NJM4580V MSOP in pre for recording? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, 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 7th October 2011, 11:38 PM   #1
diyAudio Member
 
Join Date: Feb 2009
Default NJM4580V MSOP in pre for recording?

Down to root of this thread, get me LM4562 specs in MSOP package - how?

My preamp stage, of my recorder, is filled with useless NJM4580V - need them replaced, but with what??

LM4562 - Dual High Performance, High Fidelity Audio Operational Amplifier

NJM4580V Datasheet pdf - DUAL OPERATIONAL AMPLIFIERˇˇ - New Japan Radio
  Reply With Quote
Old 7th October 2011, 11:59 PM   #2
diyAudio Member
 
Join Date: Feb 2009
While we are at it, some SUPER caps rated at 49uF 50V "not too big"??
And resistors??
Both in the input stage..
  Reply With Quote
Old 8th October 2011, 07:33 AM   #3
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by dude2010 View Post
Down to root of this thread, get me LM4562 specs in MSOP package - how?
NATIONAL SEMICONDUCTOR|LM4562MA/NOPB|OP AMP AUDIO DUAL HF 8-SO, POWERWISE | Farnell United Kingdom
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 8th October 2011, 01:51 PM   #4
diyAudio Member
 
Join Date: Feb 2009
What are you answering? "Package / Case:SOIC" !?
  Reply With Quote
Old 8th October 2011, 02:20 PM   #5
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 109
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by dude2010 View Post
My preamp stage, of my recorder, is filled with useless NJM4580V
You know something the datasheet's not revealing? Looks like a perfectly respectable opamp from the 'sheet. What's up with it?
__________________
Seek not the favour of the multitude...rather the testimony of few. And number not voices, but weigh them. - Kant
The capacity for impartial observation is commonly called 'cynicism' by those who lack it.
  Reply With Quote
Old 8th October 2011, 02:23 PM   #6
diyAudio Member
 
Join Date: Feb 2009
Does it matter?
If you must know, changing the OA, and caps, significantly changes spaciness, 3D and room in the recordings. I just can't find a MSOP with good specs...
  Reply With Quote
Old 8th October 2011, 02:26 PM   #7
diyAudio Member
 
Join Date: Feb 2009
I'm also looking for a way, to reduce/kill the noise of the switchmode supply if you have ideas!
  Reply With Quote
Old 8th October 2011, 04:30 PM   #8
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 109
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by dude2010 View Post
Does it matter?
No it only matters to the extent that I'm curious. My own curiosity matters to me (of course) but what matters to people is entirely a subjective thing.

Quote:
If you must know, changing the OA, and caps, significantly changes spaciness, 3D and room in the recordings.
Who says so? And to what opamp as a replacement?

About the SMPSU - it will be down to grounding and shielding/filtering. Which in a consumer product is normally strongly curtailed by lack of space. If its a portable recorder it will probably not be possible to maintain portability (i.e. compact shape) and fix this. What's the model incidentally?

Based on my experience I'd say fixing up the SMPSU noise would improve those 'audiophile' aspects better than swapping out that opamp.
__________________
Seek not the favour of the multitude...rather the testimony of few. And number not voices, but weigh them. - Kant
The capacity for impartial observation is commonly called 'cynicism' by those who lack it.
  Reply With Quote
Old 8th October 2011, 05:54 PM   #9
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
yeah, power supply noise is about steel boxes or walls, ferrite beads or toroids on wires, disk capacitors in the right places to kill RF, etc. Look at the Dynakit PAS2 preamp- two steel boxes, one for the power supply, an inner steel box for the sensitive bits. Look at an Ishida food weighing scale. They are measuring microvolt signals with a cycle time of 1 package a second some times. The switch mode power supplies are around the corner of a big steel box totally away from the measuring circuits. There are toroids on the DC wires, and also toroids wound into the AC input lines.
I made a big improvement in my disco mixer just by getting the power supply out of the steel op amp box entirely, and buying a wall transformer. I also put toroid chokes on + & - DC in, and put disk caps across the wound caps and at the op amp socket, and across the feedback resistor. Changed from 4558 op amps to 33078 or NJM4560 (both sound about same). Way quieter. There is no plug in solution to noise control. My disco mixer had a competent circuit designer, but the packaging guy was too sensitive to marketing and cost control, that part of the design was stupid. Sensibly designed packages that don't have glitz don't make it to the store shelf these days. Those kinds of products are limited to boutique stores with 1000% markup in megacities - or the internet. Look at repackaging to get rid of your SMPS noise, however hard it is. NJM4580's are a fairly competent op amp. Op amp noise is a white hiss, not any particular frequency, unless you suck too much current out of one like the LM4560, that will current limit snappily.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 8th October 2011 at 06:05 PM.
  Reply With Quote
Old 8th October 2011, 06:03 PM   #10
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by dude2010 View Post
What are you answering? "Package / Case:SOIC" !?
Well I wasn't sure what you were asking

So my link gave availability of SOIC package from Farnell and also full data sheet for that IC from an embedded link within that Farnell page.

If you are after something that would sound "better" I would suggest you at least consider and try the OPA2604 FET opamp.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  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
Phantom Power MSOP op-amps dude2010 Analog Line Level 0 3rd October 2011 04:58 PM
Upgrading an op amp in mic pre?? synap2012 Chip Amps 3 7th May 2008 03:26 PM
Op-Amp Pre for Sonic Impact? Buckapound Class D 11 21st August 2006 10:42 PM
noob pre/pwer amp recording ?s ghola Tubes / Valves 0 20th February 2006 07:38 AM
Pre-pre; phono; pre line ;device discrete (bjt/fet) o op. amplifier GIPIONE Solid State 8 18th December 2005 10:09 PM


New To Site? Need Help?

All times are GMT. The time now is 02:22 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