Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 4th June 2009, 09:37 AM   #341
diyAudio Member
 
Join Date: May 2009
thanks, for the help. so you think the tripath chip is now broken? i used 12V lead battery. adding a new output inductor with higher capacitance wont repair it anymore?
  Reply With Quote
Old 4th June 2009, 09:44 AM   #342
col is offline col  Australia
diyAudio Member
 
col's Avatar
 
Join Date: Feb 2008
Location: Melbourne, Victoria, Australia
12v lead battery? batteries just charged can have voltage up around 14v. Do you have a multimeter? you should measure the voltage. I don't recommend connecting anything over 13.5v.

The constant ticking is the amp trying to reset itself. If you leave it like that it will burn out the chip. If you remove the zener, the little glass orange and black diode near the chip. It will stop the amp resetting. Then you need to work out which inductor is shorted. Follow Mike's directions:

"Try removing the zener diode between pin 18 (fault pin) and pin 11 (I think), and see if you still get ticking.

With the zener gone, try connecting an LED and 2k resistor between pin 18 (fault pin) and GND and see if the LED lights up."

col.
__________________
http://www.minirig.org.au
  Reply With Quote
Old 4th June 2009, 09:46 AM   #343
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
Quote:
Originally posted by col
I might take out the zener too! Mike, did you replace it with a wire link or just remove it?

col.
I removed it and left it open circuit, it's not needed at all and I'm not sure why they put it in! Take a look at the TA2020 datasheet for the nitty gritty, basically the ticking sound is the amp trying to start up despite there being a problem, and the ticking can lead to a broken TA2020.
Quote:
Originally posted by whelibob
thanks, for the help. so you think the tripath chip is now broken? i used 12V lead battery. adding a new output inductor with higher capacitance wont repair it anymore?
I could be the TA2020, it could be a short on the outputs where the inductors and diodes are, I'd remove the zener and wire up the fault LED if you've modded it already, otherwise I'd send it back.
  Reply With Quote
Old 4th June 2009, 09:48 AM   #344
diyAudio Member
 
Join Date: May 2009
yes i measured the batteryvoltage, it was 12.5V. does anyone have the datasheet link, cant find it at the moment.
cheers
  Reply With Quote
Old 4th June 2009, 10:21 AM   #345
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
Quote:
Originally posted by whelibob
yes i measured the batteryvoltage, it was 12.5V. does anyone have the datasheet link, cant find it at the moment.
cheers

www.kafka.elektroda.eu/pdf/tripath/TA2020.pdf
  Reply With Quote
Old 4th June 2009, 10:26 AM   #346
col is offline col  Australia
diyAudio Member
 
col's Avatar
 
Join Date: Feb 2008
Location: Melbourne, Victoria, Australia
Mike, which side of the zener is pin 17 and which is 18? I think I might wire a fault led in and glue it to the front.

col.
__________________
http://www.minirig.org.au
  Reply With Quote
Old 4th June 2009, 10:38 AM   #347
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
Quote:
Originally posted by col
Mike, which side of the zener is pin 17 and which is 18? I think I might wire a fault led in and glue it to the front.

col.
The zener goes from pin 11 to pin 18, if you can post a close up of the chip I can highlight it in photoshop for you.

i'll try and get a photo of mine with no zener, but I've only got a camera-phone so it may not work too well...
  Reply With Quote
Old 4th June 2009, 10:56 AM   #348
col is offline col  Australia
diyAudio Member
 
col's Avatar
 
Join Date: Feb 2008
Location: Melbourne, Victoria, Australia
Default replacement inductors

I'm sure you can get these in the UK:

http://australia.rs-online.com/web/s...duct&R=2335134

they would be much better than the originals.

col.
__________________
http://www.minirig.org.au
  Reply With Quote
Old 4th June 2009, 12:23 PM   #349
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
Default Re: replacement inductors

Quote:
Originally posted by col
I'm sure you can get these in the UK:

http://australia.rs-online.com/web/s...duct&R=2335134

they would be much better than the originals.

col.
Yep there is a depot pretty near me, so I'll pick up a few next time I'm there, thanks.

I'm now trying to fit a nice allen & bradley pot to the amp as I managed to break the 100k volume pot while trying to remove the front...
  Reply With Quote
Old 4th June 2009, 12:28 PM   #350
col is offline col  Australia
diyAudio Member
 
col's Avatar
 
Join Date: Feb 2008
Location: Melbourne, Victoria, Australia
just removed the zener and put a 2k resistor with led on the No18 pin. drilled a hole in the front between the tone controls to mount. So I now have a fault led

col.
__________________
http://www.minirig.org.au
  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
New ta2020 pcb'S ArjenShenzhen Vendor's Bazaar 98 14th November 2012 11:39 AM
Ta2020 Bengali Class D 0 29th September 2007 05:28 AM
Eb-ta2020 opentop Class D 16 30th May 2005 07:42 AM


New To Site? Need Help?

All times are GMT. The time now is 02:14 AM.


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