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DIY soundcard intended for measuring amplifiers
DIY soundcard intended for measuring amplifiers
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Old 14th January 2021, 08:05 PM   #81
MagicBus is online now MagicBus  Greece
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Quote:
Originally Posted by popeman View Post
That looks great!

Any chance of seeing the frequency response with 192kHz sample rate?

Here you are.
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Old 14th January 2021, 08:27 PM   #82
popeman is offline popeman
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Thanks!
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Old 14th January 2021, 08:30 PM   #83
MagicBus is online now MagicBus  Greece
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Default The high gain preamp

As already said this is Rod Elliott's P158. All info is there. The layout is mine, hopefully performing close to the original. It applies only to the left input and it is SE. So, unbal input mode should be selected to make it work. Also the input of this preamp is DC coupled, no input capacitor. It is engaged with NEC UC2-4,5NU relays. They are supplied from the unused usb Vbus. For the DIYINHK I2S converter here is an easy hack: close to the usb port there is a provision for a three pin connector. I guess this was for selecting usb or external psu with a jumper. Conveniently, this can be used to take the Vbus and also to power the module with 3,3V using a proper gauge wire. See pic. Attached noise floor measurements with input floating free and attenuator full open. The orange line is the basic floor of the input for reference.
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File Type: jpg DIYINHK USB to I2S.JPG (553.8 KB, 77 views)
File Type: jpg x10.JPG (192.0 KB, 83 views)
File Type: jpg x100.JPG (191.8 KB, 81 views)
File Type: jpg x1000.JPG (189.7 KB, 81 views)
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Old Today, 02:18 PM   #84
Mark Tillotson is offline Mark Tillotson
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What units are those measurements in ?
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Old Today, 02:29 PM   #85
MagicBus is online now MagicBus  Greece
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ARTA is set for dBFS if that is what you are asking.
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