Phono-pre-amp+power supply pcb - 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 12th November 2010, 02:03 PM   #11
Leon08 is offline Leon08  Germany
Banned
 
Join Date: Sep 2010
Location: at Home
I have no experience with this circuit, but similar one from this site:
Hi-Fi RIAA Phono Preamp

The preamp in the Application note AN-1651 there are two versions.One is complete passive and other active/passive.And they are designed for moving coil pickups and not the standard moving magnet type phono pickup.There is no power supply regulation.

And here you can read about the cartriges.
http://en.wikipedia.org/wiki/Magnetic_cartridge

Last edited by Leon08; 12th November 2010 at 02:24 PM.
  Reply With Quote
Old 12th November 2010, 05:17 PM   #12
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Thanks!

Thanks very much for the explanation. Is it possible to make the
circuit (active/passive) in AN-1651 suitable for both MM and MC
cartridge by adding a small circuitry in the input?

Roushon.
__________________
S. Roushon
  Reply With Quote
Old 12th November 2010, 07:26 PM   #13
Leon08 is offline Leon08  Germany
Banned
 
Join Date: Sep 2010
Location: at Home
Possible is this of course, but you need to change the overal gain because moving-coil cartridges generate an even lower voltage signal than a moving-magnet type cartridge. This is because the moving coil cannot be large enough (it would be too heavy) to generate equivalent voltage levels. The resulting signal is only a few hundred microvolts, and thus more easily swamped by noise, induced hum, etc.


And I think the two op-amps at the top of the circuit are for the regulated power supply.It's done by op-amps and not by ic regulators.I think you can drop them and all associated parts and use lm337, lm317 instead.It will be simplier and cheapier also.You need then only three LME49710

Last edited by Leon08; 12th November 2010 at 07:46 PM.
  Reply With Quote
Old 12th November 2010, 08:39 PM   #14
Leon08 is offline Leon08  Germany
Banned
 
Join Date: Sep 2010
Location: at Home
Then the third op-amp in that sircuit is a dc servo, so you can drop it too and use a simple capacitor.And then omly two op-amps remain.
So it's better then if you use the circuit from the site wich I referred and you have no problems.
This is also active/passive design.
  Reply With Quote
Old 14th November 2010, 01:59 AM   #15
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Thanks again

Thanks Leon for opening my eyes. I can remove the dc servo completely as
I already have a cap on the signal path in the amp and also there
is dc servo in the main amp (LM3886). Regarding MM/MC cartridge I am
unable to decide now as I do not have the TT yet so do not know
which type of cartridge it will have. I have planned Project Debut III which
has MM type I think. The supplier will inform me in few weeks what
will they get (import).

Can I replace the NE5532 IC in your referred circuit by LM4562/AD8620? As I
already have these ICs. I think I can, but asking just in case.

Regards
Roushon.
__________________
S. Roushon
  Reply With Quote
Old 14th November 2010, 01:56 PM   #16
Leon08 is offline Leon08  Germany
Banned
 
Join Date: Sep 2010
Location: at Home
There is also some other designs wich may be interesting for you.
Here is one Hagerman Technology LLC: Bugle Opamp Moving Magnet Budget Phonostage DIY Kit
  Reply With Quote
Old 14th November 2010, 02:02 PM   #17
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Moved to analog source for more phono people to easily see.
  Reply With Quote
Old 15th November 2010, 05:59 AM   #18
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Thanks

Quote:
Originally Posted by Salas View Post
Moved to analog source for more phono people to easily see.
Thanks!

Regards
__________________
S. Roushon
  Reply With Quote
Old 15th November 2010, 06:03 AM   #19
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Quote:
Originally Posted by Leon08 View Post
There is also some other designs wich may be interesting for you.
Here is one Hagerman Technology LLC: Bugle Opamp Moving Magnet Budget Phonostage DIY Kit
Thanks again. I did see this site before. In fact the PS
unit idea (before regulator) I got from there. But the preamp
circuit says it is partial. I am not sure what is missing there.
I do not expect a complete circuit as they sell product.

Regards
Roushon.
__________________
S. Roushon
  Reply With Quote
Old 15th November 2010, 01:36 PM   #20
Leon08 is offline Leon08  Germany
Banned
 
Join Date: Sep 2010
Location: at Home
I think this bugle is not very good design because there are such big resistors in the signal path.They must make noise, but you can calculate your own component values.
  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
A PCB-design for Phono-pre-amp Roushon Analogue Source 19 17th May 2010 06:41 AM
Power Supply for Aikido Phono Pre Binaural Tubes / Valves 16 9th November 2008 08:45 PM
Power Supply For Pre/ Head Phone & Phantom... (PCB) Ayne Power Supplies 0 28th April 2007 05:10 PM


New To Site? Need Help?

All times are GMT. The time now is 08:29 AM.


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