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Old 6th May 2012, 06:23 PM   #1991
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I thought this one had been nailed a long time ago!

Both orientations result in a forward biased diode, so are equivlent.

The only difference, (not relevant here) is if the polarity is reversed; the top configuration sees a BE reverse zener of about 6.2V, the bottom one whatever VCBo is, which could be high.
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Old 7th May 2012, 09:50 AM   #1992
AndrewT is offline AndrewT  Scotland
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Cliff,
what's wrong?

Your 896 by 896 pixel >100kB pic is perfectly visible/legible at the thumbnail resolution of 150 by 150 pixel and just 3.7kB

I do like your explanation of the difference in reverse orientation. 4 ways to connect and 4 different results.
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Old 7th May 2012, 10:04 AM   #1993
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Quote:
Originally Posted by AndrewT View Post
Cliff,
what's wrong?

Your 896 by 896 pixel >100kB pic is perfectly visible/legible at the thumbnail resolution of 150 by 150 pixel and just 3.7kB

I do like your explanation of the difference in reverse orientation. 4 ways to connect and 4 different results.
I must be missing something?

Why is the resolution a problem for you? Are you still on dial-up 300baud?

"4 ways ..." Not sure what you are getting at! I was trying to show that if the PCB had the transistor inverted it makes no difference since it is used as a forward diode in the CCS tail. So ONE result, not 4.
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Old 7th May 2012, 10:09 AM   #1994
AndrewT is offline AndrewT  Scotland
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The reverse polarity version that you describe has either Zener type action, or Vcbo.
That is two different results.
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Old 7th May 2012, 10:22 AM   #1995
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The reverse polarity version that you describe has either Zener type action, or Vcbo.
That is two different results.
Are you feeling grumpy this morning, Andrew?

I mentioned the difference in Vz but pointed out that IN THIS CIRCUIT it is not an issue!
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Old 7th May 2012, 11:32 AM   #1996
AndrewT is offline AndrewT  Scotland
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I didn't say it was an issue.
I noted your comments and the fact you were drawing our attention to how the device operates with different orientation and different polarity.

I had not thought that through, as thoroughly, as you have.

Although I didn't use the words. I was in effect thanking you for pointing out the 4 variations rather than just leaving us ignorant of the implications.
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Old 7th May 2012, 12:29 PM   #1997
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I'm still waiting for someone to post the PCB designs so that us TRUE DIYers can have a go at building the project.
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Old 15th May 2012, 06:19 AM   #1998
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Default Golmund clone

Box-transformer
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Old 15th May 2012, 07:34 AM   #1999
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χαλια ... χαλια ...χαλι μαυρο....

( that was cra**y work ... but in plain Greek )

Nick the metal work is a masterpiece and i expect it when painted to look marvelous only i wonder how much of this tank made box will add anything to the sound of your amplifier ....


Your case ( and others also ) should be a subject to the NVA amplifiers article which in a few words said that steel boxes are no good for audio amps , aluminum boxes sound terrible , so they ended up with a plastic box but without screws since screws effect the sound of amp for the worst

Read the article ...it might change your aspect of life ....
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Old 15th May 2012, 08:31 AM   #2000
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as Nick is preparing to post the NVA article regarding the procedures and topology of the casing let me remind you that the Nva 80 is made around TIP 142 147 .....

If anyone else is interested in some more jokes ....please post here ...

Happy regards
sakis
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