I am very late to the party but am in need of 4 boards. Are the Gerber files available, or does anyone have any boards from the previous group buy still available?
Unfortunately I have no boards left from the group buy. However, I just designed a new board for the same circuit:
After building one and verifying its performance, I have four spare boards of this design. PM me if interested.
The differences from the earlier board are:
The common mode rejection is very much defined by the matching of the resistors. The results shown below are for 0.1% CMF55 resistors (the brown ones in the photo above):
The ground sense reduces the difference between the local ground and that of the downstream device by about 40dB:
The board if relatively wideband:
After building one and verifying its performance, I have four spare boards of this design. PM me if interested.
The differences from the earlier board are:
- Input is now protected by a quad of diodes as suggested above by @Mark Tillotson
- "Normal" size (D=2.5mm L=7mm axial) resistors are used throughout
- More room for input, output and power connectors - Molex KK254 or similar-sized connectors can be used
- Slightly larger board, 50×50mm size (one channel)
The common mode rejection is very much defined by the matching of the resistors. The results shown below are for 0.1% CMF55 resistors (the brown ones in the photo above):
The ground sense reduces the difference between the local ground and that of the downstream device by about 40dB:
The board if relatively wideband:
Oh, it'd be perfect if you built boards that work with Neutrik's PCB-termination XLR jacks. 🙂 Does anyone ever put anything else in between?
https://www.neutrik.com/en/product/nc3fd-h
https://www.neutrik.com/en/product/nc3fd-h
Something like this?
This one is not mine (the source is here, in Russian). This board carries an INA137 and a regulated power supply for it.
I have avoided making PCBs for the public that limit the mechanical layout of the chassis, including connector or knob placement. But as the photo above shows, nothing is impossible.
This one is not mine (the source is here, in Russian). This board carries an INA137 and a regulated power supply for it.
I have avoided making PCBs for the public that limit the mechanical layout of the chassis, including connector or knob placement. But as the photo above shows, nothing is impossible.
I was thinking a PCB that would mount by directly soldering to the PCB pins of the Neutrik jack, to save on wiring efforts as well as drilling/tapping/mounting on a sheet or backplate/baseplate. As far as universality goes, Neutrik jacks should be available pretty much anywhere in the world and I don't see any reason they couldn't be shopped for any application.
https://www.audiosciencereview.com/...d-measurements-of-hifiberry-dac-pro-xlr.8569/
https://shop.klotz-ais.com/mis-tx4mk-1.html
These examples above have multiple jacks per board but obviously not a requirement by any means.
https://www.audiosciencereview.com/...d-measurements-of-hifiberry-dac-pro-xlr.8569/
https://shop.klotz-ais.com/mis-tx4mk-1.html
These examples above have multiple jacks per board but obviously not a requirement by any means.