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

lm4780 Dual mono kit from audiosector?
lm4780 Dual mono kit from audiosector?
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 March 2006, 07:39 PM   #1
Nickzz is offline Nickzz  Sweden
diyAudio Member
Join Date: Mar 2006
Location: Mölndal
Default lm4780 Dual mono kit from audiosector?

How many volts can i put in to the lm4780?
I found a transformer with 400VA and 42volts does it works?

If you built this kit your self!
please put up some pictures!
  Reply With Quote
Old 9th March 2006, 08:04 PM   #2
Greg Erskine is offline Greg Erskine  Australia
diyAudio Member
Greg Erskine's Avatar
Join Date: Jan 2002
Location: Sydney/Australia
lm4780 Dual mono kit from audiosector?
Hi Nickzz,

It is really worthwhile having a look at the LM4780 datasheet, one can be found here: http://www.datasheet4u.com/html/L/M/...uctor.pdf.html

It says maximum voltage is 84V i.e. 42-0-42 VDC.

If your transformer is 42-0-42 VAC then after rectification through a bridge the DC voltage ends up approx. 42 x 1.4 = 59 ouch.

If you need to use this transformer then you can't use a bridge rectifier.

Greg Erskine
  Reply With Quote
Old 10th March 2006, 01:32 AM   #3
dfdye is offline dfdye  United States
diyAudio Member
dfdye's Avatar
Join Date: Dec 2005
Location: USA
If the transformer is 42VCT, then you can use the +/-21V and be right in the sweet spot with ~+/-30V.

Mmmmm. . . . . . Sweet. . . . . .

If it is just +42V, then you will have a little more work to do, and will probably either need to use a different transformer (unless you want to do some surgery on it!)

I think we just need a little more info on the transformer to really say if it will be useful.
  Reply With Quote


lm4780 Dual mono kit from audiosector?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
43v SMPS for dual bridge mono LM4780 juan_caliente Chip Amps 45 2nd May 2010 10:37 PM
LM4780 dual mono -- boards jackinnj Swap Meet 1 1st October 2008 12:44 AM
AudioSector LM3875 dual mono classic kit. gychang Swap Meet 2 2nd August 2008 01:28 PM
AudioSector LM3875 dual mono premium kit. nodiak Swap Meet 1 16th October 2007 05:38 PM
AudioSector LM4780 Dual-Mono - questions/build log gongzero Chip Amps 3 22nd October 2006 02:43 PM

New To Site? Need Help?

All times are GMT. The time now is 03:02 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