LM1876 power amplifier - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 3rd February 2010, 11:12 PM   #1
JozzaG is offline JozzaG  Australia
diyAudio Member
Join Date: Feb 2010
Blog Entries: 1
Default LM1876 power amplifier

im new to this amp building thing and im having difficulty.
ive bought a few parts and im just having difficulty with the power supply, ive got a 240V 50Hz input to 24V AC max 3A output transformer, however it has only 2 leads and is not centre tapped like i orignally planned or was told. its model is the M2158L transformer and i was looking for some help on how to wire it up and use it in my amplifier.

i have also got a bridge rectifier and most necessary parts for the power supply im just stumped by the transformer as i got my power supply drawings from another persons original schematics
  Reply With Quote
Old 3rd February 2010, 11:55 PM   #2
diyAudio Moderator Emeritus
Iain McNeill's Avatar
Join Date: Oct 2007
Location: Santa Cruz, California
Sorry, but you got the wrong transformer. This one right?
Altronics - Your One Stop Audio Visual & Electronics Supplier

I think you'll have to chalk this one up to education. Try searching for a 24+24 output. Remember that AC voltages rating is multiplied by 1.414 when you rectify for a 24V winding will produce about 34VDC.

Running the amp single ended with a big cap on the output isn't worth the hassle neither is trying to create a phantom center tap.

The only thing I can think of is to wire it up so that the transformer drives the +ve supply on one half cycle and the -ve supply on the other half cycle. Tie one wire to the center tap and then a single diode from the other wire one to each cap. Half wave rectifier. It'll have a lot of ripple.
  Reply With Quote
Old 4th February 2010, 01:45 AM   #3
JozzaG is offline JozzaG  Australia
diyAudio Member
Join Date: Feb 2010
Blog Entries: 1
Would it be simplier to just scrap the transformer i have an buy a new 18-0-18 toroidal transformer.
Altronics - Your One Stop Audio Visual & Electronics Supplier
my only difficulty then is wiring it because of the very minimal datasheet info on toroidal transformers.

what other uses would the M2158L transformer have i.e other electronics that would use this particular transformer
  Reply With Quote
Old 4th February 2010, 01:23 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
buy the correct transformer for this project. 18+18Vac ~4Aac will be about right for one or two channels into 8ohms.

Put the single secondary into stock for a future project, maybe a headphone amp or an active pre-amp.
regards Andrew T.
Sent from my desktop computer using a keyboard
  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
Need help with my LM1876 amp-project Nenola Chip Amps 97 1st May 2011 02:25 PM
Lm1876 Bone Chip Amps 8 18th February 2011 02:32 PM
Power supply for two LM1876 Nenola Power Supplies 1 22nd March 2008 11:41 AM
my 5.1 mofiled:) lm3886+lm1876 gev Chip Amps 0 30th July 2005 03:25 PM
lm1876 fabpri Chip Amps 4 15th January 2004 12:22 PM

New To Site? Need Help?

All times are GMT. The time now is 10:46 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