Anyone built the phono pre from LM4562/LME49720 datasheet? - diyAudio
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Old 1st October 2009, 12:26 PM   #1
Tolu is offline Tolu  Germany
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Default Anyone built the phono pre from LM4562/LME49720 datasheet?

Hi

anyone tried the datasheet version of the RIAA phono preamp?
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Old 1st October 2009, 01:38 PM   #2
ahaja is offline ahaja  Poland
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Hola
I made a passive eq. Very good sounding phono stage. If you add another stage in front of it you'll be able to listen to MC LO carts. But ... quality of power supply is very important.

K
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Old 1st October 2009, 02:30 PM   #3
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I built the Bugle preamp half kit from Hagerman and put 4562's in it. I haven't done any measurements (no tools) but, to my ears, its sounds excellent.
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Old 1st October 2009, 04:46 PM   #4
Tolu is offline Tolu  Germany
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I am talking about this schematic!
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File Type: gif RIAA_LME49720.gif (9.1 KB, 1226 views)
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Old 1st October 2009, 04:57 PM   #5
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That is similar in concept to the Hagerman design. Hagerman also uses passive EQ but uses three, not two, gain stages. I think if you were to build the datasheet ref design you would be very pleased with the results considering the cost, which would be very low.
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Old 1st October 2009, 07:36 PM   #6
ahaja is offline ahaja  Poland
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>Tolu
Yes, exactly.
I changed the gain to 45dB.
Pre stage (MC LO) in front of this schematic gives me 25-40dB (variable - dip switch). Is very quiet. Yoy can also add Neumann time constant.

I tried a few years ago Bugle preamp. Sounds soft compared to this from datasheet LME49720. And is more, more noisy - I left it because I coudn't enjoy with MC LO.

K
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Old 28th February 2010, 02:05 PM   #7
Artie is offline Artie  United States
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I hope no one minds if I revive this topic, but its right in line with my question. (Two questions, actually.)

1. I don't really understand why this is called a "passive EQ", since it obviously has two major active components in it. What am I missing here?

2. The same data sheet also has two other RIAA circuits. What are the advantages of one over the other?

These same three RIAA circuits are contained in several of the National LME series IC's data sheets.

Thanks all.
Artie
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Old 28th February 2010, 02:55 PM   #8
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passive means that the eq correction is not built inside the amplifier stage(not in the feedback network of the op-amp gain stages)
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Old 28th February 2010, 03:15 PM   #9
Artie is offline Artie  United States
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Ah . . . thanks Arthur.
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Old 3rd March 2010, 04:01 AM   #10
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Default This might help...

Hi,

Please see the thread: Phono preamplifier using OPAMPS..

Quote:
Originally Posted by Tolu View Post
I am talking about this schematic!
Best regards,
Bins.
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