TA30320 & SMPS500R - help needed - diyAudio
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 14th November 2010, 04:16 PM   #1
diyAudio Member
 
Join Date: Sep 2010
Default TA30320 & SMPS500R - help needed

I got a TA3020 & SMPS500R from Connex. I connected the SMPS500R to the TA3020 Amp after removing the Bridge Rectifier and connecting Pin 1 to 2 and Pin 3 to 4 as in the instructions. The SMPS500R was outputting at +/- 60V DC.

When I switched on, there was a small spark. I checked the speaker outs with a multimeter & there was about 107 Volts AC relative to Earth on the speaker outs (this seems a pretty high & dangerous voltage). The TA3020 did not work at all. Hence I removed the heat shield and noticed that the Resistor R14 seem to be burnt. Further, there is now a short between AC1 and AC2 on the TA3020 power supply pins. Thus the SMPS500R goes into self-protection mode when connected to the TA3020.

The whole thing is assembled on a wooden board, no metal chassis. Is there something I'm doing wrong in the connections ? Any idea what has gone wrong with the TA3020 Amp ?

regards,
  Reply With Quote
Old 14th November 2010, 04:36 PM   #2
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Check the output FETs; they are most likey blown. The TA3020 might be a goner as well.
  Reply With Quote
Old 14th November 2010, 04:56 PM   #3
diyAudio Member
 
Join Date: Sep 2010
Quote:
Originally Posted by theAnonymous1 View Post
Check the output FETs; they are most likey blown. The TA3020 might be a goner as well.
should I desolder the MOSFETs to test them ? btw, is a high AC voltage normal on speaker outs ?
  Reply With Quote
Old 14th November 2010, 10:53 PM   #4
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by abbymat2 View Post
should I desolder the MOSFETs to test them ? btw, is a high AC voltage normal on speaker outs ?
MOSFETs usually go short D-S.
You should be bale to check this in circuit.
__________________
PCBCAD50 software. http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 15th November 2010, 05:12 AM   #5
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
and post picture of your setup, you could do something wrong... for next time, test smps first, then connect 1 amp to it and check and 3x recheck if your you wired everything ok and/or as here or seller, before you turn things on
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 15th November 2010, 06:00 AM   #6
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Please post some pictures, maybe can help to find the problem.
the SMPS500R has an Earth connection and is recommended to be connected for safety and low EMI. furthermore, there is a 10R resistor connected between the Earth and secondary GND which bring the GND potential close to the earh potential, and avoid GND loops. if the earth connection is not used, there is a very low leakage current < 1mA due to the Y capacitors and that's why you get ~100V AC when you measure the voltage between any point of the amp and earth. The primary side GND is completly isolated from the Earth or secondary GND, if it won't be, when you measure the voltage, will show you 220V AC or about 160V if you measure on DC domain. this is a dangerous situation, which must be avoided by keeping clear any primary section of the smps from secondary side, housing or any other wire which can touch the primary side. also, the SMPS must be earthed for safe operation.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS

Last edited by Cristi; 15th November 2010 at 06:03 AM.
  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
Goodmans Audioms &amp; Adastra/Celestions. info needed! vinyvamos Multi-Way 13 12th April 2012 09:18 AM
Bridge &amp; Parallel 4 x LM4780 - Basic wiring diagram needed GAH Chip Amps 13 12th August 2009 01:37 PM
Scan Speak 8530K00&amp;9700 needed kessizubac Multi-Way 1 31st December 2004 09:31 AM
Newbie Amp & Enclosure Advice Needed Ron Subwoofers 33 6th February 2002 09:20 PM


New To Site? Need Help?

All times are GMT. The time now is 04:34 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