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#81 | |
diyAudio Member
Join Date: Aug 2016
Location: Athens, Greece
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Quote:
Here you are. |
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#82 |
diyAudio Member
Join Date: Jan 2016
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Thanks!
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#83 |
diyAudio Member
Join Date: Aug 2016
Location: Athens, Greece
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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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#84 |
diyAudio Member
Join Date: May 2018
Location: Cambridge UK
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What units are those measurements in ?
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#85 |
diyAudio Member
Join Date: Aug 2016
Location: Athens, Greece
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ARTA is set for dBFS if that is what you are asking.
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