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

TDA 2040/LM3876 Amplifier
TDA 2040/LM3876 Amplifier
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 April 2008, 09:57 PM   #1
madmodder is offline madmodder  United Kingdom
diyAudio Member
Join Date: Mar 2008
Default TDA 2040/LM3876 Amplifier

Hi Everyone.
This is my first post in diyAudio

OK a number of years ago I was given three B&O tv's and managed to fix 2 of them and sold them both. I scrapped the third, taking the audio amp section out first
Fast forward 10 years and one of the TV's only just failed! So I took the Amp out of that too!
Now, why you ask?
Well the audio amps are based on TDA2040 (sigle supply version)
I going to make either a bi-amp setup or use them bridged to drive my B&O CX50's (5 at a bootfair ) along with the LM3876 to drive a small sub.
This is all being done on a shoestring budget and is taking ages!
The amp will also have Digital input (CS8416\TDA1545 with reclock)
I used eagle to make the 2040's and the heatsinks are old CPU coolers
The case is going to be difficult and I'm looking for inspiration but I reckon wood is going to be the way forward (so my better half likes the way they look)

Just thought I'd share my project with you all...
  Reply With Quote
Old 6th January 2011, 10:03 PM   #2
simply14prem is offline simply14prem  Switzerland
diyAudio Member
Join Date: Jan 2011
Default TDA 2040 ,help.

Just as a hobby I have constructing a TDA 2040 amp with split power supply .Im using 20-0 -20 transformer ,Im getting +15v,-15,But Im not getting any sound yet .Do i need a pre amp ?I want to connect to DTH {sattelite reciever}audio output .Thank u
  Reply With Quote
Old 7th January 2011, 09:51 AM   #3
pra3718 is offline pra3718  India
diyAudio Member
Join Date: Jan 2009
Im using 20-0 -20 transformer ,Im getting +15v,-15,
you mean you are using 20-0-20 transformer and you are getting 15VDC (+/-) then your calculation is wrong.
  Reply With Quote
Old 7th January 2011, 10:46 AM   #4
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
or he doesn't know how to set and read his DVM.

~15Vac (open circuit) would give ~20Vdc (open circuit) after rectifying and smoothing.
regards Andrew T.
  Reply With Quote
Old 7th January 2011, 04:48 PM   #5
pacificblue is offline pacificblue  Germany
diyAudio Member
Join Date: May 2008
Originally Posted by madmodder View Post
The case is going to be difficult and I'm looking for inspiration but I reckon wood is going to be the way forward
You can always make fine looking amps with wood. Some people even swear that amps in wooden enclosures sound better. I have my doubt about that, because a wooden enclosure has no shielding effect agains EMI, but that is a different story.

I have always thought to give modelling compound a try for a case. Here in Germany they sell polymer clay by the name of Fimo. It gives a clean finish, is available in many colours, leaves a lot of freedom to decide on the shape and should be easy to drill. It will however take a few attempts until you get the dimensions right, because it shrinks during the hardening process. There are version that harden after 24 hours contact with air, others need to be hardened at 110 C in the oven and some can even be hardened in a microwave oven. Never got around to try it myself, though.
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote


TDA 2040/LM3876 AmplifierHide 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
TA 2040 where is it available? in India? diysmartdeep21 Chip Amps 5 11th November 2014 07:21 AM
Schematic Tandberg Tr 2040 ericb Vendor's Bazaar 1 2nd January 2011 06:02 PM
Tda2030/2040 Pcb d3imlay Chip Amps 1 1st January 2008 06:34 PM
Help with a LM3876 amp! (nOOb) Fizx Chip Amps 3 24th June 2005 07:22 PM
Lm3876 bobossa Chip Amps 1 1st March 2005 04:18 PM

New To Site? Need Help?

All times are GMT. The time now is 07:16 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