F5 power amplifier - Page 67

Nelson Pass · 9th May 2008, 09:21 PM

Quote:

Originally posted by darian
Sorry to be annoying but that's funny how no one did give a damn about the Profet schematic in it's time despite the rave reviews by audioXpress... So it's all by a well-known french designer named Plantefeve and he's got a nice website about amplifiers too.

This has been discussed before. As I said in the article, "The
topology is familiar." Complementary feedback pairs, AKA
Conjugate complementaries, are elementary and go way back.

My first exposure was from the Motorola app notes, late 60's -early 70's.

Why did no one give a damn about the Profet?

Maybe they did. Maybe they won't give a damn about the F5.

MEH · 10th May 2008, 12:00 AM

Damn.

Nelson Pass · 10th May 2008, 12:26 AM

By the way, I did write a nice note to Mr. Plantefeve apologizing
about the coincidental parts of the design, and I promised to
pay more attention to his work in the future.

defect9 · 10th May 2008, 12:59 AM

Finally got a copy of the May AudioXpress mag. Damn, I'm really glad I picked this up. it's way easier than trying to pick the information out of the thread, and all the explanation of "why" helps me out a lot, especially the analogy of FET devices (which I could never understand).

I'm definitely building this one.

one question though, if I wanted to add a headphone out (for late night listening), what are some good ways to do it?

-Jared

GRollins · 10th May 2008, 01:10 AM

Either add resistors to cut the power down or build a dedicated mini-version.

Grey

defect9 · 10th May 2008, 03:32 AM

Quote:

Originally posted by GRollins
Either add resistors to cut the power down or build a dedicated mini-version.

Grey

okay being a bit of a newb to this, having only built one kit and one "from schematic" amp, where would be the best place to put these resistors? All the books I've gotten dont really delve far enough into audio electronics for me to be certain where to put them.

I definitely don't have the know-how to pull off designing a mini version yet.

Variac · 10th May 2008, 05:31 AM

But Grey does!

seventenths · 10th May 2008, 06:57 PM

Well I lucked out and picked up one of two copies of AxP that hit my local bookstore! I sure hope I don't appear to be TOTALLY self- absorbed, reading the article during my sons little league game, but a mans gotta do what a mans gotta do

7/10

sandstorm33 · 10th May 2008, 07:12 PM

Quote:

Originally posted by seventenths
Well I lucked out and picked up one of two copies of AxP that hit my local bookstore! I sure hope I don't appear to be TOTALLY self- absorbed, reading the article during my sons little league game, but a mans gotta do what a mans gotta do

7/10

Poor Kid!!..Hopefully delinquency wont follow...

seventenths · 10th May 2008, 07:44 PM

At least it's just a magazine... I'll be leaving the butane soldering iron at home

7/10

10th May 2008, 05:31 AM	#667
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	But Grey does! __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

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10th May 2008, 12:00 AM	#662
MEH diyAudio Member Join Date: Feb 2007	Damn.

10th May 2008, 12:26 AM	#663
Nelson Pass The one and only Join Date: Mar 2001	By the way, I did write a nice note to Mr. Plantefeve apologizing about the coincidental parts of the design, and I promised to pay more attention to his work in the future.

10th May 2008, 12:59 AM	#664
defect9 diyAudio Member Join Date: Sep 2007 Location: Carson City, NV	Finally got a copy of the May AudioXpress mag. Damn, I'm really glad I picked this up. it's way easier than trying to pick the information out of the thread, and all the explanation of "why" helps me out a lot, especially the analogy of FET devices (which I could never understand). I'm definitely building this one. one question though, if I wanted to add a headphone out (for late night listening), what are some good ways to do it? -Jared

10th May 2008, 01:10 AM	#665
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Either add resistors to cut the power down or build a dedicated mini-version. Grey

10th May 2008, 06:57 PM	#668
seventenths diyAudio Member Join Date: Apr 2007	Well I lucked out and picked up one of two copies of AxP that hit my local bookstore! I sure hope I don't appear to be TOTALLY self- absorbed, reading the article during my sons little league game, but a mans gotta do what a mans gotta do 7/10

10th May 2008, 07:44 PM	#670
seventenths diyAudio Member Join Date: Apr 2007	At least it's just a magazine... I'll be leaving the butane soldering iron at home 7/10

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