Simple RIAA amp from c't magazine - Page 2 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th January 2003, 11:20 AM   #11
Nicke is offline Nicke  Sweden
diyAudio Member
 
Nicke's Avatar
 
Join Date: Jun 2001
Location: Sweden
Does this look familiar?:
Application note for LM833
  Reply With Quote
Old 8th January 2003, 10:07 PM   #12
lohk is offline lohk  Europe
diyAudio Member
 
lohk's Avatar
 
Join Date: Apr 2001
Location: Northern Noricum, near the Limes
Yes, Nicke, you are right, the develloper of this riaa-amp partly followed the Application note (admittely, if you can read the article, even with a link).

Werner,
yes ok. I am open to believe anything, but I like to convince myself by trial. Will you be so kind to post the schematic or a suitable link ? I never had the chance to hear a LFD MM0/Mistral Phonostage yet.
In what stage of development is your jfet preamp btw ?

Peranders, your RIAA preamp maybe much better, but it is far more complicated and surely more expensive to make. That is completely another league. But: The Highend preamps like yours have to take up the challenge by the simple ones, and they hopefully will be very much better. (otherwise...)
And isn't your preamp QSXM3 also non-inverting ?


I do not want to be envolved in a war about the 1001 possibilities of mm-riaa-preamps. I just wanted to post this amp - because I just happend to have made two.
I found the proposed design details suitable for me: I would have done it the same way anyway. I am convinced (by the article itself and the posted National Apllication Note) that getting high accuracy and low distortion is impossible with just one opamp. I have never heard an example, but I maybe wrong, I am open to anything. There are so many more possibilities...

Klaus

ps: The PCB is availlable at http:/www.emedia.de
Ordercode#0213224B for 8,- EURO
  Reply With Quote
Old 8th January 2003, 10:15 PM   #13
lohk is offline lohk  Europe
diyAudio Member
 
lohk's Avatar
 
Join Date: Apr 2001
Location: Northern Noricum, near the Limes
Default NE5534/NE5532

I think that for along time this opamp family was the only one available which could fulfill all the necessities for the use with audio:
1. Low noise
2. Good sound in many different applications
3. Low price

Isn't that enough ?

When I changed from a NAD amp (forget the type, with a single 5532 for two riaa channels) in the early eighties to a NAIM preamp I learned for the first time the the really mediocre sound of the turntable was partly because of the terrible preamp (the 3020 was better, sure).

Do you know how many 5534's in the mixing consoles and elsewhere your music has already passed before it got recorded to the master tape ? Better not ask...

Klaus
  Reply With Quote
Old 8th January 2003, 10:20 PM   #14
Nicke is offline Nicke  Sweden
diyAudio Member
 
Nicke's Avatar
 
Join Date: Jun 2001
Location: Sweden
Quote:
Originally posted by lohk
I am convinced (by the article itself and the posted National Apllication Note) that getting high accuracy and low distortion is impossible with just one opamp. I have never heard an example, but I maybe wrong, I am open to anything. There are so many more possibilities...

Klaus

You could try the one I built.
One opamp and it sounds really good....
Nicke´s phono amp

Nicke
  Reply With Quote
Old 8th January 2003, 10:26 PM   #15
Nicke is offline Nicke  Sweden
diyAudio Member
 
Nicke's Avatar
 
Join Date: Jun 2001
Location: Sweden
Default The original....

Here you can find the schematics of the original circuit on which I based my phono amp.
Thorsten Loesh´s phono amp
  Reply With Quote
Old 8th January 2003, 10:50 PM   #16
lohk is offline lohk  Europe
diyAudio Member
 
lohk's Avatar
 
Join Date: Apr 2001
Location: Northern Noricum, near the Limes
Come one, Nicke, do you know the price of one OPA637 ? And just one opamp ? What about the buffer ?
No I was talking about good and real simple (and cheap!). An opa637 (the high praise difet mega monk) is clearly beyond that. I must admit that I never heard one in a riaa amp yet, only in I/V DACout stages.

Klaus
  Reply With Quote
Old 9th January 2003, 06:43 AM   #17
Nicke is offline Nicke  Sweden
diyAudio Member
 
Nicke's Avatar
 
Join Date: Jun 2001
Location: Sweden
Default Expensive opamps & buffer´s

Have you heard of samples.......
Give it a try
  Reply With Quote
Old 9th January 2003, 07:11 AM   #18
Werner is offline Werner  Europe
diyAudio Member
 
Join Date: Jan 2002
Location: Belgium
Quote:
Originally posted by lohk

but I like to convince myself by trial.
...
Will you be so kind to post the schematic or a suitable link ? I never had the chance to hear a LFD
...
In what stage of development is your jfet preamp btw ?
I traced the PCB of a Mistral to come to the schematic, but as it is not public domain I do not feel free to post it. It is bog-standard, though, except for the RIAA which is not the often-seen ((R//C)+(R//C)) circuit. A last hint I can give is that the opamp's supply terminals do not look directly into the voltage regulators' outputs.

I reviewed it for TNT Audio (here).

As an aside, talking a couple of years ago to a commercial designer with a proven track record for phonostages, who at the time was working on a (fairly) low-cost phonostage, he admitted that after having gone through the usual suspects, a simple 5534 still sounded best in the front-end position.


My own JFET phono then. Originally this was something to be much Pacific-like. Later I mentally tacked on a second, alternative, output stage for more gain, an OPA637. So the basic architecture is JFET (front), RIAA, then to JFET (back) or OPA637 (back).
Power supply and additional tricks around the 637 still TBD.

All got delayed as I first had to finish my linestage. That's done now.
  Reply With Quote
Old 9th January 2003, 09:25 AM   #19
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Werner, could you email me the schematics please. I'm curious.

Also to everyone else: Musical Fidelty X-LP vinyl amp, does anybody have a schematics over this amp? Email me please or post here.
__________________
/Per-Anders (my first name) or P-A as my friends call me
  Reply With Quote
Old 9th January 2003, 05:04 PM   #20
halojoy is offline halojoy  Sweden
On Hiatus
 
Join Date: Nov 2002
Thumbs up Have a look at "Visions In Audio" - Werner's Homepage

Quote:
Originally posted by peranders
Werner, could you email me the schematics please. I'm curious.

Also to everyone else: Musical Fidelty X-LP vinyl amp, does anybody have a schematics over this amp? Email me please or post here.
Have a look at "Visions In Audio" - Werner's Homepage
He has some information about Phono stages here:
Also with some Schematics
http://www.angelfire.com/music4/audi...ns/design.html

Might not be the very latest of his DIY-works.
I attach one of the JFET preamps, Werner have tried.
One of the more simpler ones.

/halo
Attached Images
File Type: gif jfetpre_werner.gif (5.0 KB, 1076 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Simple MM only RIAA preamp x-pro Analogue Source 60 1st November 2013 11:17 PM
Needs simple RIAA pre-amp parmar664 Analogue Source 2 30th March 2007 11:29 PM
GC/RIAA (simple) preamplifer veteran Chip Amps 22 13th June 2006 09:31 PM
Simple PSU for RIAA / m-magnet lykkedk Solid State 0 16th October 2004 04:18 PM
Another Simple RIAA preamp ? CheffDeGaar Analogue Source 7 10th February 2004 11:34 AM


New To Site? Need Help?

All times are GMT. The time now is 04:54 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2