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  #1  
Old 12-12-16, 11:29 AM
JohnW JohnW is online now
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MDAC First Listen (part 00110100)

Quote:
Originally Posted by sq225917 View Post
I guess I have the oldest mdac, its one of johns hand built proto versions, it uses different caps, its been on 24-7 for years and doesn't have a single bulging cap.

Its not the heat. I use styrene in the paradise, it runs a class A shunt in each channel, no issues there.
It looks like the the later batch's from the capacitor vendor where not the same as the samples they gave us for evaluation and used to build your PP1 PCB

BTW I just ordered all the components for the Inverse RIAA network - I need to order "odd" resistors values for a Test jig to be used to 100% IQC the MDAC2 crystals so we dont have a repeat of the Crystal problems with MDAC + the MDAC2 crystals are manufactured by a new vendor I visited during my trip to China last month.
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  #2  
Old 12-12-16, 11:41 AM
Achim Achim is offline
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Quote:
Originally Posted by sq225917 View Post
Its not the heat. I use styrene in the paradise, it runs a class A shunt in each channel, no issues there.
Thanks for your info!
  #3  
Old 12-12-16, 11:48 AM
jirij jirij is offline
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Quote:
Originally Posted by JohnW View Post
Optional RPi CM3 SOC board connected via secondary Detox'ed / isolated USB 2.0 easing software support
I guess one upside is that this would allow MCU firmware updates from the microSD card itself, no external computer required, assuming the microSD (or normal SD) slot is easily accessible. I'm still watching linux-next commits to see whether I can get i2s slave working on the nanopi m1 - can't bet anything as I won't be going to Munich, but May is a long time away.

Game on!
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  #4  
Old 12-12-16, 04:19 PM
BigDog BigDog is offline
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Quote:
Originally Posted by BigDog View Post
2.0mm or 2.1mm?
The cable linked in one of your posts was this...

http://www.ebay.com/itm/281958591361...AIT&rmvSB=true

Your comment re the "LPS" looking more like a SMPS was interesting. Too bad one cannot believe what you read!

Totally understand the interest in having the best power supply practical.
John, can you please clarify whether barrel connector is 2.0mm or 2.1mm?
Seems like 2.0 is unusual with 2.1 or 2.5 being more common in my admittedly limited experience.

Considering a custom LPS so like to get handle on a suitable pigtail.

Thanks.
  #5  
Old 12-12-16, 07:00 PM
Obi1 Obi1 is offline
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Is there any reason for Detox not being ready for production soon?
It would be great to have something to play with during the wait for the FDAC.
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  #6  
Old 12-12-16, 11:09 PM
JohnW JohnW is online now
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Quote:
Originally Posted by Obi1 View Post
Is there any reason for Detox not being ready for production soon?
I'm currently spending the first half of my "day" on Detox related production issues - so its very much in the production cycle
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  #7  
Old 12-12-16, 11:10 PM
JohnW JohnW is online now
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Quote:
Originally Posted by BigDog View Post
John, can you please clarify whether barrel connector is 2.0mm or 2.1mm?
Seems like 2.0 is unusual with 2.1 or 2.5 being more common in my admittedly limited experience.

Considering a custom LPS so like to get handle on a suitable pigtail.

Thanks.
I guess its 2.1mm although vendors I talk with refer to it as 2mm type - 0.1mm is well within production tolerances
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  #8  
Old 13-12-16, 12:23 AM
BE718 BE718 is offline
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Quote:
Originally Posted by JohnW View Post
Detox and an undisclosed project - which will be revealed at Munich.



Building the first sample board, update any (hopefully small errors) then releases files to production... they will manufacture the first 10pcs as PP1 (Pre-Production one) boards - once these are approved then its 30 days to full shipping.

With Detox and other projects in production I'll be out in China more often next year so hopefully I can speed-up MDAC2 PCB's (I'll be able to approve in China rather then shipping back to Europe etc).

What takes time is dealing with the component vendors on pricing and then testing and approving samples - as the first two design that are currently going into production share a lot in common with MDAC2 then this will be a faster and simpler process for MDAC2...
OK, seen enough. You now have another project distracting you. Life is too short, time to move on.

John, if you be so good as to advise what I have paid in development costs so I can re-sell my slot for the fdac and detox.

If anyone is interested in my slot please pm me

Thanks

Last edited by BE718; 13-12-16 at 12:36 AM.
  #9  
Old 13-12-16, 03:04 AM
Ian M Ian M is offline
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Quote:
Originally Posted by BE718 View Post
OK, seen enough. You now have another project distracting you. Life is too short, time to move on.

John, if you be so good as to advise what I have paid in development costs so I can re-sell my slot for the fdac and detox.

