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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
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Old 3rd July 2018, 10:39 AM   #581
iancanada is offline iancanada  Canada
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
Quote:
Originally Posted by ofswitched View Post
Using a 18650 battery to charge supercapacitor
That's a good idea.

Regards,
Ian
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Old 3rd July 2018, 01:54 PM   #582
Greg Stewart is offline Greg Stewart  United States
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
Quote:
Originally Posted by matthiasw View Post
Matt,

Uptone uses the LTM4607 as the charging DC-DC converter for their LPS-1.2 version, which gives them additional flexibility in the energizing supply.

I was referring to the devices they use to connect / isolate the banks of Ultracaps to / from the energizing supply / output load. They didn't use relays (which Vinnie Rossi used to use) for reliability reasons and noise. They didn't use MOSFETs because the high-ish off capacitance allows feed-through of some noise from the energizing supply if it uses an SMPS. What they do use are selected low-off-capacitance transistors, moving to an even lower C one for the 1.2 version for greater isolation for 'high-source-impedance leakage currents'.

Greg in Mississippi
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Old 3rd July 2018, 04:46 PM   #583
SonofThor is offline SonofThor  United Kingdom
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Ian,

I've been following this thread (and the Katana thread) for some time - some very interesting stuff in here! Which of the things discussed are actually available? Are the 9028/9038 DAC's available? Is the Isolator/FIFO reclocker available (I currently use an IsolatorPi with the Allo Kali/Piano 2.1)? Very interested in the progress with the Ultracap PSU's too and the control side of things...

Si
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Old 3rd July 2018, 05:57 PM   #584
clsidxxl is offline clsidxxl  France
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Quote:
Originally Posted by iancanada View Post
UCPi together with RPi DAC

Click the image to open in full size.
UCPi_RPi_1 by Ian, on Flickr

Beautiful, great building Ian,thank for the photo.
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Old 3rd July 2018, 07:44 PM   #585
folzag is offline folzag  United States
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+1. Been wondering exactly that myself.
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Old 4th July 2018, 01:22 AM   #586
Greg Stewart is offline Greg Stewart  United States
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
@SonofThor & @folzag,

Much of it is in development & alpha testing right now, with a few products available in Ian's last group buy.

Status (as I understand them... Ian may have some additional info):

RPi DAC cards... Initial ES9018K2M board with on-board output stage superceded by initial ES9028Q2M board with plug-in output stages, used for output transformer & I/V stage trials. ES9038Q2M & dual mono ES9038Q2M boards in prototype stage, future releases.

RPi DAC output stage cards... Generic transformer output stage proto-board in-use for trials of various output transformers, once one is chosen as good cost effective choice a board designed for that transformer is expected. Possibly Lundahl LL1544A? OPA861 & OPA1632 boards in prototype stages. All possible future release after listening trials.

UC Pi (Ultracap RPi DAC power supply)... Prototype running, additional prototypes expected soon, likely will grow into a more sophisticated unit after trials, future release after x development cycles.

ESS DAC controller... prototypes operational and working well, handles at least ES9018K2M, ES9038Q2M, ES9028Q2M, and possibly more, future release.

RPi I2S output board... Rev 1 available in last group buy, Rev 2 designed & prototyped to accommodate interface to ESS DAC controller, future release.

IsolatorPi... Rev 1 available in last group buy, Rev 2 designed & prototyped with additional features, future release.

DOP to DSD decoder... works on IsolatorPi, available in last group buy.

FIFOPi (integrated isolator / FIFO reclocker / clock board)... in development, future release. Ian may have mentioned it also includes the DOP to DSD decoder functionality, but I may be wrong on that.

LT3042 regulator boards... prototypes in-use on the DAC boards and the UCPi, future release.

I've been honored to be an Alpha tester for some of Ian's great designs and have used some of his other designs (such as his I2S FIFO setup) in some of my gear builds, they've been some great additions to my collection of digital playback setups.

Greg in Mississippi

P.S. How'd I do, Ian?
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Last edited by Greg Stewart; 4th July 2018 at 01:27 AM.
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Old 4th July 2018, 11:42 AM   #587
SonofThor is offline SonofThor  United Kingdom
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Quote:
Originally Posted by Greg Stewart View Post
@SonofThor & @folzag,

Much of it is in development & alpha testing right now, with a few products available in Ian's last group buy.

