Polarity Goof Consequences?

MartinC700 · 3rd February 2011, 07:13 PM

All,

In hooking up my IVYIII to compare to the current Legato II, I inadvertently connected the +5.5v supply from the Placid to the Buffalo the wrong way around for a few seconds. As soon as I noticed to LED's on the Buffalo or the Tridents I switched off the power.

In rewiring the correct way all the LED's on the Tridents and the Buffalo power board light up and the DAC works, however, I get the feeling in listening to it that it is not quite as good as before. All the voltages out from the shunt regs seem OK, so the opamps on the shunts are presumably OK but without published circuit diagrams I am not sure if there are any other regulator parts (polarised SMD caps?) that could be damaged by supply reversal.

Would anyone know any way of checking?

I could of course just replace the Tridents and the Buffalo daughter board, but am waiting for a response from Brian or Russ on availability of the DVCC board without the Buffalo.

Any help would be much appreciated.

Regards

Martin

MartinC700 · 3rd February 2011, 11:35 PM

Quick correction, meant to refer to the AVCC module on the Buffalo

tomchr · 4th February 2011, 12:41 AM

Without a schematic to look at, it's difficult to tell for sure. But it's very likely that the ESD structures of the ICs saved them from melt-down. If all the voltages are within spec, I'd say the DAC survived.

I'm guessing any perceived difference in sound quality is due to psychosomatic effects. That's my guess anyway.

~Tom

MartinC700 · 4th February 2011, 12:51 AM

Hi Tom,

Thanks, I'll give it another listen tonight - probably is all in the mind!

Regards

MartinC700 · 6th February 2011, 04:31 PM

Looks like it was either a placebo effect or I hadn't tightened a connection - all appears well now.

Regards

3rd February 2011, 07:13 PM	#1
MartinC700 diyAudio Member Join Date: Oct 2010 Location: San Diego	Polarity Goof Consequences? All, In hooking up my IVYIII to compare to the current Legato II, I inadvertently connected the +5.5v supply from the Placid to the Buffalo the wrong way around for a few seconds. As soon as I noticed to LED's on the Buffalo or the Tridents I switched off the power. In rewiring the correct way all the LED's on the Tridents and the Buffalo power board light up and the DAC works, however, I get the feeling in listening to it that it is not quite as good as before. All the voltages out from the shunt regs seem OK, so the opamps on the shunts are presumably OK but without published circuit diagrams I am not sure if there are any other regulator parts (polarised SMD caps?) that could be damaged by supply reversal. Would anyone know any way of checking? I could of course just replace the Tridents and the Buffalo daughter board, but am waiting for a response from Brian or Russ on availability of the DVCC board without the Buffalo. Any help would be much appreciated. Regards Martin

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
In Bass reflex box (vented)-If I make smaller box than what consequences will I have?	eliaselias_0	Multi-Way	6	3rd January 2011 03:49 PM
Button Batteries - Serious Consequences for Toddlers	cowboy99	Everything Else	0	4th March 2010 08:01 PM
driver polarity	sberube	Multi-Way	3	25th August 2004 11:01 PM
moderator/administrator goof	dice45	Everything Else	28	28th August 2002 01:30 PM
Polarity	Myren	Multi-Way	6	22nd December 2001 01:44 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

3rd February 2011, 11:35 PM	#2
MartinC700 diyAudio Member Join Date: Oct 2010 Location: San Diego	Quick correction, meant to refer to the AVCC module on the Buffalo

4th February 2011, 12:41 AM	#3
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	Without a schematic to look at, it's difficult to tell for sure. But it's very likely that the ESD structures of the ICs saved them from melt-down. If all the voltages are within spec, I'd say the DAC survived. I'm guessing any perceived difference in sound quality is due to psychosomatic effects. That's my guess anyway. ~Tom

4th February 2011, 12:51 AM	#4
MartinC700 diyAudio Member Join Date: Oct 2010 Location: San Diego	Hi Tom, Thanks, I'll give it another listen tonight - probably is all in the mind! Regards

6th February 2011, 04:31 PM	#5
MartinC700 diyAudio Member Join Date: Oct 2010 Location: San Diego	Looks like it was either a placebo effect or I hadn't tightened a connection - all appears well now. Regards

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)