If anyone is interested in my slot please pm me

Thanks
I've been thinking the same way as you but I think eventually I might regret not getting the FDAC, just to see hear what it's like. Since this is not a closed list yet there is not any incentive for anyone to buy your slot at the moment unless you sell it at a discount.

My problem at the moment is that I no longer have an MDAC and am feeding my current DAC from a Network Audio Adapter - SOtM SMS-200, so I don't know if the Detox is any good to me at the moment.
  #10  
Old 13-12-16, 03:13 AM
JohnW JohnW is online now
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BE718

What makes you say that?

Detox and MDAC2 are the only projects we are working (asides from the mini-streamer test PCB & our "XMOS" USB development PCB to confirm 769KHZ PCM and DSD512 operation, software, clocks and dual 9038 etc).

All will become clear at Munich and the reasons I cannot give more details.

My daily "projects" consist of:-

Detox production updates currently:-

1. Crystals samples approval

2. Approval of a suitable PSU for UK / EU and US

3. BOM cost reduction and clarifying vendor details

MDAC2 Project:-

1. Approving the Crystals for main oscillators

2. Approving magnetics

3. Approving connectors

4. Approving the new Flexible foil to the front panel

5. Build an incoming IQC test jig to test the Crystals before they are used in production so we dont encounter the same failures as seen on MDAC.

I just purchased a Agilent Network analyser from the Philippines of all places for the production line in China for this purpose - but refuse to pay US$7000 for the extra crystal test adaptor* so I have to design our own test adaptor..

* there is a second hand adaptor on Ebay but its still US$3800 + shipping plus Tax and import duty of 25% give or take...

http://www.ebay.com/itm/Agilent-4190...0AAMXQBwlRNana

6. Updating schematic so Jarek can start work on the SOC PCB / test PCB


FDAC (much the same as MDAC2 as they share many of the same components)

1. Building an Inverses RIAA for production line testing of the phono stage (parts ordered yesterday)

VFET:-

1. Confirm DC servo operation range to balance expected DC offset of 6n23 Tube after confirming Spice models of the tubes in hardware over the weekend.

Please DON'T rush to conclusions - there are commercial reasons I cannot say more about Munich - but Detox and MDAC2 will be available

It upsets me to get such a post as I spend so much of my time currently working on production related issues - I feel relieved once I've cleared the daily Email traffic and questions etc. from Asia and I can finally get back to working on the MDAC2 Design.

As we know what components are used on MDAC2 I have already started the sourcing / vendor / sample approval...

Yesterday I placed a large component order for the MDAC2 prototype PCB (also components for the Inverse RIAA EQ & Crystal test jig)

Oh I forgot to mention not only did I just purchase the Network analyser for the production line at silly money (the crystal adaptor alone would cost used US$3.8K+), but also this week a stereo Microscope for the lab bench as the components on the MDAC2 / FDAC are so tiny - they are really designed for the mobile phone industry so have been shrunk to an almost "human" unusable size... Mosfet packages 0.77mm by 1.7mm (with 3 connection pads to be soldered to the PCB).

So yes - I'm just alittle pissed with a post like this as I've spent every working moment of the day on these projects and have pumped in FAR more funds than I've received in development funding to make these the greatest designs I can... and ironically I'm working everyday on production related support for these designs!
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Last edited by JohnW; 13-12-16 at 04:02 AM.
  #11  
Old 13-12-16, 04:00 AM
JohnW JohnW is online now
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Quote:
Originally Posted by Ian M View Post
My problem at the moment is that I no longer have an MDAC and am feeding my current DAC from a Network Audio Adapter - SOtM SMS-200, so I don't know if the Detox is any good to me at the moment.
Ian,

On a case per case basis (no pun intended) I can loan you a MDAC "shell" for the MDAC2 upgrade if your interested - by Qtys. are limited...

I hope to be able to source some MDAC "old dog units" from the service department which will make for good donor units (from MDAC2 we now only need the front panel + Sleeve).
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  #12  
Old 13-12-16, 04:24 AM
Ian M Ian M is offline
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Quote:
Originally Posted by JohnW View Post
Ian,

On a case per case basis (no pun intended) I can loan you a MDAC "shell" for the MDAC2 upgrade if your interested - by Qtys. are limited...

I hope to be able to source some MDAC "old dog units" from the service department which will make for good donor units (from MDAC2 we now only need the front panel + Sleeve).
Thanks for the offer John but I had no plans to get the MDAC2. I will wait for the FDAC.
  #13  
Old 13-12-16, 04:42 AM
BE718 BE718 is offline
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Quote:
Originally Posted by JohnW View Post
BE718

What makes you say that?

