Will S4580P work for a gainclone? - 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 3rd March 2011, 05:12 PM   #1
diyAudio Member
 
Join Date: Mar 2011
Default Will S4580P work for a gainclone?

Hi everyone,

I'm new to diy audio and looking to build a replacement for my dying stereo. In the interests of not spending any more money than absolutely necessary on my very first amp project I'd like to reuse any parts I can before buying new ones.

I've got some S4580P opamps that came out of my old sound card and I'm wondering, would they work in a gainclone to power 8ohm 20w speakers?

Here's the datasheet:

http://www.datasheetcatalog.org/data...auk/S4580P.pdf

Also, how do you tell if an opamp will be suitable or not?
  Reply With Quote
Old 5th March 2011, 07:35 AM   #2
diyAudio Member
 
Join Date: May 2008
An op amp is not a power amp, so no, the 4580 won't work for you. Whether an IC is suitable to drive speakers will be stated in its datasheet. A Gainclone is built around the LM3875.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 5th March 2011, 07:56 AM   #3
diyAudio Member
 
Join Date: Mar 2011
Thanks for the reply. I guess my question was more, how do you tell? The datasheet just looks like a bunch of numbers to me with none of them meaning anything. Which numbers do you look for to know if it can or cannot drive speakers?
  Reply With Quote
Old 5th March 2011, 08:28 AM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by KrisWood View Post
Thanks for the reply. I guess my question was more, how do you tell? The datasheet just looks like a bunch of numbers to me with none of them meaning anything. Which numbers do you look for to know if it can or cannot drive speakers?
The physical size of the device is one clue. Anything that can deliver "power" into a low impedance load (speaker) will have some means of clamping it to a heatsink to help get rid of the heat.

The data sheet gives a max output current for the device... 50ma was it ? That tells you it's for small signal work. Speaker current are in the amps region.

Maximum power dissipation of the device, again that tells a lot. 800mw is tiny. Anything up to 100 watts for a power chip is seen.

The devices used in gainclones are in a way just "power opamps" but if you study the data sheets you will see they mention high supply voltages, high output currents, also a minimum load impedance of say 4 or 8 ohms (as against 600 ohms minimum for most opamps).

You need to do a lot more reading I think but keep asking the questions.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 5th March 2011, 08:59 AM   #5
diyAudio Member
 
Join Date: May 2008
They usually have something like "Audio Power Amplifier" in the datasheet title.
And there are output power specifications.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 5th March 2011, 09:51 AM   #6
diyAudio Member
 
Join Date: Mar 2011
Thanks Mooly, I'm learning a lot from answers like yours. Each one gives me clues for what to read up on next!
  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
S4580P replacement igor0203 Digital Line Level 7 26th March 2014 04:06 PM
opa544 will not work as a Gainclone. Shoog Chip Amps 44 21st December 2009 02:46 PM
Is this similar to a gainclone? Will it work? theundeadelvis Chip Amps 7 23rd March 2008 01:02 AM


New To Site? Need Help?

All times are GMT. The time now is 09:57 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