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Old 22nd March 2003, 02:47 AM   #1
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Default Transistor Break-In Circuit

How can I break-in a new transistor before I install it to an amp?

Can anyone please post a circuit that I can build and some guidelines to follow.

My country (Philippines) is plagued with counterfeit transistors and that is why I desperately need to break-in the transistors that I will buy. I don't want to end up blowing my speakers.

Jojo
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Old 22nd March 2003, 05:41 AM   #2
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Default Re: Transistor Break-In Circuit

Quote:
Originally posted by JojoD818
How can I break-in a new transistor before I install it to an amp?

Can anyone please post a circuit that I can build and some guidelines to follow.

My country (Philippines) is plagued with counterfeit transistors and that is why I desperately need to break-in the transistors that I will buy. I don't want to end up blowing my speakers.
Well, if you're just worried about blowing your speakers, here ya go:

<center>
<img src="http://www.q-audio.com/images/load.jpg">
</center>

Guaranteed not to so much as give your speakers a woody let alone blow 'em.

se
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Old 22nd March 2003, 09:45 AM   #3
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Steve...

Wow! Is that, like, patented??



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Old 22nd March 2003, 01:18 PM   #4
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Steve,

I was hoping to break-in the transistor before I install it to my amp to avoid any possible mishaps. Is it possible?

Jojo
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Old 22nd March 2003, 04:33 PM   #5
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Default Re: Torture test...

Quote:
Originally posted by JojoD818
I was hoping to break-in the transistor before I install it to my amp to avoid any possible mishaps. Is it possible?
Well, you could build a duplicate amp circuit just for testing if you want to see if a particular transistor will work in that particular circuit.

If you want something a bit more geralized, check out Rod Elliot's transistor tester at:

<a href="http://sound.westhost.com/project31.htm">http://sound.westhost.com/project31.htm</a>

se
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Old 22nd March 2003, 04:35 PM   #6
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Quote:
Originally posted by EchoWars
Steve...

Wow! Is that, like, patented??
Hehehe. The really sad thing is, I probably COULD obtain a patent for it given what the patent office has been rubber stamping these days.

se
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Old 22nd March 2003, 04:41 PM   #7
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On page 3 of this link http://www.passdiy.com/pdf/a75p2.pdf there is a circuit for mosfet testing. You may built something similar to break in the individual transistors.
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Old 23rd March 2003, 01:44 AM   #8
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Default Transistor Tester

Steve,

Thanks for the link. I'll study it first though.

Jojo
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Old 23rd March 2003, 04:54 AM   #9
BrianL is offline BrianL  United States
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Jojo,

What you want to do is to verify that the transistors work
as advertised? Several of these circuits should work
for small signal transistors. A transistor curve tracer
would be REALLY nice for your checking.

Also, I'd figure some way to run some reasonable amount of
power on the power transistors as it seems that many
counterfeit power transistors have very tiny die. Thus
the only way to discover this is to set up the transistor
to dissipate a reasonable amount of power -- something
that the genuine transistor should be able to handle
but will fry the imposter.

One could also x-ray the transistors to see what the inside
looks like.

Many imposters also have package molding and/or markings
that don't look like the genuine article. Manufacturers
usually have their standard marking drawings somewhere
on your web sites. Comparison of your parts to the drawings
should be instructive. You might also check your devices
against known genuine transistors or pictures of the
genuine article.
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Old 23rd March 2003, 04:58 PM   #10
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Default exactly...

Brian,

That is exactly what I had in mind. You see, if an original transistor can handle the power, then a counterfeit surely won't since it is loosely spec'd to keep down it's cost.

In my country, original and counterfeit components are almost the same price! Even the most reliable suppliers here sometimes sell fake/counterfeit parts.

If I burn a circuit, for example an amp, I would be happy to admit it's my fault/error and not because of a whimpy component. I'd rather subject a power transistor for burn-in than to expose the whole project to danger.

If you do have a simple circuit that can burn-in a power transistor, please let me know.

Thanks,
Jojo
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