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Mezzanine Power board for Raspberry Pi
Mezzanine Power board for Raspberry Pi
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Old 12th May 2018, 05:34 PM   #21
oxothuk is offline oxothuk  United Arab Emirates
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Join Date: Mar 2012
Location: Umm Al Quwain
Mezzanine board designed to remove mesh of wires and feed both PI and DAC independently from single board using standard GPIO, Module B feeds Raspberry PI and Module C1 (or C1+C2) feeds DAC module, Module A used as pre regulator

6VDC/2A power source required to feed Mezzanine. (actually 1 A is enough in most cases, if you don't connect external USB loads)
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Old 12th May 2018, 08:19 PM   #22
DanielFelix is offline DanielFelix
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Quote:
Originally Posted by oxothuk View Post
Mezzanine board designed to remove mesh of wires and feed both PI and DAC independently from single board using standard GPIO, Module B feeds Raspberry PI and Module C1 (or C1+C2) feeds DAC module, Module A used as pre regulator

6VDC/2A power source required to feed Mezzanine. (actually 1 A is enough in most cases, if you don't connect external USB loads)

Module A must always be included?
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Old 17th May 2018, 08:59 AM   #23
xlisec is offline xlisec  Czech Republic
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I think no. In first post is "Module A can be bypassed".
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Old 17th May 2018, 09:16 AM   #24
xlisec is offline xlisec  Czech Republic
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Is it true when I connect LDOs in series (for example module A and module C) then total PSRR is sum of PSRR module A and PSRR module B?

My case:
I have smps which operates on 100KHz. PSRR at 100KHz of module A (LT3086) is 30db and PSRR of module B (LT3045) 78db. Is total PSRR 108db for my case?
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Old 30th June 2018, 01:04 AM   #25
Greg Stewart is offline Greg Stewart  United States
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Mezzanine Power board for Raspberry Pi
I've been running an RPi source off of a Pi modified with this board to replace the on-board DC-DC switching converters for the last 3-4 weeks. NICE!

IF you want the absolute best SQ you can get out of an RPi sourced setup (at least in my experience... and I've tried a LOT of things), you need to do this to a Pi and listen.

I commented on the various power options I've tried with RPis in this post:

ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
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Old 19th July 2018, 04:24 AM   #26
jborden is offline jborden  United States
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Join Date: Nov 2014
Location: Cincinnati
Mezzanine Power board for Raspberry Pi
I purchased one from website ... seems to be held up at postoffice in Cincinnati for an unusually long time ... my tracking says it arrived in NYC 7/1, made it to Cincinnati regional 7/6 ... and then "in transit to next facility" ... are they trying to figure out what it does or should I just be patient?
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Old 21st July 2018, 04:38 PM   #27
Greg Stewart is offline Greg Stewart  United States
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Join Date: Jul 2003
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Mezzanine Power board for Raspberry Pi
In the beginning of this year, I had a package from Alexey that got stuck in receiving customs in NY. After a few weeks, I contacted him. He said he'd seen that happen occasionally and most of the time they'd start moving again within a month.

That one stayed stuck over a month and he ended up declaring it dead, filing a claim, and sending a new shipment.

Check with Alexey on options if you haven't already.

I hope you get it soon!

Greg in Mississippi
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Old 21st July 2018, 05:17 PM   #28
oxothuk is offline oxothuk  United Arab Emirates
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Join Date: Mar 2012
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Quote:
Originally Posted by Greg Stewart View Post
In the beginning of this year, I had a package from Alexey that got stuck in receiving customs in NY. After a few weeks, I contacted him. He said he'd seen that happen occasionally and most of the time they'd start moving again within a month.

That one stayed stuck over a month and he ended up declaring it dead, filing a claim, and sending a new shipment.

Check with Alexey on options if you haven't already.

I hope you get it soon!

Greg in Mississippi
This story bit different, it is released by NY

and

July 6, 2018, 8:55 am
Arrived at USPS Regional Facility
CINCINNATI OH NETWORK DISTRIBUTION CENTER

July 7, 2018, 7:48 am
Departed USPS Regional Facility
CINCINNATI OH DISTRIBUTION CENTER

July 10, 2018
In Transit to Next Facility
The item is currently in transit to the next facility as of July 10, 2018.

I can not claim if transit time less than 30 days. Best option if you can contact nearest USPS office to check current status.

I worst case i will resend
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Old 26th July 2018, 12:12 PM   #29
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by Greg Stewart View Post
I've been running an RPi source off of a Pi modified with this board to replace the on-board DC-DC switching converters for the last 3-4 weeks. NICE!

IF you want the absolute best SQ you can get out of an RPi sourced setup (at least in my experience... and I've tried a LOT of things), you need to do this to a Pi and listen.

I commented on the various power options I've tried with RPis in this post:

ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi

Did you disable the DC/DC convertor or RPI ? I assume you just removed the IC..or a compoenent around it. Did you test the RPI power requirements at 3.3V and 1.8V (ma) ?
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Old 26th July 2018, 02:40 PM   #30
Greg Stewart is offline Greg Stewart  United States
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Join Date: Jul 2003
Location: Columbus, Mississippi
Mezzanine Power board for Raspberry Pi
Ioan,

I just removed the IC. I haven't gotten the datasheet, I suspect one could disable it too by cutting a lead... but then the rails would be driving the inputs/outputs of the chip.

It is not an easy chip to remove, as it has a large heatsink base. The first couple of times I did it I used a combination of hot air from my rework station and a large soldering iron applied to the top of the chip. The last time I crushed as much of the package as I could remove with pliers and then used the hot-air/large iron combo.

Also the first time I did one, I soldered the leads from the regulator outputs to the output end of the appropriate output capacitors of the DC/DC converter, which I left in place. The 2nd time I soldered the leads to the appropriate test point pads on the bottom of the board which made for a cleaner and more direct connection, but to make sure the leads wouldn't pull the pads, I also used hot-glue to secure the wires and strain relief the build.

I'll post the pictures I used as guides or links to them in other threads later today or this weekend.

Greg in Mississippi
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