LME49810 1200RMS into 8 ohms amp possibility? - diyAudio
 LME49810 1200RMS into 8 ohms amp possibility?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 26th October 2012, 07:05 PM #1 diyAudio Member   Join Date: Aug 2012 LME49810 1200RMS into 8 ohms amp possibility? Is it possible to build a 1200RMS into 8 ohms power amp with lme49810? what are the things to be done to the existing sample schematic from National? one of my friend wanted it for PA purpose but he wanted good class AB..
 26th October 2012, 07:22 PM #2 Electrons are yellow and more is better! diyAudio Member     Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4 I will give you some home work: How many volts can you feed LM49810 with? How many volts do you need for 1200 W into 8 ohm? __________________ /Per-Anders (my first name) or P-A as my friends call me PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
 27th October 2012, 07:03 AM #3 diyAudio Member   Join Date: Aug 2012 200v max for the lme49810 if the output voltage is 100 then we need 12 amps to get 1200watts.. considering v=IR so for voltage of 100 i= 100/8 = 12.5amps.. P=IV makes 12.5 x 100 = 1250watts
 27th October 2012, 07:28 AM #4 Electrons are yellow and more is better! diyAudio Member     Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4 Almost right. 100 V peak is 71 V rms = (71*71)/8 = 625 W! Notice that you should have maybe ±70-80 V max as supply voltage. The difference between 1200 and 625 watts is only 3 dB, mind that. Have you checked that prices for new or used PA amps? They are not particularly expensive. __________________ /Per-Anders (my first name) or P-A as my friends call me PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
 27th October 2012, 11:09 AM #5 diyAudio Member   Join Date: Aug 2012 so how many output transistors is required to get that much of power? can I have more max supply voltage like 100 or more? i am thinking of using this one or build everything from scratch... Connexelectronic if im using two of this modules then can I use them at 2 ohms?
 27th October 2012, 11:12 AM #6 diyAudio Member   Join Date: Apr 2004 Location: Norwich, UK If you really want 1200W RMS, you do not want class AB. At the very least you want Class G. Really you want Class D. You won't be able to build anything as cheap as you can buy it, unless you're recycling parts. edit: No, those modules will not work on 2 ohms, especially if you were driving them bridged. Either protection circuitry would activate, or you would burn them out as each one would see a 1 ohm reactive load. There are not many amps that will drive such low loads. Last edited by jaycee; 27th October 2012 at 11:19 AM.
 27th October 2012, 11:31 AM #7 Electrons are yellow and more is better! diyAudio Member     Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4 Maybe you should consider 2500 watts module? http://www.hypex.nl/docs/UcD2kOEM_datasheet.pdf __________________ /Per-Anders (my first name) or P-A as my friends call me PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
 27th October 2012, 01:15 PM #8 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders Typical of the many questions asked by R. He has not got a clue and despite many Members coming in with assistance, R appears to have learned nothing. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
Electrons are yellow and more is better!
diyAudio Member

Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Quote:
 Originally Posted by rhythmsandy i am thinking of using this one or build everything from scratch... Connexelectronic
I work with electronics since decades back. I think that it requires high competence to design a good 1200 W 8 ohm amp. This is nothing I would do with my left hand exactly.

My advice is to look for a couple of used PA amps.
__________________
/Per-Anders (my first name) or P-A as my friends call me

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post McIntosh Man Multi-Way 29 11th June 2010 05:36 PM evangelion1999 Chip Amps 20 25th April 2008 03:51 PM eddi0 Subwoofers 24 21st October 2006 03:29 PM

 New To Site? Need Help?

All times are GMT. The time now is 03:06 PM.