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Old 21st July 2011, 08:27 PM   #1
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Default Looking for "textbook" FM receiver schematic

Hello,

I need a basic "textbook" example of a FM audio receiver...but I'm not sure exactly what to look for, for best results.

There seem to be a ton of ways to make a receiver, whether it is is single chip, discrete components, transistorized...etc.

Here's one that keeps on popping up whenever I search: One transistor FM radio project

Does anyone have any experience with either of those circuits, and how would they perform? I recently picked up the book "Secrets to RF Design" for $1, hoping it would have some direction...but somehow, it does not.

Any ideas?

Thanks.

(If this is in the wrong section, a moderator can move it, of course).
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Old 22nd July 2011, 02:15 AM   #2
EUVL is offline EUVL  Europe
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This one is based on TDA7021 / TDA7040 chip set for FM stereo.

Mini-FM-Radio - ELEKTOR.de | Elektronik: Analog Digital Embedded Mikrocontroller Audio Messtechnik

Done correctly (i.e. not as that shown in Elektor), it does sound very decent.
And almost as simple as a single transistor radio. Not so compley as the JLH FM design.

FM/AM Tuner


Patrick
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Old 22nd July 2011, 02:47 AM   #3
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Awesome thank you.
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Old 22nd July 2011, 05:28 AM   #4
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Have you looked at Dave Johnson's Discover Circuits? He has a lot of circuits to choose from. Joe Carr's "Secrets..." isn't a cookbook, but you got a great deal for $1.
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Old 22nd July 2011, 03:53 PM   #5
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Quote:
Originally Posted by sofaspud View Post
Have you looked at Dave Johnson's Discover Circuits? He has a lot of circuits to choose from. Joe Carr's "Secrets..." isn't a cookbook, but you got a great deal for $1.
Oh yeah don't get me wrong. There's a lot of great information on technique and methodology. I was just hoping it would include a schematic and/or some direction. I thought it might be a good project to include.

I've looked on a lot of those circuit websites to very little avail. Either the FM circuits have been removed or they use some outdated chips etc.

I may just try Somersets 1-transistor design, and see how that works. I don't know too much about super regenerative design, so I may need to read up, so I lay it out correctly.

Last edited by FenderBender11; 22nd July 2011 at 03:58 PM.
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Old 22nd July 2011, 04:25 PM   #6
AndrewT is offline AndrewT  Scotland
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JLH did at least one FM radio design.
I think it was also offered as a kit a long while back.
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Old 22nd July 2011, 06:33 PM   #7
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Quote:
Originally Posted by AndrewT View Post
JLH did at least one FM radio design.
I think it was also offered as a kit a long while back.
I'm not familiar with JLH. Do you have a link?
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Old 22nd July 2011, 06:40 PM   #8
AndrewT is offline AndrewT  Scotland
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Sorry no link, I have not seen the article on the Web
I think the series of articles appeared in Wireless World during the 80s

Can anyone else help locating JLH FM tuner?
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Old 22nd July 2011, 07:18 PM   #9
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Ah that's alright. I was investigating TDA7000...but there seems to be a lot of hatred for it...I'm not after hi-fi though, just want to try to see if I can get a small scale radio working...

Should I lean towards transistor FM or an IC?
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Old 22nd July 2011, 07:28 PM   #10
DF96 is offline DF96  England
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I don't remember JLH doing a tuner. The classic Wireless World tuner was by Nelson-Jones. It was available as a kit from the same firm as some JLH designs, which may be why people associate it with him instead.

The N-J tuner was sometimes partnered with the Portus and Hayward stereo decoder, but alternatively one of the standard RCA or Hitachi chips could be used.
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