Hello Frex,
I have only just finished populating my ERMSDCv2 board. Latish in the evening here so I will do more thorough testing later but for now, it turns on and my bench supply says that it is using 90mA per rail so that looks to be a healthy first sign. I will do more tests in a week or so as I am waiting for a new multimeter to arrive that will let me better calibrate things.
I have included the resistor change suggested by branadic too
Regards,
Chris
I have only just finished populating my ERMSDCv2 board. Latish in the evening here so I will do more thorough testing later but for now, it turns on and my bench supply says that it is using 90mA per rail so that looks to be a healthy first sign. I will do more tests in a week or so as I am waiting for a new multimeter to arrive that will let me better calibrate things.
I have included the resistor change suggested by branadic too
Regards,
Chris
Attachments
Hi Frex,
The ERMSDC I assembled is working great. I was able to find suitable parts in the US at Mouser and Newark/Element 14.
I spent a few more cents and used solid Tantalum SMT caps for the power supply bypass caps.
Some of the Wima film caps I chose and the newer OSCON caps are slightly larger than expected and near the edge of the board, but if you are careful as you slide the PCB into the case, you can get them to fit well.
I included the branadic mod values, and like Chris, I used a mini-XLR jack for the power.
I powered it from a stack of Li Ion 16340 batteries that create about +/-8VDC.
Thanks Frex!
Miq
The ERMSDC I assembled is working great. I was able to find suitable parts in the US at Mouser and Newark/Element 14.
I spent a few more cents and used solid Tantalum SMT caps for the power supply bypass caps.
Some of the Wima film caps I chose and the newer OSCON caps are slightly larger than expected and near the edge of the board, but if you are careful as you slide the PCB into the case, you can get them to fit well.
I included the branadic mod values, and like Chris, I used a mini-XLR jack for the power.
I powered it from a stack of Li Ion 16340 batteries that create about +/-8VDC.
Thanks Frex!
Miq
An externally hosted image should be here but it was not working when we last tested it.
Hello,
Miq, good job !
Happy to see that you have done this successfully !
Bruce,
Yes, I have bare PCB of the ERMSDCv2 available for sale.
Price is 25€ each, including worldwide shipping.
A full zipped design folder is also provided to build the project without issue (send by email).
If interested, please send me a PM.
Regards
Frex
Frex
Miq, good job !
Happy to see that you have done this successfully !
Bruce,
Yes, I have bare PCB of the ERMSDCv2 available for sale.
Price is 25€ each, including worldwide shipping.
A full zipped design folder is also provided to build the project without issue (send by email).
If interested, please send me a PM.
Regards
Frex
Frex
I wanted to thank Frex making this project available. The build and calibration went smoothly without any unpleasant surprises.
I'm including the noise floor plot for the LNA from my QA401 (50R terminated input). The noise calculates to the insane 437 nV in the 20 Hz - 90 kHz bandwidth! And the responce shows no spikes and mains harmonics.
DC-RMS converter is a bit imprecise with low lelev signals (0.1V and less), but this is not that important to me. The main task for this is measuring PSU noise.
And if you're looking for an affordable high grade measurement tool, this may be the ticket. All in all, I've spent around 300$ for parts and a day of labor. And comparable commercial instruments can easily cost thousands of dollars.
I'm including the noise floor plot for the LNA from my QA401 (50R terminated input). The noise calculates to the insane 437 nV in the 20 Hz - 90 kHz bandwidth! And the responce shows no spikes and mains harmonics.
DC-RMS converter is a bit imprecise with low lelev signals (0.1V and less), but this is not that important to me. The main task for this is measuring PSU noise.
And if you're looking for an affordable high grade measurement tool, this may be the ticket. All in all, I've spent around 300$ for parts and a day of labor. And comparable commercial instruments can easily cost thousands of dollars.
Attachments
Hello all,
I update this post because despite it is a little old, there is always
several user requests to build this project.
So, I run from time to time small batch of PCB to satisfy the demand.
I decided also (as for others projects) to improve the design.
It's not here the main board itself, but the mechanical side.
I made a small PCB for the front and rear panels of the Hammond enclosure
used to fit the main PCB. These PCB's avoid mechanical job on the panels,
remove also the need of stickers and give a more professional look
of the finished unit !
So now, I provide the ERMSDCV2 main PCB with these new panels PCB included.
Below, some picture of the new PCB set and my own unit equipped with PCB panels :
For anyone interested to build the unit,
the main PCB with the new front/rear PCB panel is 23€.
This price includes the worldwide shipping in unregistered priority letter
(if registered letter with tracking is required add +3€).
For those that have already the ERMSDCV2 design and would want
to get only the front/rear panels PCB, it is possible.
The price is 10€ including shipping (unregistered priority letter).
Anyone interested can send me PM.
Note that many project information's are still available on the first
post of this thread.You can access it HERE.
You can also download the full schematics and bill of material here :
ERMSDCV2.3_SCHEMATIC
ERMSDCV2.33_BOM
Best regards.
Frex
I update this post because despite it is a little old, there is always
several user requests to build this project.
So, I run from time to time small batch of PCB to satisfy the demand.
I decided also (as for others projects) to improve the design.
It's not here the main board itself, but the mechanical side.
I made a small PCB for the front and rear panels of the Hammond enclosure
used to fit the main PCB. These PCB's avoid mechanical job on the panels,
remove also the need of stickers and give a more professional look
of the finished unit !
So now, I provide the ERMSDCV2 main PCB with these new panels PCB included.
Below, some picture of the new PCB set and my own unit equipped with PCB panels :
For anyone interested to build the unit,
the main PCB with the new front/rear PCB panel is 23€.
This price includes the worldwide shipping in unregistered priority letter
(if registered letter with tracking is required add +3€).
For those that have already the ERMSDCV2 design and would want
to get only the front/rear panels PCB, it is possible.
The price is 10€ including shipping (unregistered priority letter).
Anyone interested can send me PM.
Note that many project information's are still available on the first
post of this thread.You can access it HERE.
You can also download the full schematics and bill of material here :
ERMSDCV2.3_SCHEMATIC
ERMSDCV2.33_BOM
Best regards.
Frex