Detox and MDAC2 are the only projects we are working (asides from the mini-streamer test PCB & our "XMOS" USB development PCB to confirm 769KHZ PCM and DSD512 operation, software, clocks and dual 9038 etc).

All will become clear at Munich and the reasons I cannot give more details.

My daily "projects" consist of:-

Detox production updates currently:-

1. Crystals samples approval

2. Approval of a suitable PSU for UK / EU and US

3. BOM cost reduction and clarifying vendor details

MDAC2 Project:-

1. Approving the Crystals for main oscillators

2. Approving magnetics

3. Approving connectors

4. Approving the new Flexible foil to the front panel

5. Build an incoming IQC test jig to test the Crystals before they are used in production so we dont encounter the same failures as seen on MDAC.

I just purchased a Agilent Network analyser from the Philippines of all places for the production line in China for this purpose - but refuse to pay US$7000 for the extra crystal test adaptor* so I have to design our own test adaptor..

* there is a second hand adaptor on Ebay but its still US$3800 + shipping plus Tax and import duty of 25% give or take...

http://www.ebay.com/itm/Agilent-4190...0AAMXQBwlRNana

6. Updating schematic so Jarek can start work on the SOC PCB / test PCB


FDAC (much the same as MDAC2 as they share many of the same components)

1. Building an Inverses RIAA for production line testing of the phono stage (parts ordered yesterday)

VFET:-

1. Confirm DC servo operation range to balance expected DC offset of 6n23 Tube after confirming Spice models of the tubes in hardware over the weekend.

Please DON'T rush to conclusions - there are commercial reasons I cannot say more about Munich - but Detox and MDAC2 will be available

It upsets me to get such a post as I spend so much of my time currently working on production related issues - I feel relieved once I've cleared the daily Email traffic and questions etc. from Asia and I can finally get back to working on the MDAC2 Design.

As we know what components are used on MDAC2 I have already started the sourcing / vendor / sample approval...

Yesterday I placed a large component order for the MDAC2 prototype PCB (also components for the Inverse RIAA EQ & Crystal test jig)

Oh I forgot to mention not only did I just purchase the Network analyser for the production line at silly money (the crystal adaptor alone would cost used US$3.8K+), but also this week a stereo Microscope for the lab bench as the components on the MDAC2 / FDAC are so tiny - they are really designed for the mobile phone industry so have been shrunk to an almost "human" unusable size... Mosfet packages 0.77mm by 1.7mm (with 3 connection pads to be soldered to the PCB).

So yes - I'm just alittle pissed with a post like this as I've spent every working moment of the day on these projects and have pumped in FAR more funds than I've received in development funding to make these the greatest designs I can... and ironically I'm working everyday on production related support for these designs!

Sorry John, but I am not sure how to interpret your comment

"Detox and an undisclosed project - which will be revealed at Munich."

Detox, MDAC2 and FDAC are disclosed projects, unless you are implying the FDAC is morphing into something else - commercial partner?

So another 6 months until detox and mdac2 are available. How many times have we been told this before?

Even then the FDAC still wont be available.

So I have to say, respectfully, that however hard you may be working or aggrieved you may feel that the project is questioned, it is still a distant and uncertain outcome for the rest of us.

Now some may want to continue along for the ride but my decision currently, unless some compelling information convinces me otherwise, is to seek someone to take over my slot.

My best wishes for the project.
  #14  
Old 13-12-16, 05:35 AM
Clerenlas Clerenlas is offline
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Quote:
Originally Posted by JohnW View Post
Clerenlas,

GBP500 of the FDAC development fee transferred to the MDAC2 Development fee & I'll credit you the GBP100 balance to the MDAC2 PCB "At cost".

As a FDAC to MDAC2 Xfer you quality for FDAC at 50% development fee (+PCB at cost) if your still interested in FDAC once it available.
Thanks, John. If the FDAC becomes available before 2020, I might well be interested in the 50% offer. 🙂
  #15  
Old 13-12-16, 06:46 AM
Steven Toy Steven Toy is offline
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Quote:
Originally Posted by JohnW View Post
Clerenlas,

GBP500 of the FDAC development fee transferred to the MDAC2 Development fee & I'll credit you the GBP100 balance to the MDAC2 PCB "At cost".

As a FDAC to MDAC2 Xfer you quality for FDAC at 50% development fee (+PCB at cost) if your still interested in FDAC once it available.
This seems like an option I should wish to pursue. I would have a buyer for the MDAC(2) if it was just the cost of an additional board.

This project had dragged on for longer than is reasonably necessary, IMO but I am not giving up on it yet.
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