Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Low Power Design Suggestion?
Low Power Design Suggestion?
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
Thread Tools Search this Thread
Old 9th October 2012, 03:24 PM   #1
Redshift187 is offline Redshift187  Canada
diyAudio Member
Join Date: Aug 2008
Default Low Power Design Suggestion?

I'm looking to replace the mid-high amp in my computer speaker setup (2.1), and thought it might be a good opportunity to try something solid state for the first time. It doesn't necessarily need to be simple, all I need is a schematic that I won't have to "complete" myself, since I'm completely new to SS.

I have a +13V DC power supply, 4 ohm speakers and would like an output power between 4W and 10W. Frequency response need not go below 200 - 250 Hz, but I should be capable of figuring out the filtering for that.

The original amp is a TDA8511J, and I'm considering using an LM4940, but thought I would check into SS for a change.

Any suggestions?
  Reply With Quote
Old 9th October 2012, 06:11 PM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

13V DC will give you about 4 W into 4 ohms and your in car amplifier
territory. Car amplifiers generally use unusual (compared to hifi) output
topologies to get good output voltage swing close to each rail, a typical
hifi amp might only swing to 2V below each rail, 9V versus 13V is a lot.

If you want more power you need a bridged arrangement and that
gets quite complicated in discrete SS for such a simple application.

Chip-amps rule at this sort of supply voltage and power, I think
going for discrete SS is asking for far more trouble than its worth.

rgds, sreten.
  Reply With Quote
Old 9th October 2012, 07:12 PM   #3
AudioSan is offline AudioSan  Norway
diyAudio Member
Join Date: Feb 2009
9V output will give you 20W peak at 4ohm.
  Reply With Quote
Old 10th October 2012, 03:52 PM   #4
Redshift187 is offline Redshift187  Canada
diyAudio Member
Join Date: Aug 2008
Thanks for the replies. After more research, I've decided maybe I would like to build a bigger power supply and an F2J.
  Reply With Quote


Low Power Design Suggestion?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY Max Power Low Cost Amplifier Design simon7000 Solid State 48 23rd May 2012 08:55 PM
Class A low power (5-10w) amp suggestion needed s3tup Solid State 42 13th April 2010 06:45 PM
Possible to design a high-power class D amp with a low output impedance? 454Casull Class D 2 23rd February 2009 07:33 PM
Low Voltage (+70V) Power Supply Design mwl6m Power Supplies 43 1st August 2007 01:00 PM
Cheap low power design for computer speakers haut Solid State 2 5th March 2004 04:47 AM

New To Site? Need Help?

All times are GMT. The time now is 01:43 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio