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-   -   NP's first Single-Ended Class A amplifier using BjT's biased by a CCS (http://www.diyaudio.com/forums/pass-labs/185796-nps-first-single-ended-class-amplifier-using-bjts-biased-ccs.html)

tiefbassuebertr 25th March 2011 11:15 PM

NP's first Single-Ended Class A amplifier using BjT's biased by a CCS
 
about
http://www.passlabs.com/pdfs/articles/seclassa.pdf
I read follow:
In 1977 I designed and published in Audio Magazine a single-ended
Class A amplifier using bipolar followers biased by a constant current
source. A considerable number of amateurs have built the device, rated
at 20 watts output, and many have commented on its unique sonic
signature. It is one of the very few examples of a solid state single-
ended output stage available.


Which audio magazine? Are this paper online?
Who knows the URL?

Peter M. 25th March 2011 11:26 PM

Is it this one?

http://www.passdiy.com/pdf/classa_amp.pdf

tiefbassuebertr 25th March 2011 11:36 PM

Quote:

Originally Posted by Peter M. (Post 2516482)

I think, yes - thank you very much. Because there isn't a exact name by this amp project like "ZEN" or "Death of ZEN" it is hard to find - if at all, only by chance.
Construct A Class-A Amplifier

Who knows the title of the audio magazine at those days ?? Was it the MJ magazine mentioned about
http://www.diyaudio.com/forums/solid...09-wanted.html

CanAm Man 25th March 2011 11:39 PM

Peter M. Re: Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...

I discovered a while back it's always better to use a FRIEND'S FINGERS to check if there still is voltage left in a capacitor....... or a friend's cat.....

:D

Melon Head 25th March 2011 11:41 PM

Whatever you do, don't use your tongue

Peter M. 25th March 2011 11:53 PM

Quote:

Originally Posted by tiefbassuebertr (Post 2516499)
I think, yes - thank you very much. Because there isn't a exact name by this amp project like "ZEN" or "Death of ZEN" it is hard to find - if at all, only by chance.
Construct A Class-A Amplifier

Who knows the title of the audio magazine at those days ?? Was it the MJ magazine mentioned about
http://www.diyaudio.com/forums/solid...09-wanted.html


You`re welcome :)

Peter M. 25th March 2011 11:54 PM

Quote:

Originally Posted by CanAm Man (Post 2516503)
Peter M. Re: Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...

I discovered a while back it's always better to use a FRIEND'S FINGERS to check if there still is voltage left in a capacitor....... or a friend's cat.....

:D

Haha, I`ll try that next time :D

Peter M. 25th March 2011 11:55 PM

Quote:

Originally Posted by Melon Head (Post 2516506)
Whatever you do, don't use your tongue

I`ll try to remember that :D

CanAm Man 26th March 2011 12:02 AM

Remember, though, if you elect to use your friend's cat, this might only work for nine times--before you need to find another cat.

It's all a function of joules, ergs, and skin resistance.....:eek:

Nelson Pass 26th March 2011 01:03 AM

1 Attachment(s)
That article appeared in Audio Magazine in 1977, as I
recall. It is listed in the article downloads as Pass Labs
as the A20

:cool:


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