Anyone built the phono pre from LM4562/LME49720 datasheet?

Tolu · 1st October 2009, 11:26 AM

Hi

anyone tried the datasheet version of the RIAA phono preamp?

ahaja · 1st October 2009, 12:38 PM

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

audiosteve · 1st October 2009, 01:30 PM

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.

Tolu · 1st October 2009, 03:46 PM

I am talking about this schematic!

audiosteve · 1st October 2009, 03:57 PM

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.

ahaja · 1st October 2009, 06:36 PM

>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

Artie · 28th February 2010, 01:05 PM

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

arthur · 28th February 2010, 01:55 PM

passive means that the eq correction is not built inside the amplifier stage(not in the feedback network of the op-amp gain stages)

Artie · 28th February 2010, 02:15 PM

Ah . . . thanks Arthur.

binspaul · 3rd March 2010, 03:01 AM

Hi,

Please see the thread: Phono preamplifier using OPAMPS..

Quote:

Originally Posted by Tolu

I am talking about this schematic!

Best regards,
Bins.

1st October 2009, 11:26 AM	#1
Tolu diyAudio Member Join Date: Mar 2007	Anyone built the phono pre from LM4562/LME49720 datasheet? Hi anyone tried the datasheet version of the RIAA phono preamp?

1st October 2009, 01:30 PM	#3
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	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. __________________ Nihilism is best done by professionals.

1st October 2009, 03:57 PM	#5
audiosteve diyAudio Member Join Date: May 2004 Location: Niwot, CO	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. __________________ Nihilism is best done by professionals.

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1st October 2009, 12:38 PM	#2
ahaja diyAudio Member Join Date: Oct 2004 Location: Poznań	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

1st October 2009, 06:36 PM	#6
ahaja diyAudio Member Join Date: Oct 2004 Location: Poznań	>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

28th February 2010, 01:05 PM	#7
Artie diyAudio Member Join Date: Jul 2007	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

28th February 2010, 01:55 PM	#8
arthur diyAudio Member Join Date: Oct 2001 Location: .	passive means that the eq correction is not built inside the amplifier stage(not in the feedback network of the op-amp gain stages)

28th February 2010, 02:15 PM	#9
Artie diyAudio Member Join Date: Jul 2007	Ah . . . thanks Arthur.

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