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Old 8th April 2016, 01:40 PM   #1
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Default B1 has died

How odd, my B1 has died, both channels at the same time.

To recollect, this build uses the PSU (SALAS Shunt Reg) from the DCB1 but uses a clone of the original B1 for the buffer.

It was working flawlessly and had been for several years.

I've just completed a Pearl 2 project which works perfectly directly driving my Aleph 4 - so no problems there.

I decided to add the B1 as a volume control and it's died.

I've tried the original CD source and the B1 is definitely the culprit.

I just can't believe that it's coincidence that the B1 has been killed by the Pearl 2.

This post isn't about "What is wrong", it's more about "Why"

Last edited by KatieandDad; 8th April 2016 at 01:50 PM.
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Old 8th April 2016, 02:45 PM   #2
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If you know what happened I'm sure you also can figure out why. It's harder the other way around.
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Old 8th April 2016, 03:08 PM   #3
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Everything is AC coupled so it just doesn't make any sense.
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Old 8th April 2016, 04:01 PM   #4
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Do you know if it's the DCB1 PS or the B1 circuit?
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Old 8th April 2016, 05:33 PM   #5
Electrons are yellow and more is better!
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So why did it break? Have you done any fault tracing?
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Old 8th April 2016, 05:35 PM   #6
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Also, pics.
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Old 8th April 2016, 06:21 PM   #7
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It's quite possible to blow the Gates with a spike.

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Old 8th April 2016, 07:26 PM   #8
Electrons are yellow and more is better!
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Just for reference, a mosfet will be instantly destroyed of you apply 28 V gate voltage. For JFET's I have no personal experience to destroy.

The reason why I know about mosfets is that datasheets only say max ± 20 V but when do I break the fet and what kind of failures do I get? More than 26 V = no mercy.
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Old 8th April 2016, 07:31 PM   #9
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Quote:
Originally Posted by peranders View Post
Just for reference, a mosfet will be instantly destroyed of you apply 28 V gate voltage. For JFET's I have no personal experience to destroy.

The reason why I know about mosfets is that datasheets only say max ± 20 V but when do I break the fet and what kind of failures do I get? More than 26 V = no mercy.
Yeah, and at least one member has encountered a large turn-on thump:

Pearl Two

Perhaps the OP can try measuring and see if that might be an issue.

Dennis
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Old 9th April 2016, 04:06 PM   #10
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I haven't had the opportunity yet to see where the problem might be.
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