FM/AM Tuner

s0rce · 28th November 2002, 04:11 AM

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

peranders · 28th November 2002, 08:32 AM

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.

Raka · 28th November 2002, 08:32 AM

Hi,

Very good idea, we all forgot the tuners!
Any circuit scheme available by anyone?

Havoc · 28th November 2002, 05:11 PM

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

kiraly · 6th March 2006, 06:07 PM

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

Netlist · 6th March 2006, 06:24 PM

Quote:

Originally posted by kiraly
I can supply original diagrams and drawings of all Larsholt tuners.

Free?

/Hugo

JSprague · 6th March 2006, 07:33 PM

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?

lndm · 7th March 2006, 09:47 AM

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.

forr · 7th March 2006, 10:13 AM

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

§§§

forr · 7th March 2006, 10:16 AM

There was an FM receiving technique called "pulse counting".
Does anybody know more ?

~~~~~~~ Forr

§§§

28th November 2002, 04:11 AM	#1
s0rce diyAudio Member Join Date: Nov 2002 Location: Toronto	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

28th November 2002, 08:32 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me

28th November 2002, 08:32 AM	#3
Raka diyAudio Member Join Date: Aug 2002 Location: Close to Oistrakh	Looks interesting Hi, Very good idea, we all forgot the tuners! Any circuit scheme available by anyone? __________________ What is beyond the speaker?

6th March 2006, 07:33 PM	#7
JSprague diyAudio Member Join Date: Nov 2004 Location: Houston, Texas	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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28th November 2002, 05:11 PM	#4
Havoc diyAudio Member Join Date: Feb 2002 Location: Belgium	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

6th March 2006, 06:07 PM	#5
kiraly diyAudio Member Join Date: Mar 2006 Location: Countryside in Denmark	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

7th March 2006, 10:13 AM	#9
forr diyAudio Member Join Date: Dec 2004 Location: Next door	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 §§§

7th March 2006, 10:16 AM	#10
forr diyAudio Member Join Date: Dec 2004 Location: Next door	There was an FM receiving technique called "pulse counting". Does anybody know more ? ~~~~~~~ Forr §§§

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