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Amp Camp Amp - ACA
Amp Camp Amp - ACA
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Old 2nd December 2019, 08:57 PM   #8281
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by TungstenAudio View Post
Use two ACAs in one of their monoblock configurations. The PSU induced warbles cancel each other out almost perfectly. Problem solved
I was surprised how well this worked in a balanced configuration.
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Old 3rd December 2019, 01:08 AM   #8282
Extreme_Boky is offline Extreme_Boky
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I've been thinking about this one.... the reason there's no startup fart/switchoff thump in balanced mode is the fact that speakers' outputs are not referenced to ground. There's no potential difference between two outputs (minuses) at any point in time during turnon/off - hence no complaints from speakers.

...I've got rusty...
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Old 3rd December 2019, 01:41 AM   #8283
6L6 is offline 6L6  United States
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Amp Camp Amp - ACA
Thump totally normal. See post 50 of the build guide -

Amp Camp Amp V1.6 Build Guide - diyAudio Guides
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Old 3rd December 2019, 02:39 AM   #8284
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by 6L6 View Post
Thump totally normal. See post 50 of the build guide -

Amp Camp Amp V1.6 Build Guide - diyAudio Guides

That's okay for a single chassis, stereo ACA version, but we are not talking about that...

What we observed was the absence of startup fart/turnoff thump due to transition occurrences that are happening between two identical ACA modules at the same point in time, and the fact that speakers' binding post are not referenced to ground.

Last edited by Extreme_Boky; 3rd December 2019 at 02:48 AM.
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Old 3rd December 2019, 03:49 AM   #8285
6L6 is offline 6L6  United States
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Amp Camp Amp - ACA
I’m sorry, extremeBoky, for not being more specific, I was responding to rob755 and his question about the thump on a single ACA in post #8278.
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Old 3rd December 2019, 03:59 AM   #8286
Extreme_Boky is offline Extreme_Boky
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Goodness me no need to apologise!

Cheers,
Nick
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Old 6th December 2019, 03:49 AM   #8287
rob755 is offline rob755  United States
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Thanks so much. Very much appreciated!
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Old 8th December 2019, 08:59 AM   #8288
lifefordota is offline lifefordota
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How ACA convert to be headphone amp? Is there any modifications?
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Old 8th December 2019, 09:10 AM   #8289
Stanislav is offline Stanislav  Australia
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It will work great without mods.
The distortion will almost vanish @32ohm and above. So will the output power but you don't need much for cans.
You can consider reducing the bias current somewhat, but keep the 24V supply voltage.

One interesting consideration is the output polarity. Some people find the inverse polarity objectionable, I don't.
I run a Zen Lite as a HPA and it also inverts phase.
One way is to have a pre-amp which inverts first and then everything is sweet.
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Old 8th December 2019, 10:03 AM   #8290
lifefordota is offline lifefordota
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Quote:
Originally Posted by Stanislav View Post
It will work great without mods.
The distortion will almost vanish @32ohm and above. So will the output power but you don't need much for cans.
You can consider reducing the bias current somewhat, but keep the 24V supply voltage.

One interesting consideration is the output polarity. Some people find the inverse polarity objectionable, I don't.
I run a Zen Lite as a HPA and it also inverts phase.
One way is to have a pre-amp which inverts first and then everything is sweet.
my hd 650 is 300ohm, i guess there is no need for reducing the bias current.
how to convert from speaker output to 3.5mm
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