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

Chip Amps Amplifiers based on integrated circuits

Best Chip amp for powered PA speaker?
Best Chip amp for powered PA speaker?
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 17th June 2004, 03:56 PM   #1
clemon is offline clemon  Canada
diyAudio Member
Join Date: Jun 2004
Location: Kitchener, Ontario CANADA
Default Best Chip amp for powered PA speaker?

Hi all,

I'm working on a design for a powered PA speaker, and would like to poll the forum for opinions as to the best chip amp to use.

My goal is to create a nice compact unit to fit into one of my speaker cabs. It should run 100+ watts into a 4 Ohm load (pair of 8 Ohm cabs in parallel). I'd also like to build in 2 switchable mic/line channels.

I'm currently looking at the LM833 to build lo-z to hi-z converter, preamps and tone controls for each input channel. I'm on the hunt for a compatible mixer circuit.

I'm debating between the LM4780 in parallel (120W@4 ohm), and the LM4651/2 (170W@4 ohm) amplifier circuits.

Any thoughts/suggestions/warnings for either of these designs? Is there another amplifier I should be considering? Alos if anyone out there has any schematics for the mixer portion of my plan, I'd love to see them!

Thanks much.
  Reply With Quote
Old 17th June 2004, 04:30 PM   #2
officeboy is offline officeboy  United States
diyAudio Member
Join Date: Nov 2003
Location: NW Washington
Send a message via MSN to officeboy
What you are proposing shouldn’t' be too hard. But the LM4651/2 isn't really a chip amp (in the typical sense) and I don't know if anyone here has even used one. (LM4651/2 is that national Class D amp)
The LM4780 should work well, as long as you can work with all the little pins. If you don't want to make a PCB then I'd suggest a pair of LM 3886's or LM3875's.
Either one will get you in the 160W range (parallel into 4 ohms) with a 30Vac power supply.
As long as your transformer has 22Vac or higher secondaries you will be able to get over 100w.
  Reply With Quote
Old 17th June 2004, 05:03 PM   #3
troystg is offline troystg  United States
diyAudio Member
troystg's Avatar
Join Date: Apr 2004
Location: In a dream... Please don't wake me.

Steve @ Apex.jr has this amp which is 25x2 into 8 Ohms.

But what is intresting about it is that it has 2 sets of RCA's AND a mic input.


Also, PE is currently running a sale on their in spkr PA amp for $119.

I am debating the purchase of one myself.




  Reply With Quote
Old 17th June 2004, 05:33 PM   #4
clemon is offline clemon  Canada
diyAudio Member
Join Date: Jun 2004
Location: Kitchener, Ontario CANADA
Thanks guys. I'll download the specs on the 3886/3875 chips and have a look-see.

I'll also be checking out the mic/line in arrangements for the apexjr.

Thanks also for the power supply info. I'm still a bit hazy on the claculations required to come up with a good psu, so thanks for the numbers!
  Reply With Quote


Best Chip amp for powered PA speaker?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
My TL/Bi-Amped Powered Speaker Project Nedrex Multi-Way 14 18th February 2009 02:08 AM
gemini GX-350 Powered Speaker JDogHerman Solid State 4 28th January 2008 10:20 PM
Constuction Help - Booming powered speaker kurtbauer Multi-Way 18 13th July 2007 10:43 PM
Suggestions for a stepup chip for battery powered headphone amp (from OPA134) anyone? Morse Headphone Systems 8 24th December 2004 04:50 PM
battery powered low power speaker amp fezz Chip Amps 10 25th October 2003 01:27 PM

New To Site? Need Help?

All times are GMT. The time now is 09:22 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio