Phono to Line preamp? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 4th November 2003, 04:32 PM   #1
matt_uk is offline matt_uk  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Northants
Default Phono to Line preamp?

I am looking into building a small preamp so I can connect my turntable (Project Debut) through the Line In of my stereo.

Project and Nad both sell the exact thing for 40, which isn't much. But I was just wondering how to make my own. At uni our amplifier lectures were fairly generic and I don't have any of those notes to refer to anyway.

Matt
  Reply With Quote
Old 4th November 2003, 07:42 PM   #2
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
You need an amplifier with a specially shaped frequency characteristic, known as a RIAA amplifier. If you search for RIAA, moving-magnet (MM) or moving-coil (MC) on this forum or on Internet, you should find lots of information about the subject. If you want to know my approach to the problem, read Electronics World October 2003.
  Reply With Quote
Old 5th November 2003, 03:39 PM   #3
matt_uk is offline matt_uk  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Northants
Thanks for the reply, I didn't know what RIAA was all about before. My search led me to the following circuit which seems to be quite good. I am only interested in the MM stage so could someone please advise me how to remove (and what to remove) the MC circuitry.

For the caps/resistors should I make sure I have more than the required amount then value match them on a multimeter?

A bit more background on me, I am a digital electronics engineer and my analogue knowledge is crap! I'm good with VHDL and Verilog but that ain't much use here!!

Matt
Attached Images
File Type: gif el_cheapo_thorsten.gif (37.1 KB, 964 views)
  Reply With Quote
Old 5th November 2003, 05:12 PM   #4
matt_uk is offline matt_uk  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Northants
The attachment got lost somewhere, is this because my posts are moderated still? Anyway, the circuit was Thorsten's "El Cheapo" (possibly with OPA604s) which is why I asked about which components can be removed for MM only operation. Any help much appreciated!

I have seen some other designs (Pacific, Creek and a Tube design) under the Source/Analogue forum so am makling progress. But El Cheapo seems to be a recommended budget design.

Matt
  Reply With Quote
Old 5th November 2003, 05:13 PM   #5
matt_uk is offline matt_uk  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Northants
oops! heres the link

ultrasimple mm/mc riaa preamp

Matt
  Reply With Quote
Old 5th November 2003, 05:47 PM   #6
matt_uk is offline matt_uk  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Northants
the attachment has now appeared??

oh well, lets continue....
  Reply With Quote
Old 5th November 2003, 08:29 PM   #7
B.VDBOS is offline B.VDBOS  New Zealand
diyAudio Member
 
B.VDBOS's Avatar
 
Join Date: Aug 2003
Location: Auckland, New Zealand
Here's somthing

http://sound.westhost.com/project06.htm
http://sound.westhost.com/project25.htm

P.C.B's are available for progect 06
  Reply With Quote
Old 6th November 2003, 09:05 AM   #8
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
If you don't need the moving coil part, just remove the 100 ohm resistors, the 2SK147, the 2.2kohm, 68 ohm and 681kohm resistors, the 1uF capacitor and the supply filter circuit consisting of a 10H inductor and 2200uF, 2.2uF and 10nF capacitors.
  Reply With Quote
Old 7th November 2003, 06:31 PM   #9
diyAudio Member
 
Join Date: Oct 2003
Location: Pyrenees Audoise
Matt,

If you want to build, why not build something different? Elektor did a great valve design in the December 2000 edition.

Brian

ps SORRY ALL - OT for this Forum!
Attached Images
File Type: jpg riaa.jpg (33.4 KB, 786 views)
  Reply With Quote
Old 7th November 2003, 07:09 PM   #10
diyAudio Member
 
Join Date: Oct 2003
Location: Pyrenees Audoise
Another victim of the Great Attachment Snatcher........
  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
Best phono / line preamp 2KW Tubes / Valves 10 31st December 2011 01:28 PM
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 09:51 PM
AN M2 line upgrade to phono bartasas Solid State 0 10th June 2008 12:24 PM
ABX Switching Box for Phono + Line Preamps thermionic Solid State 0 11th February 2008 07:39 PM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 07:32 AM


New To Site? Need Help?

All times are GMT. The time now is 06:53 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