One of my OPA541AP short without knowing why

5150ed · 13th September 2006, 03:58 PM

One of my OPA541AP short without knowing what is the reason.

I am using 100mf Blackgate N with 1000mf Balckgate Standard and haveing very wonderful result however, I want to try only 100mf Blackgate N which is said to have best mid and high frequency.

So I remove the 1000mf standard, without touching any others parts at all.

But when I turn on my amp there is a lound noise from one of my speaker and noise from the other side.

So I check both chanel, nothing wrong. I did try again, same thing happen.

Then I connect the 1000mf standard back but one of my chip is short resulted in 29V DC offset at the speaker terminal.

.

The worst thing is I still do not know why???

Nordic · 13th September 2006, 05:06 PM

My guess was it formed part of an RC network, and you basicaly changed the cutoff frequency for your amp to the point where it made the chip oscillate to death.

100db · 22nd September 2006, 02:50 PM

My friend, you may still lucky enough.
Check your grounding, power and signal ground may loosen or separate when you remove the BG

I've a similar symptom when I forgot to connect power gnd. to signal gnd.

13th September 2006, 03:58 PM	#1
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	One of my OPA541AP short without knowing why One of my OPA541AP short without knowing what is the reason. I am using 100mf Blackgate N with 1000mf Balckgate Standard and haveing very wonderful result however, I want to try only 100mf Blackgate N which is said to have best mid and high frequency. So I remove the 1000mf standard, without touching any others parts at all. But when I turn on my amp there is a lound noise from one of my speaker and noise from the other side. So I check both chanel, nothing wrong. I did try again, same thing happen. Then I connect the 1000mf standard back but one of my chip is short resulted in 29V DC offset at the speaker terminal. . The worst thing is I still do not know why???

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13th September 2006, 05:06 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	My guess was it formed part of an RC network, and you basicaly changed the cutoff frequency for your amp to the point where it made the chip oscillate to death.

22nd September 2006, 02:50 PM	#3
100db diyAudio Member Join Date: Dec 2005 Location: Bangkok, Thailand	My friend, you may still lucky enough. Check your grounding, power and signal ground may loosen or separate when you remove the BG I've a similar symptom when I forgot to connect power gnd. to signal gnd.

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