ?
What can I do to receive radio stations ? ( I live in area Where I can receive good radio stations AM and FM from my cell phone and Radio device )
Here is the details of the IC :kynix.com/Detail/274538/LM386.html
Comments
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Was this your post @ AA?
http://db.audioasylum.com/mhtml/m.html?forum=tuner&n=16174&highlight=LM386&r=&search_url=/default.mpl?searchtext=LM386&b=AND&topic=&topics_only=N&author=&date1=&date2=&slowmessage=&ip=&sort=score&sortOrder=DESC&sortRank=Forum&forum=ALL
Looks like some good advice & suggestions there.
I am guessing you're trying to build a slope-detecting FM crystal radio analog?
The LM386, presumably, could be used to amplify the detected (audio) signal from the passive front end to drive a loudspeaker or an amplifier(?).
LM386 data and apps: http://www.ti.com/lit/ds/symlink/lm386.pdf
some design ideas for FM "crystal radios":
http://solomonsmusic.net/FM_CrystalRadio.html
http://electronbunker.ca/eb/FMCrystalSet.html
http://theradioboard.com/rb/viewtopic.php?t=6083
If you haven't tried DIYAudio's forums, you might want to. I think (?) FMtunerinfo has a forum as well -- if so, they might be worth a try, too.
No idea on my part, I'm afraid. Are there no more FM radio ICs on the market any more?
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Too much mumbo jumbo for me. A 50 buck receiver off of craigslist and call it a day.
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Too much mumbo jumbo for me. A 50 buck receiver off of craigslist and call it a day.
'zackly.
