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Amp Camp Pre+Headphone Amp - ACP+
Amp Camp Pre+Headphone Amp - ACP+
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Old 17th January 2020, 08:51 PM   #201
TungstenAudio is offline TungstenAudio  United States
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I originally had that vero design slated for use as a front end for my M2x or F6. As such, I reduced the gain to about 6 dB, and used a smaller output cap. But the circuit topology is the same.
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Old 17th January 2020, 09:01 PM   #202
kacernator is offline kacernator  Czech Republic
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Default Mosfet input variant

Hi,

I tried simulating schematics with mosfet input. Do you think everything looks fine and it is worth building prototype?

Thanks.
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File Type: jpg ACP.JPG (174.5 KB, 238 views)
File Type: jpg Bode diagram.jpg (124.9 KB, 231 views)
File Type: jpg Transient.jpg (123.7 KB, 223 views)
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Old 17th January 2020, 09:45 PM   #203
kacernator is offline kacernator  Czech Republic
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Default Mosfet input variant UPDATE

Using zener instead of bjt for Mosfet CCS.
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File Type: jpg Bode diagram.jpg (128.8 KB, 208 views)
File Type: jpg Transient.jpg (114.4 KB, 205 views)
File Type: jpg ACP.JPG (175.0 KB, 56 views)

Last edited by kacernator; 17th January 2020 at 09:56 PM.
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Old 18th January 2020, 12:54 AM   #204
Zen Mod is online now Zen Mod  Serbia
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Amp Camp Pre+Headphone Amp - ACP+
when done properly , you'll not hear bloody difference between CCS variants

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Old 18th January 2020, 07:56 PM   #205
kacernator is offline kacernator  Czech Republic
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Default Optimized for 32 Ohm headphones

In the ACP manual Nelson says:
"Of particular note, the gain circuit has been optimized around a 32 ohm load, and performs best at this impedance. Not that it can't drive other loads, as you will see...."

So what can we expect when driving higher impedance headphones like 300 ohm? Different distortion characteristic? How is it different?
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Old 19th January 2020, 12:45 AM   #206
Gaz2613 is offline Gaz2613  United Kingdom
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Hi guys I am still wondering where to get one of these boards from as I would like to build one. Cheers.
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Old 19th January 2020, 01:08 AM   #207
Mark Johnson is offline Mark Johnson  United States
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Amp Camp Pre+Headphone Amp - ACP+
Quote:
Originally Posted by Gaz2613 View Post
Hi guys I am still wondering where to get one of these boards from as I would like to build one. Cheers.
Please review posts #188, #189, and #199 in this thread.

It is after all Do It Yourself audio.
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