Amp Camp Amp - ACA - Page 2

flg · 1st July 2012, 12:11 PM

I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there?

Melon Head · 1st July 2012, 01:02 PM

I don't think this circuit will work the way it is.
Isn't Vgs of Q1 at 0V?

Melon Head · 1st July 2012, 01:32 PM

It pays to read the article a few times.

From the article:
"The above circuit does not yet make allowance for providing the correct DC voltage on the Gate pin of Q1 so as to conduct electricity."

Antoinel · 1st July 2012, 01:41 PM

Quote:

Originally Posted by flg

I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there?

Clearly a question to Mr. Pass.

buzzforb · 01:51 PM

Quote:

Originally Posted by flg

I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there?

Would increase available gain as well as output impedance. Using more linear parts like SiT or SiC, may be unnecessary. Looking at the Sit 1, I believe you will see that lack of Rs. Nelson also spoke of new cascode degeneration. This could perhaps give him the loadline cancellation using SiT devices without the need for Rs, sort of like F3 trick. Just guessing, though.

juanitox · 03:32 PM

interesting, is this CCS will work with the 2SK82 also ?

buzzforb · 1st July 2012, 03:42 PM

why not?

shawea · 1st July 2012, 04:06 PM

So pretty much a total newb here. But I did get to go to this camp, and had an amazing time. I learned a ton about introductory electronics etc, how this amp works and why, and some basic sound theory, most of this you guys all know like the back of your hand. But as my first real musical electronics project this was an amazing time, with amazing people, and coming out of it with 2 amazing amps is just straight exhilarating.

So now, Im trying to figure out how to pair speakers to this (again total beginner). Jason was saying something about this ends up being a 5 watt class a power amp, which requires high sensitivity speakers (95db+). But I'm not exactly sure what this means or how to find a good match. Any advice, or questions about the camp and my experience there?

jan.didden · 1st July 2012, 04:28 PM

This sounds like a fantastic project to do, wish I could have been there!
Maybe I should do one in Europe...

jan didden

AudioSan · 1st July 2012, 04:37 PM

do i see a nice little bedroom amp?

1st July 2012, 12:11 PM	#11
flg diyAudio Member Join Date: Jul 2005 Location: North East	I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there? __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

1st July 2012, 03:29 PM	#16
juanitox diyAudio Member Join Date: Dec 2006	interesting, is this CCS will work with the 2SK82 also ? __________________ French is not a crime. Last edited by juanitox; 1st July 2012 at 03:32 PM.

1st July 2012, 03:42 PM	#17
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	why not? __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

1st July 2012, 04:28 PM	#19
jan.didden diyAudio Member Join Date: May 2002 Location: Great City of Turnhout, Belgium Blog Entries: 6	This sounds like a fantastic project to do, wish I could have been there! Maybe I should do one in Europe... jan didden __________________ It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts - Sherlock Holmes Check out Linear Audio Vol 5!

1st July 2012, 04:37 PM	#20
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	do i see a nice little bedroom amp? __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers


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1st July 2012, 01:32 PM	#13
Melon Head Banned Join Date: Nov 2006	It pays to read the article a few times. From the article: "The above circuit does not yet make allowance for providing the correct DC voltage on the Gate pin of Q1 so as to conduct electricity."

1st July 2012, 04:06 PM	#18
shawea diyAudio Member Join Date: Jul 2012	So pretty much a total newb here. But I did get to go to this camp, and had an amazing time. I learned a ton about introductory electronics etc, how this amp works and why, and some basic sound theory, most of this you guys all know like the back of your hand. But as my first real musical electronics project this was an amazing time, with amazing people, and coming out of it with 2 amazing amps is just straight exhilarating. So now, Im trying to figure out how to pair speakers to this (again total beginner). Jason was saying something about this ends up being a 5 watt class a power amp, which requires high sensitivity speakers (95db+). But I'm not exactly sure what this means or how to find a good match. Any advice, or questions about the camp and my experience there?

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