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Old 30th June 2012, 06:55 AM   #1
flg is offline flg  United States
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Default Amp Camp Amp - ACA

Looky Here... Amp Camp Amp #1


Amp Camp Kit purchasers: Here's the step by step photo build guide:
ACA illustrated build guide


Make sure to see post #1453 for an important tweak!
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Last edited by Variac; 11th December 2013 at 08:43 PM.
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Old 30th June 2012, 03:02 PM   #2
Ipanema is offline Ipanema  Malaysia
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I try to understand this circuit. Any difference if output taken direct from source of Q2 instead of through R1//R2?
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Old 1st July 2012, 12:18 AM   #3
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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.
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Old 1st July 2012, 01:02 AM   #4
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Is it ok to replace Q1 with IRFP9240 and run as source follower?
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Old 1st July 2012, 01:04 AM   #5
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Quote:
Originally Posted by Melon Head View Post
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.
Attached Images
File Type: png ampcamp1_simple2.png (25.3 KB, 10169 views)

Last edited by Melon Head; 1st July 2012 at 01:13 AM.
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Old 1st July 2012, 02:04 AM   #6
flg is offline flg  United States
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I'm lookin at this thing thinkin... If you change out Q1 with a Semisouth part...
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Old 1st July 2012, 02:14 AM   #7
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Originally Posted by flg View Post
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.

Last edited by Melon Head; 1st July 2012 at 02:36 AM.
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Old 1st July 2012, 08:17 AM   #8
flg is offline flg  United States
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Or, maybe a SIT part in place of Q1?
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Old 1st July 2012, 11:27 AM   #9
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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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Old 1st July 2012, 11:27 AM   #10
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The feedback of the DIYers at Amp Camp #1 will be valuable to read.
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