Problems with piggy backed TDA1541 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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 21st May 2002, 02:33 PM   #1
diyAudio Member
 
Join Date: Apr 2002
Default Problems with piggy backed TDA1541

Hi All,
I have piggybacked two TDA1541 DAcs (one an A1, the other an S1). All pins are connected to each other, except for the pins requiring the connection of a 680pF cap. Both DACs have their own 680pF cap (the original DACs 680pF cap is surface mounted, while the added DACs 680pF cap is a leaded polyester cap).

Problem: After the CD player is switched off, the DAC will take up to 20 minutes to produce sound from the left channel, while teh right channel during this period is completely distorted. After up to 20 minutes have passed, a popping sound occurs on the right speaker and everything is fine, with great sounding music!

The powersupply is TL431 based, preceded by LM317/337 regulators for both +_5 and -15V. Any ideas on what can be causing this problem?

Many thanks
Ryan
  Reply With Quote
Old 23rd May 2002, 12:56 PM   #2
diyAudio Member
 
Join Date: Apr 2002
Default Problem solved

It appears that teh TL431 to teh -15V line was not able to handle TWO -15V pins. The calcs suggest that it jsut about could, but reality was another story. Put another T431 circuit in and problem is sorted out!
  Reply With Quote
Old 24th May 2002, 07:30 AM   #3
rbroer is offline rbroer  Netherlands
diyAudio Member
 
rbroer's Avatar
 
Join Date: Mar 2002
Location: Netherlands
You could have lowered the current to the 431.
It only dissipates the current that's being shunted, not the current required for the load.
You have to make sure both voltages are the same.
What are your experiences ? Better dynamics with some loss of fine level details ?
  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
Open backed boxes ? Anyone ? norman bates Full Range 37 6th September 2008 02:19 AM
piggy-back op-amps amc32 Car Audio 6 14th July 2008 07:48 AM
TDA1545 possible to piggy back? jnewbold Digital Line Level 17 19th December 2007 04:47 PM
Adhesive backed rubber feet smallangryboy Multi-Way 4 9th April 2005 01:57 PM
Paper-backed vinyl: corners DPW666 Multi-Way 4 23rd January 2003 07:42 PM


New To Site? Need Help?

All times are GMT. The time now is 10:36 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