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Old 22nd March 2003, 11:09 AM   #1
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Default DIY Radio

I would like to build a little portable stereo FM radio, for site use, so it has to be robust, and this discounts most cheap commercial FM radios. I suppose I could just rebuild one I bought, but before I go down this route I would like to try DIY if possible.

So, I can use some of my various GCs for amps, I have speakers, but I would like to know if anyone has a schematic for a simple FM only tuner, or links to a manufacturer's chipset data sheets. Google, and even Sherlock comes up with nothing, and the old threads on this board are not really relevent.

Cheers
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Old 22nd March 2003, 12:11 PM   #2
DJG is offline DJG
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It would be really interesing to make DIY FM receiver!
I'm planing to do one myself. I need it on my motorcycle. Interested in participation?

I don't know what are your plans about the funcionality(stereo, presets, digital tuner, seek, etc.)? Please write some more about it.

I don't need any of those functions, except maybe digital tuner.

I think that TDA7000 is on of the FM receivers that are easy to built. But I think it requires some adjustments - and we don't want those, do we?

So, I'm asking other members: do you know any IC's for FM receiver that don't require too much external parts?

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DJG
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Old 22nd March 2003, 01:14 PM   #3
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Hi DJG

I'm basically looking for a stereo tuner, no display needed, and either a knob or up/down buttons for tuning.

I had a look at the Philips site for the TDA chips, the basic ones seem to be all mono, and the stereo ones seem to need some kind of control interface to get them to work
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Old 22nd March 2003, 02:44 PM   #4
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Jeah, I know! Stereo is very hard to achieve, because you need to have stereo decoder and that takes a lot of time and work to tune it up for optimal performance.
If you looked at TDA7000 datasheet you saw that it can be modified to have potenciometer for setting the frequency.
If my memory doesn't lie, I think that I once saw one IC similar to TDA7000 that was able to produce stereo sound. I think it was TDA7005, but I'm not sure.
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Old 22nd March 2003, 03:52 PM   #5
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Hey! Have you checked TEA5711? It's an AM/FM stereo receiver.
Too many external parts for me. Sorry. I will probably go for TDA7000 or TDA7010, because I want to put it in my pocket plug the earphones and listen while I'm driving.

Check it out and tell us if you are into DIY project.
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Old 22nd March 2003, 05:13 PM   #6
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http://www.semicon.toshiba.co.jp/eng...frequency.html
and
http://www.semiconductors.philips.co...7/75009421.pdf

/Hugo
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Old 22nd March 2003, 06:12 PM   #7
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Try doing a Google search for MC1310P. It is a stereo FM IC. The schematics that I saw look pretty simple, but I haven't tried to build one.
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Old 22nd March 2003, 07:25 PM   #8
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All I could find was that MC1310P is only a stereo decoder. I don't know?
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Old 22nd March 2003, 08:32 PM   #9
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I'd suggest finding an FM tuner module (antenna in, stereo line out) unless you really want to get tied up in RF design issues.

www.alps.com may be a place to start.
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Old 23rd March 2003, 10:33 AM   #10
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Check the FM tuner in ETI (electronics today international) that ran years ago. They started with a HF module giving out the 10.7 MHz multiplex and builded a nice stereo decoder around it. Dates:

march 1987, april 1987, july 1987 and august 1990. (not sure if this is complete but it should be the most important section)

Velleman had a nice kit, don't know if they carry it still.
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