|
|||||||
| Home | Forums | Rules | Articles | diyAudio Store | Blogs | Gallery | Wiki | Register | Donations | FAQ | Calendar | Mark Forums Read |
| Equipment & Tools From test equipment to hand tools |
  |
|
|
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
 |
|
|
Thread Tools |
14th January 2021, 08:30 PM
|
#83 |
|
diyAudio Member
Join Date: Aug 2016
Location: Athens, Greece
|
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.
|
|
|
18th January 2021, 02:18 PM
|
#84 |
|
diyAudio Member
Join Date: May 2018
Location: Cambridge UK
|
What units are those measurements in ?
|
|
|
|
| Thread Tools | |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Shoe Horn? (pun intended) | chuyler1 | Full Range | 16 | 4th March 2011 07:49 AM |
| Designing a loudspeaker intended to use with a digital crossover | Pagnol | Multi-Way | 16 | 8th April 2010 11:48 PM |
| Will this balanced PSU work as intended? | Will | Solid State | 4 | 24th February 2009 09:41 PM |
| This PS should work as intended, right? | cetoole | Parts | 0 | 10th January 2006 05:30 AM |
| New To Site? | Need Help? |