Status (as I understand them... Ian may have some additional info):

RPi DAC cards... Initial ES9018K2M board with on-board output stage superceded by initial ES9028Q2M board with plug-in output stages, used for output transformer & I/V stage trials. ES9038Q2M & dual mono ES9038Q2M boards in prototype stage, future releases.

RPi DAC output stage cards... Generic transformer output stage proto-board in-use for trials of various output transformers, once one is chosen as good cost effective choice a board designed for that transformer is expected. Possibly Lundahl LL1544A? OPA861 & OPA1632 boards in prototype stages. All possible future release after listening trials.

UC Pi (Ultracap RPi DAC power supply)... Prototype running, additional prototypes expected soon, likely will grow into a more sophisticated unit after trials, future release after x development cycles.

ESS DAC controller... prototypes operational and working well, handles at least ES9018K2M, ES9038Q2M, ES9028Q2M, and possibly more, future release.

RPi I2S output board... Rev 1 available in last group buy, Rev 2 designed & prototyped to accommodate interface to ESS DAC controller, future release.

IsolatorPi... Rev 1 available in last group buy, Rev 2 designed & prototyped with additional features, future release.

DOP to DSD decoder... works on IsolatorPi, available in last group buy.

FIFOPi (integrated isolator / FIFO reclocker / clock board)... in development, future release. Ian may have mentioned it also includes the DOP to DSD decoder functionality, but I may be wrong on that.

LT3042 regulator boards... prototypes in-use on the DAC boards and the UCPi, future release.

I've been honored to be an Alpha tester for some of Ian's great designs and have used some of his other designs (such as his I2S FIFO setup) in some of my gear builds, they've been some great additions to my collection of digital playback setups.

Greg in Mississippi

P.S. How'd I do, Ian?
Greg, thanks for the detailed info - much appreciated!
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Old 8th July 2018, 10:23 PM   #588
smoothquark is offline smoothquark  United Kingdom
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Hi Ian, I am still not clear if the ESS DAC controller has linux drivers to enable volume control using the RPi? I am keen to see if it will work on my current ES9018 DAC via i2c.
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Old 17th July 2018, 01:50 AM   #589
marcus1 is offline marcus1
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Hi Greg

Just interested if you have managed to assemble the UCPi power supply as yet and if so, what are your impressions?

Thanks

Quote:
Originally Posted by Greg Stewart View Post
Ian,

According to the US Postal Service, the package should be here today or tomorrow. That was why I was working so hard to get ready for it. I'll let you know when I have it in hand and what questions I have.

Thanks for the complements on the soldering. No oven here, just good eyes, a steady hand, VERY fine soldering tips, GOOD fine solder, and a LOT of practice. BUT that package you chose for the LT3042 DID require me to use a magnifier (cell-phone camera) to confirm I had them lined up before the final soldering and to inspect afterwards. All of them did work with no need for rework!

Later!

Greg in Mississippi

P.S. On relays versus MOSFETs for switching, I'm pretty familiar with the operation and to some extent, the design of the Uptone Audio LPS-1 & LPS-1.2. John Swenson chose to use a low-capacitance transistor as his switching element, instead of either a relay (noisy & won't be reliable over time) or MOSFET (higher off-capacitance will allow some leakage of noise from any SMPS used in the charging circuit OR in some cases, powering upstream gear). Ian, I can put you in contact with him on this if you wish... or just get the PN off the transistors in the units I have here.
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Old 17th July 2018, 01:47 PM   #590
Greg Stewart is offline Greg Stewart  United States
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
@marcus1, after the boards arrived, I needed to go over the documentation from Ian and get the appropriate parts ordered. They are here, will be assembling and setting them up for tests this week and weekend. They'll be sharing my bench and system time with a new Allo.com Katana which also just arrived for trials.

@smoothquark, I cannot speak for what Ian plans to do to enhance and extend the functionality of his controller, but AFAIK, it is currently implemented to act as a direct controller of the ESS DAC and does not interface or communicate with any drivers on the RPi. Ian may chime in and correct me, but that is how I believe it is functioning as of today. It does control the volume via the volume control functionality ESS built into their DAC chips and does so very well, both with the on-board rotary controller AND via IR remote.

Greg in Mississippi
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