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Old 14th June 2006, 11:09 PM   #21
mr-mac is offline mr-mac  Scotland
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Only thing regardless of the DC being in mains or battery the Da-capo battery light doesn't come on... Now I know battery is working as I can hear the diffrence but I wondered if you can remember if there is a pin on the DC psu card for the da-capo that signals the battery being on (I think 1 solder joint may be loose???
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Old 15th June 2006, 04:24 PM   #22
JohnW is offline JohnW  Hong Kong
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Hi John,

I'm very glad to hear that you appreciate the benefits of the “DC”. I remember that Hi-Fi World did a review of the Dacapo with the “DC”, and felt that the DC only offered a small benefit….. Personally like you, I found the difference enormous, and would never return to using a Dacapo without the “DC”.

I’ve just relocated to China, and my DC is still in shipping, so I will have to work from fading memory.

The Dacapo has two control lines between the DC: -

1. Control line FROM Dacapo to DC to Enable “Battery mode” – this is logic “AND” with Signal-Lock & Standby within the Dacapo.

2. Signal line FROM DC to Dacapo to indicate Battery mode on the following conditions: -

a. Digital Signal Lock
b. Dacapo switched on
c. Switch on “DC” selected to Battery mode
d. Battery’s in a Charged State.


The Batteries are always connected to the Dacapo – only that during “Charging” the batteries / Dacapo are not isolated from the mains Charging circuit – so even if the “Battery” LED is not lit on the Dacapo, you will still gain the benefit of the DC PSU.

You should check the DC voltages on the Battery Cells, each fully charged “bank” should be around 13.7V – if less then say 12.5V, then maybe you have worn cells – the life expectancy of the Battery cells is about 5 Years….

You could try selecting the Switch on the DC front panel, if you hear the Relays "Click" within the DC, then the DC is fully operational, and have a problem with the Dacapo "Battery" LED indication circuit..

Hope this helps,

John
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Old 15th June 2006, 04:49 PM   #23
mr-mac is offline mr-mac  Scotland
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The batteries, I belive, were changed 18months ago..... If I press the button on the DC the mains light goes out on the DC (to me meaning it's on batteries???? think I heared the relays switch). yesterday, after a good long audition the mains light automatically switched back in).

The DC automatically detects either the Da-capo or cardinal being turned off and auto switches from no light being displayed to the mains light being displayed.

i think the signal line from DC - Da-capo has a broken solder joint thus meaning the Da-capo isn't getting the signal from the DC to switch the light on.....

I think the broken solder joint is on the connector that the DC PSU module (the one installed inside the Da-capo) connects to the main Da-capo circuit board. (if looking directly at the connector on the PSU module I reckon it's on the left hand side of the connecter and the wire that connects to the underside of the circuit modules circuit board.

in fact the solder on this connecter is terrible, very messy and untidy (the previous owner says it must have been like that from factory as he has never had it repaired). I don't doubt this as batteries were changed when he said (according to sticker inside) and the rest of unit is in very good condition. it would mean though for some reason this connecter was de-solder and re-soldered badly by hand before it left Pink Triangle.... again why I suspect the problem lies on that card.

I will double check later if I can hear the solenoid and maybe measure the batteries voltage if I can't hear it....

But the fact that i can identify 100% correctly in 10 goes blindly whether the DC was running on Batteries or AC due to the improvement in sound quality when on pure batteries makes me sure the batteries are actually working ok.

Thanks

John
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Old 15th June 2006, 05:08 PM   #24
mr-mac is offline mr-mac  Scotland
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Mean to say I have a photocopy of a review, can't remember the magazine but they were very impressed with Da-Capo and as impressed again with DC at least if I correctly remember. You are very, very welcome to a copy of it...

Still IIRC the Hi-fi world only had the 18bit filter IIRC (which may not have resolved as much obvious improvement with the DC)....

Funny though as their review list only shows Da-capo and Cardinal no DC.

