Tda7265 - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

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
Reply
 
Thread Tools Search this Thread
Old 2nd March 2010, 02:19 PM   #11
diyAudio Member
 
Join Date: May 2008
"Very dangeourous...

Both smps have the minus connected to earth.
So the negative side of your power supply will be
in short circuit to ground , unless you cut the negative supply
earth wire."

Our SMPS do NOT have negative connected to the common on the input. they are completely isolated.

I thought I said this in a previous post?
  Reply With Quote
Old 2nd March 2010, 03:00 PM   #12
sexya is offline sexya  India
diyAudio Member
 
Join Date: Jun 2007
Location: Bombay/India
Send a message via MSN to sexya Send a message via Yahoo to sexya
Quote:
Originally Posted by pra3718 View Post
Sexya,

Are you sure ? because tda7294 does not sound if I keep mute/standby pin floating/not connected.

Did you try for tda7265 bridge ?
Pra---- i m currently using it in that way , the structure of the TDA7294/96/95/93 different from TDA7265, and i m using it in a stereo config not bridge mode, coz i need all the protection coz when you bridge the 7265 ,you will get 50 at 8 ohm with 16 - 0 -16 /4.5 amp supply but your proctection circuits will be dissabled,

and ihave gone to the full volume using my laptop ACER4720z running on vista premium, and also connected N78 phone directly ot the amp without any problems or hiss, its a quite stable and decent, if you make your pcb properly , Altec Lansing probly wouldnt use it in its 2.1 , if it was bad
Attached Images
File Type: jpg TDA7265COMPOSITE.jpg (32.8 KB, 320 views)

Last edited by sexya; 2nd March 2010 at 03:04 PM.
  Reply With Quote
Old 10th March 2010, 01:13 PM   #13
diyAudio Member
 
Join Date: May 2008
Ok So. I'm a little confused over the mute pin. The datasheet shows specs that are weird to me.

If i'm understanding this right, if i am running the chip off of 19V +- and I hook +19V to the mute pin the chip will go into standby? But If i give it +12 volts it will mute it?

I want to hook up a standby switch for convenience. I am assuming zero power to the mute pin "floating" means the chip never mutes and is always on?
  Reply With Quote
Old 10th March 2010, 03:01 PM   #14
sexya is offline sexya  India
diyAudio Member
 
Join Date: Jun 2007
Location: Bombay/India
Send a message via MSN to sexya Send a message via Yahoo to sexya
Quote:
Originally Posted by thetube0a3 View Post
Ok So. I'm a little confused over the mute pin. The datasheet shows specs that are weird to me.

If i'm understanding this right, if i am running the chip off of 19V +- and I hook +19V to the mute pin the chip will go into standby? But If i give it +12 volts it will mute it?

I want to hook up a standby switch for convenience. I am assuming zero power to the mute pin "floating" means the chip never mutes and is always on?
hey mannnnn

use the layout i posted you amp will work fine, else give it +19volts through a switch - so when u put it on,,, then its 19volts if its off that pin goes floating,,,
simple right



enjoy your
amp its a simple stable chip and dont use it with out the gain resistors
  Reply With Quote
Old 10th March 2010, 03:29 PM   #15
diyAudio Member
 
Join Date: May 2008
sexya : no not simple

Do I want the mute pin hot when the amp is on, or in "standby" ? I want the standby option to work.
  Reply With Quote
Old 10th March 2010, 06:40 PM   #16
diyAudio Member
 
Join Date: May 2008
When the mute pin is hot, the amp is in standby. You need to bring the mute pin >=2,5 V below the positive rail to wake it from standby and >=6 V below the positive rail to actually make it play.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 10th March 2010, 07:07 PM   #17
diyAudio Member
 
Join Date: May 2008
Pacfic : Ah, So I did understand the datasheet correctly.
  Reply With Quote
Old 31st March 2010, 09:07 PM   #18
diyAudio Member
 
Join Date: May 2008
Good news, amp is almost complete. Will be powering it up tonight via the two 19V SMPS desktop supplies.


I'm hoping I won't end up with noise from the supplies :\
  Reply With Quote
Old 1st April 2010, 12:17 PM   #19
diyAudio Member
 
Join Date: May 2008
Click the image to open in full size.

first attempt amp did not work. second attempt after messing with the mute circuit amp worked but had 3V dc on the outputs. Third attempt after realizing my signal ground was not connected to my power ground, I now have virtually no DC offset, standby\on works and the amp sounds great.

I did not hook the scope up yet but I do not hear any noise from the dual switching supplies.

The picture shows wires and whatnot I just slapped together for testing. It will be much neater once assembled in an enclosure. Amp was built for around $10 with parts I had laying around and a PCB from a friend.

So far, the TDA-7265 seems to have some muscle, at least for its size. Its certainly not what I expected, especially for $10
  Reply With Quote
Old 2nd April 2010, 05:11 PM   #20
aditya is offline aditya  India
diyAudio Member
 
Join Date: Mar 2010
Location: Bombay, India
Send a message via MSN to aditya Send a message via Yahoo to aditya
how is the audio, could you share the design of PCB, and how is sound like,
i kno its a personal choice question i asked above ie how it sounds,,
  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
TDA7265 Humming sexya Chip Amps 6 10th February 2010 09:49 AM
help regarding tda7265 mute pin SHYAM078 Chip Amps 6 30th January 2010 03:25 PM
Tda7265 + tda7439 sexya Chip Amps 9 24th October 2009 02:49 PM


New To Site? Need Help?

All times are GMT. The time now is 09:39 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2