2.1 channel amplifier - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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
Reply
 
Thread Tools Search this Thread
Old 22nd December 2013, 07:35 AM   #1
diyAudio Member
 
Join Date: Oct 2013
Exclamation 2.1 channel amplifier

Dear all,
I am from one of the begginers in electeonics hobbysists. I have some knowledge about electronics. I decided to build 2.1 channel amplifier with TDA7377 + LM4558D using schematic given on following site -
Circuit power audio amplifier with TDA7377 2.1 – Stereo + Subwoofer 2x 12 Watts + 37 Watts | Xtronic Free Electronic Circuits and Informations
Now, I have two 10w 4ohm satellite speakers and 50w 4ohm subwoofer. But after assembling circuit sound is anyway not coming. I am using 12v power supply. And usb mp3 player as sound i/p. But there is noise only. Please help me with this circuit. Whether LM4558D requires negative (-12v) power supply??
Please help.....!!!
  Reply With Quote
Old 22nd December 2013, 12:44 PM   #2
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Quote:
Originally Posted by Vaibhav Shinde View Post
....Whether LM4558D requires negative (-12v) power supply??....!
Hi,

The PCB doesn't allow a dual Supply so whats wrong with the shematic is the lack of bias needed to ensure proper Single Supply operation.

b
Attached Images
File Type: jpg 2.1-30-watts-power-amplifier.JPG (121.6 KB, 309 views)
  Reply With Quote
Old 23rd December 2013, 11:08 AM   #3
diyAudio Member
 
Join Date: Oct 2013
Dear Sir,
Thank you so much for helping me. I will make mentioned changes in the circuit & surely let you know the result. Please let me know, what power of speaker should be taken ?? Same as amplifier per channel output , less or more?? I have matched ohm rating... Please suggest for amplifier power & speaker power...!!
  Reply With Quote
Old 23rd December 2013, 01:27 PM   #4
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Quote:
Originally Posted by Vaibhav Shinde View Post
Dear Sir,
Thank you so much for helping me. I will make mentioned changes in the circuit & surely let you know the result. Please let me know, what power of speaker should be taken ?? Same as amplifier per channel output , less or more?? I have matched ohm rating... Please suggest for amplifier power & speaker power...!!
I think your choice of Speakers are quite good compared to the Amplifiers.

A small Headroom of a Power +dBW margin counted from the L+R Amplifiers to the Speakers (Your minimum Headroom:10log(12/10)=~0.8 dBW) is OK for low level listening.
Normally I guess, 6-7 W feed into the Speakers should sound good(~3dBW margin).
Concerning the Sub 50 W rating I think it's more important to look at the Driver x-max that normally limit max input possible Power to a much lower value than what the Driver is rated to. 18.5W feed into the Sub givea a~3dBW margin...

What Drivers(Brand names) are you using in what type of cabinets ,in what internal Box Volumes?

b
  Reply With Quote
Old 30th December 2013, 08:43 AM   #5
diyAudio Member
 
Join Date: Oct 2013
Dear Sir,
You have mentioned about lack of bias in the circuit. But please note , IC1A & IC1B is single 8 pin IC (LM4558) . Similar case is for IC3A & IC3B. But in your provision you have only written IC1A , IC1B & IC3A . Sir, please let me know, whether same is appliable for IC3B also??/ Also please suggest, to which pin of IC1B the biasing circuit is to be connected??
  Reply With Quote
Old 16th April 2015, 03:37 PM   #6
diyAudio Member
 
Join Date: Apr 2015
Bro I have problem in my tda7377 my circuits is based on PDF it running but!!! The problem is when I cranks the volume and give the bass of my circuit the system shutdown and I will re start again i n 12v pls help me
  Reply With Quote

Reply


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 amplifier cabinet for 5.1 Channel Amplifier nalinb80 Swap Meet 0 23rd October 2012 06:52 PM
P channel amplifier Tekko Solid State 3 7th April 2012 12:10 PM
8 Channel Amplifier shzmm Chip Amps 1 4th June 2009 08:16 PM
Yet another N-Channel Amplifier Pelle Solid State 50 10th January 2005 07:48 AM
6-channel Amplifier halvardf Solid State 7 3rd July 2002 02:15 AM


New To Site? Need Help?

All times are GMT. The time now is 07:31 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2