OPA541 blown? - 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 3rd June 2003, 07:18 PM   #1
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
Unhappy OPA541 blown?

i made the bridged and parrelleled circuit last night (at last ) and powered it up with +/-5v, as +/-4v is the lowest the chip will work with, and didnt want to damage anything if i had made a mistke.

powered it up, my 1A power supply overloaded (light came on), so i switched it off, re-checked every connection, all fine. re-power it up, still overload, shut it off again.

leaft the room, and had a cup of coffee. came back in, checked pin layout and circuit diagram of OPA541 and DRV134 (or is it DVR?), anyway, i noticed that i had missed the 'top view' on the OPA541 pinout. so i had connected the +v and -v connections backwards, and, less important, the + and - input backwards. doh!

desoldered all components, and started again. double checked all components, and again powered it up with +/-5v, nothing, no load, no output. i touched the input, no output (on my working gainclone i get buzz if i touch the input pin).

checked the speaker, i had blown it the first time , got a new speaker, conected it, powered it up again, still nothing. i disconceted power and the speaker and check voltages at the output, now +5v on both outputs.

very iritating, could the chips be blown? with +/-5v? i may have accidentally turned the power supply up to +/-15v as when i came to power it up the second time, it was set to this.

thanks for any help, below i have posted a picture of my layout, sorry, it is very quick and messy, i am not on my own computer so i do not have images here.

oops, forgot, view is from below of chip,as i have them mounted on a heatsink and all i can see is the leads.
Attached Images
File Type: gif matthew 1 (diyaudio).gif (5.3 KB, 362 views)
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote
Old 3rd June 2003, 08:42 PM   #2
Synapse is offline Synapse  Canada
diyAudio Member
 
Synapse's Avatar
 
Join Date: Dec 2002
Location: Where snow is plentiful
From my experience the chip is fried.. I too missed the darn "top view" resulting in a dead chip pricy mistake...
__________________
-Synapse
  Reply With Quote
Old 4th June 2003, 08:38 AM   #3
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
is there any other response? is there any way i can check the chips? or should i just order some more?
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote
Old 4th June 2003, 09:55 AM   #4
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
I find that they are quite sensitive to ps mistakes and not only despite all those protection circuits.I must have burned 2-3 OPA 549 mainly from simple mistakes like yours.The other day I was just switching my pre on and off with a low vol and even though there was no thumps on the speakers I managed to burn another opa.Beats me why.Just change them , wire them up correctly and all will be well.No use trying to "pick up the pieces" here.
  Reply With Quote
Old 4th June 2003, 10:28 AM   #5
diyAudio Member
 
Cradle22's Avatar
 
Join Date: Jan 2003
Location: Dortmund, Germany
Default Re: OPA541 blown?

Hi!
Quote:
Originally posted by Matttcattt
i touched the input, no output (on my working gainclone i get buzz if i touch the input pin).
Just btw.: Never touch the input pin (at least with no load connected). It will result in instant oscillations (which may be unhearable). And if you do not have a Zobel connected to output, you can damage the amp permanently (if you have a Zobel, the Zobel resistor will get very hot, probably melt).

I speak of experience, at least with P3A, and R. Elliot confirmed that this is the case with every amplifier which has no decent protection circuitry (and I find all internal protection circuits in ICAmps somewhat lacking, none has really protected me from faults, so far...)

So, be careful...

Bye,

Arndt
__________________
************************
A Sacrifice For Freedom
  Reply With Quote
Old 4th June 2003, 08:18 PM   #6
Synapse is offline Synapse  Canada
diyAudio Member
 
Synapse's Avatar
 
Join Date: Dec 2002
Location: Where snow is plentiful
Quote:
Originally posted by Matttcattt
is there any other response? is there any way i can check the chips? or should i just order some more?

what more is there to say... hmmm... next time read carefully... and don't waste samples...
__________________
-Synapse
  Reply With Quote
Old 4th June 2003, 08:34 PM   #7
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
Default Re: Re: OPA541 blown?

Quote:
Originally posted by Cradle22
Hi!


Just btw.: Never touch the input pin (at least with no load connected). It will result in instant oscillations (which may be unhearable). And if you do not have a Zobel connected to output, you can damage the amp permanently (if you have a Zobel, the Zobel resistor will get very hot, probably melt).

I speak of experience, at least with P3A, and R. Elliot confirmed that this is the case with every amplifier which has no decent protection circuitry (and I find all internal protection circuits in ICAmps somewhat lacking, none has really protected me from faults, so far...)

So, be careful...

Bye,

Arndt

i have no zobel and havemt heard any damage by touching the input, ill stop doing it anyway.

back to soldering, luckily i have 4 more chips to have another try, as i was going to make 2 channels. ill order more for the second and maybe some extra incase i blow these
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  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
opa541 jaudio Swap Meet 3 18th February 2009 01:55 PM
Opa541-548-549 abid_rehan Chip Amps 3 9th August 2004 07:06 AM
opa541 sss Chip Amps 3 6th August 2004 10:27 AM
My very own OPA541 GC MikeF777 Chip Amps 4 9th December 2003 05:24 PM
opa541 pundip Solid State 5 2nd March 2003 06:08 PM


New To Site? Need Help?

All times are GMT. The time now is 02:05 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