LM4562 (dual op-amp) simple preamplifier - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 27th December 2006, 06:40 PM   #1
veteran is offline veteran  Poland
diyAudio Member
 
veteran's Avatar
 
Join Date: Feb 2004
Location: Poland
Cool LM4562 (dual op-amp) simple preamplifier

This is my LM4562 based preamplifier. Noise free and transparent sound - this is what I can say after first tests. Output offset voltage (even without DC blocking caps) - about 1-3mV. This PCB can be used for every dual op-amp.

I used R3,R9: 2k, R4,R10: 680R.

schematic

Click the image to open in full size.

Click the image to open in full size.
__________________
Simple audio solutions
blog.unisonus.com
  Reply With Quote
Old 27th December 2006, 07:08 PM   #2
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Thumbs up veteran pre amplifier circuit for op-amps

.

The circuit looks good and I see no problems.
Not even if somebody would like to use higher gain.
(change R3/R9 to higher value)

Data:
Input impedance: 47 kohm
Output impedance: 47 ohm
HF Noise, high freq filter at input: 1 kohm + 47pF
Voltage gain: x 3.0 ( ~ +10dB )
Power supply: +/- 15V regulated


As you told, veteran,
this circuit would suit most any other audio op-amp.
The chosen input 47kohm is a good value.
And the gain, x3, is also often all we would need in an audio preamp.


One question, because I haven't studied LM4562 closely, yet.
How much Supply Current is drawn by one LM4562 chip (two channels)?


Thanks for sharing your schematic.
lineup
Lineup Audio Lab > for topclass Discrete Operational Amplifiers, Op-Amps
__________________
lineup
  Reply With Quote
Old 27th December 2006, 09:18 PM   #3
veteran is offline veteran  Poland
diyAudio Member
 
veteran's Avatar
 
Join Date: Feb 2004
Location: Poland
Exactly 10mA (Rl = 300R - 10k, supply = +-15V) for both channels.
__________________
Simple audio solutions
blog.unisonus.com
  Reply With Quote
Old 17th September 2007, 05:11 PM   #4
diyAudio Member
 
Join Date: Sep 2007
Hi,

I'm looking for a simple design for the LM4562. Can you describe how this design sounds?
  Reply With Quote
Old 17th September 2007, 06:03 PM   #5
veteran is offline veteran  Poland
diyAudio Member
 
veteran's Avatar
 
Join Date: Feb 2004
Location: Poland
Neutral, with lots of air. You can also bias this op-amp to work in a ~class A - this will give you a little bit wormer sound.

I have to say that my signal path is a typical DC in this application - without capacitors and there is only minimal offset.
__________________
Simple audio solutions
blog.unisonus.com
  Reply With Quote
Old 19th September 2007, 11:55 AM   #6
tino96 is offline tino96  Italy
diyAudio Member
 
Join Date: Mar 2003
Location: .
good work,
You have the PCB layout to share?
many tnx in advance
  Reply With Quote
Old 19th September 2007, 12:22 PM   #7
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Can someone explain the purpose of C6 and C7?

Just a noob trying to learn.
  Reply With Quote
Old 19th September 2007, 01:04 PM   #8
Tolu is offline Tolu  Germany
diyAudio Member
 
Tolu's Avatar
 
Join Date: Mar 2007
Quote:
Originally posted by veteran
Neutral, with lots of air. You can also bias this op-amp to work in a ~class A - this will give you a little bit wormer sound.

I have to say that my signal path is a typical DC in this application - without capacitors and there is only minimal offset.

do you have a circuit for bias in class A? Which values do you recommend?
  Reply With Quote
Old 23rd September 2007, 09:22 AM   #9
veteran is offline veteran  Poland
diyAudio Member
 
veteran's Avatar
 
Join Date: Feb 2004
Location: Poland
Quote:
Originally posted by tino96
good work,
You have the PCB layout to share?
many tnx in advance
Why not I'm working on another version of this board so here you are:

Schematic:
http://unisonus.com/pdf/DIY/LM4562_schematic.pdf

PCB top layer (description):
http://unisonus.com/pdf/DIY/LM4562_PCB_top.pdf

PCB bottom layer (tracks):
http://unisonus.com/pdf/DIY/LM4562_PCB_bottom.pdf
__________________
Simple audio solutions
blog.unisonus.com
  Reply With Quote
Old 23rd September 2007, 03:51 PM   #10
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
Are you using a buffer with unity gain in the second implementation for any special reason ?

Do you expect any difference in sound ?

Veteran :

Quote:
You can also bias this op-amp to work in a ~class A - this will give you a little bit wormer sound.
Warmer sound generally means added even order harmonics.
So does class A bias increase the distortion figures here ?

Cheers.
__________________
AM
  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
Audible Illusions Dual Mono Preamplifier edrel sison Tubes / Valves 6 7th September 2011 10:57 PM
Aleph P1.7 Dual Mono Block Preamplifier Bengali Swap Meet 0 27th December 2008 12:47 AM
Simple Valve Preamplifier mangrovejack Tubes / Valves 15 7th April 2008 12:34 AM
Looking for a simple preamp to use with an LM4562 PierreG Chip Amps 17 18th September 2007 08:16 PM
looking for simple preamplifier YUTK Solid State 0 5th July 2005 02:53 AM


New To Site? Need Help?

All times are GMT. The time now is 06:08 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