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Old 28th November 2002, 03:11 AM   #1
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Default FM/AM Tuner

I was wondering what you people suggest for a diy fm/am tuner most of the stuff Ive seen seems very low end...

Thanks,
Lyle Gorodn
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Old 28th November 2002, 07:32 AM   #2
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I have modules from Larsholt in Hirtshals, Denmark. The cost 35 USD (when I bought them). They have dual-gate MOSFET's, 1 µV sensitivity etc. Fair performance with possibilty to connect a PLL.
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Old 28th November 2002, 07:32 AM   #3
Raka is offline Raka  Europe
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Default Looks interesting

Hi,


Very good idea, we all forgot the tuners!
Any circuit scheme available by anyone?
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Old 28th November 2002, 04:11 PM   #4
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In EW&WW there have been schematics for everything after the front-end. So you should have something to get you the 10.7MHz IF. Then they have demodulation and stereo retrival. It was years ago, don't knoz if you would still find the components.

There even was a schematic in an article of a TUBE stereo tuner. Used 7 or 9 tubes. But it was very schematic.

I don't need to make it, got a tube stereo receiver in working condition
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Old 6th March 2006, 05:07 PM   #5
kiraly is offline kiraly  Denmark
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Hello Tunerfriends

I am the former owner of the old LARSHOLT tuner company, if anybody interested, I can supply original diagrams and drawings of all Larsholt tuners. In the past I have designed several new products for foll. companies:

NAD S-400
Primare S21 and S30
Classé tuner 1
Linn Kudos
Audiolabor

And for those who will buy a readymade kit, I also have some hundred pieces.
Regards
Tamas
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Old 6th March 2006, 05:24 PM   #6
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by kiraly
I can supply original diagrams and drawings of all Larsholt tuners.
Free?

/Hugo
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Old 6th March 2006, 06:33 PM   #7
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Default Sounds good to me

What parts would be included in your tuner sets? How ambitious would I have to be to get it working? What kind of performance could I expect?
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Old 7th March 2006, 08:47 AM   #8
lndm is offline lndm  Australia
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Default Re: FM/AM Tuner

Quote:
Originally posted by s0rce
most of the stuff Ive seen seems very low end...

Thanks,
Lyle Gorodn

keep in mind that a crystal set, despite poor sensitivity/selectivity etc, actually sounds very good.
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Old 7th March 2006, 09:13 AM   #9
forr is offline forr  France
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As DIY, there was an AM/FM Tuner designed by John Linsley-Hood and described in ETI around 1987. There was a kit from Hart (England) which I purschased.
The AM section was of synchrodyne type. I never get rid of the whistles and tuning was wandering.
The FM section had two original features : a PLL demodulation and a sample and hold stereo decoder. Low noise output, but I never could get a good stereo separation. I spent hours trying to debug it, without success. A full failure for more than $500.
However, I would welcome any DIY tuner circuits. The last one I saw was from Velleman.

~~~~~ Forr

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Old 7th March 2006, 09:16 AM   #10
forr is offline forr  France
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There was an FM receiving technique called "pulse counting".
Does anybody know more ?

~~~~~~~ Forr

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