Amp Camp Amp - ACA

flg · 05:49 AM

Amp Camp Kit purchasers: we'll put the link here when we have the step by step photo build guide finished. Until then I'm sure most of your questions
can be answered here..

Ipanema · 30th June 2012, 03:02 PM

I try to understand this circuit. Any difference if output taken direct from source of Q2 instead of through R1//R2?

Melon Head · 1st July 2012, 12:18 AM

Looks like I have another toy to play with. Thanks Nelson
Even greater thanks for designing the PCB.
I don't have time for point to point wiring anymore.

Melon Head · 1st July 2012, 01:02 AM

Is it ok to replace Q1 with IRFP9240 and run as source follower?

Melon Head · 01:13 AM

Quote:

Originally Posted by Melon Head

Is it ok to replace Q1 with IRFP9240 and run as source follower?

The other option is run more feedback in the final amp. I'd rather have less gain or no gain.

flg · 1st July 2012, 02:04 AM

I'm lookin at this thing thinkin... If you change out Q1 with a Semisouth part...

Melon Head · 02:36 AM

Quote:

Originally Posted by flg

I'm lookin at this thing thinkin... If you change out Q1 with a Semisouth part...

Yes that is for certain.
Now that I have some high effiiciency speakers, I think I will be buying 10 of these PCB's and set them up with different components, operating points etc, just for fun and to see what the audible difference might be.

flg · 1st July 2012, 08:17 AM

Or, maybe a SIT part in place of Q1?

geraldfryjr · 11:33 AM

I like this topology.

Here are a few similar designs that I have come up with a while back, although all of them shown but one uses an opamp for the input stage,

All Discrete Class-A Headphone Amp

I have many versions like this ranging from low voltage to high voltage designs using both opamps and BJT's for the input stages.

Enjoy !!!

jer

Antoinel · 1st July 2012, 11:27 AM

The feedback of the DIYers at Amp Camp #1 will be valuable to read.

30th June 2012, 06:55 AM	#1
flg diyAudio Member Join Date: Jul 2005 Location: North East	Amp Camp Amp - ACA Looky Here... Amp Camp Amp #1 Amp Camp Kit purchasers: we'll put the link here when we have the step by step photo build guide finished. Until then I'm sure most of your questions can be answered here.. __________________ “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 Last edited by Variac; 11th September 2012 at 05:49 AM.

1st July 2012, 02:04 AM	#6
flg diyAudio Member Join Date: Jul 2005 Location: North East	I'm lookin at this thing thinkin... If you change out Q1 with a Semisouth part... __________________ “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, 08:17 AM	#8
flg diyAudio Member Join Date: Jul 2005 Location: North East	Or, maybe a SIT part in place of Q1? __________________ “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, 11:27 AM	#9
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	I like this topology. Here are a few similar designs that I have come up with a while back, although all of them shown but one uses an opamp for the input stage, All Discrete Class-A Headphone Amp I have many versions like this ranging from low voltage to high voltage designs using both opamps and BJT's for the input stages. Enjoy !!! jer Last edited by geraldfryjr; 1st July 2012 at 11:33 AM.

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30th June 2012, 03:02 PM	#2
Ipanema diyAudio Member Join Date: Jun 2004 Location: KL	I try to understand this circuit. Any difference if output taken direct from source of Q2 instead of through R1//R2?

1st July 2012, 12:18 AM	#3
Melon Head Banned Join Date: Nov 2006	Looks like I have another toy to play with. Thanks Nelson Even greater thanks for designing the PCB. I don't have time for point to point wiring anymore.

1st July 2012, 01:02 AM	#4
Melon Head Banned Join Date: Nov 2006	Is it ok to replace Q1 with IRFP9240 and run as source follower?

1st July 2012, 11:27 AM	#10
Antoinel diyAudio Member Join Date: Jan 2012 Location: Pennsylvania Blog Entries: 1	The feedback of the DIYers at Amp Camp #1 will be valuable to read.

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