looking for class AB amplifier schematic - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 19th December 2011, 07:55 AM   #1
Mourgos is offline Mourgos  Greece
diyAudio Member
Join Date: Dec 2011
Location: Athens
Default looking for class AB amplifier schematic

Hello guys! I'm looking for schematic about class AB amplifier for my little project!

My project is diy car audio amplifier!
the power supply is from Rod Elliot Switchmode Power Supply For Car Audio with dual torroid (two power supplies in one PCB)

I want drive 4 and 2ohms loads and power output about 160-180watt RMS on 4 ohms
any ideas? Thanks!
  Reply With Quote
Old 19th December 2011, 10:47 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
180W into 4r0 is equivalent to 38Vpk and 9.5Apk.
To drive a 4ohm speaker expect current demand to be as high as 28Apk.
If you go to 2ohm speakers then the current demand could go to 56Apk.

That is a mighty specification for a 13.8Vdc powered PSU.

Are you sure you know what you need and what you are taking on?
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 19th December 2011, 12:31 PM   #3
Account disabled at member's request
Join Date: May 2006
I would go here, reliable, small, easy and simple to build with very good specs. See if the members there will help you out with a slightly more powerful version, just takes more output devices and use fan cool. Be prepared to upgrade your car battery and dont play music loud with the motor off.

"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets
  Reply With Quote
Old 19th December 2011, 07:44 PM   #4
Mourgos is offline Mourgos  Greece
diyAudio Member
Join Date: Dec 2011
Location: Athens
AndrewT i know that friend! My PSU is strong, 4x IRFZ48N per rail of transformer and +/-56vDC output for each channel (Dual Torroids)

homemodder good amp but i dont want chip driver (LME49830)... I have 2x Odyssey 2150 batteries (5000A peak each) dont worry
  Reply With Quote
Old 20th December 2011, 01:18 PM   #5
Account disabled at member's request
Join Date: May 2006
My main interest in audio is hi end automotive based audio, I have been using discrete circuits before I entered univ. These new chip based amps are excellent for this use, I feel and Im going to start experimenting heavily on these, simply because they are so simple and reliable. You have to keep in mind as primary, high temperature in cars and here you need reliability and good protection circuits or you could wind up with a fire consuming your car. Besides these amps Id think you could go for one of the higher power DX amps shown here or the Self based circuit shown by Ostripper, A Class AB Amp for diyAudio. Keep to amps that have better low frequency reproduction as car speakers have defiency here and reason why many use subs. Make sure that the output can handle 2 Ohm loads as most car speakers are 4 and these will certainly dip below so youll be looking at adding extra 2 pairs of output devices at least to be safe and in the light of the temperatures.

Those Odysseys 2150 is just what you need, I have three kinetiks in one of my cars but Im running more amps at much higher power figures. Good luck with your builds, its really rewarding putting such a system working especially when you DIY the whole lot. The feeling was like having s_x, the first time I turned the volume knob on my first DIY build about 20 years back.
  Reply With Quote


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
How much Class A in a class ab amplifier madtecchy Solid State 6 4th November 2011 04:26 AM
Class AB Amplifier - New to the analog world ea6b607 Solid State 40 28th March 2011 07:28 PM
Class AB Amplifier USFishin Solid State 1 28th March 2004 03:25 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM

New To Site? Need Help?

All times are GMT. The time now is 09:41 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2