Still from the words of David Price (Hifi World editor) - he still reckons it is one of the Best Dac's he has ever heard (that's with 18bit and std AC).... He mentioned even Noel Keywood (Owner and Ex-Editor of Hi-fi world) who apparently hardly ever has anything good to say about any digital products) waxed lyrical about the Da-Capo's ability.... They used the Da-capo as one of the magazines benchmark DAC in reviews for a good number of years.

John
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Old 16th June 2006, 09:08 AM   #25
JohnW is offline JohnW  Hong Kong
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Hi John,

Yes - sounds like the joints on the connector need re-soldering.

As it appears your DC goes into "Mains" mode after a time, that the DC is working.

What filter do you use? In order of preference I prefer:-

1. HDCD (PMD100)

2. Yamaha YSF210

3. 24 Bit filter

4. 18 Bit Yamaha

5. 1307 - don't bother

6. 20 Bit - don't bother

The HDCD and 24 Bit are close until you listen to material with Bass - the HDCD wins hands down. We have been investigating why the HDCD is so good - with interesting results...

In the next coming months I will have a new filter based upon a FPGA available for internal research (we can always make a few more if anybody’s interested).....

John
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Old 16th June 2006, 12:09 PM   #26
mr-mac is offline mr-mac  Scotland
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I have the HDCD one

DP at hi-fi world thinks the FPGA has a lot of mileage in it for digital audio applications and thinks it was used to great effect in the new Chord DAC (also pointed last month in the letters section to all the FPGA based digital he has heared sounding considerably diffrent to most off the shelf chip based digital)...

I take it the FPGA filter module will allow it to be connected and updated through a computer so diffrent filters could be emulated and the ultimate filter configuration for the Da-capo to, over time, be found

Do FPGA's have any other advantages in audio over an off the shelf chip? (apart from being able to program them to do what you want)

Sounds very intresting (I still need to track down some more input cards so I can get the use of the DAC on some other sources).

I wonder how much extra the DC'd da-capo would shine with DAT or other 48khz source?

Infact if it could be fed by some sort of combination of the HDCD coding with DAT's 48khz (be nice for record archiving) and I bet it would sound not just better than anything else produced but probablly better than the next hi-res format as well)....

I wonder would it be possible to build an HDD based audio transport that could feed HDCD coding at 48khz and clock lock? ach I am just getting carried away now....

John

PS do you mind me asking what your results were re the HDCD winning in the bass? I know the PMD100 is a really good chip (did LINN CD12 not use that or the PMD200, I know a whole host of other very expensive esoteric designs used those chips as well)
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Old 16th June 2006, 01:18 PM   #27
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Quote:
Originally posted by JohnW
In the next coming months I will have a new filter based upon a FPGA available for internal research (we can always make a few more if anybody’s interested).....
Hi John,

Serious ???

Count me in !!!

(if the price stays in a decent range and it's not BGA, for a diy soldering)

Thanks a lot for the proposal
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Old 22nd June 2006, 09:51 PM   #28
mr-mac is offline mr-mac  Scotland
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Defo intrested in the FPGA filter....

Also wondered I have recived a 2nd D.I.C. today (also a clock & digital twin co-ax one)...Can the dual co-ax one be used for non clock locked equipment as well as the Cardinal???

I was also intrigued at to why there was a AEL clock on the input card as I thought from somthing you siad before the clock in the da-capo was kept as close to the DAC as possible??? Is this a secondary clock of some kind???

Lastly I wondered if the AEL clock (if it is the master clock) or whatever type the master clock is was a high quality one (as trichord had told me they were fairly low quality, though they are trying to sell a clock uograde)....

Thanks Again

John

PS Maybe if someone has a spare single digital or optical D.I.C they may want to swap me for a D.I.C with clock lock on it
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Old 19th September 2006, 01:57 PM   #29
mr-mac is offline mr-mac  Scotland
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Hi John,

Was just wanting to check if your plan for an FPGA filter had any update or news yet??? I know you are busy, just thought I would check in.

Cheers

John

PS I still have a spare Dual Coax Digital Input Card up for a swap with a singal co-ax or optical one if anyone has a spare
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Old 3rd October 2006, 07:30 AM   #30
JohnW is offline JohnW  Hong Kong
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Hi Mr. MAC,

Sorry for the late reply.

PCB design is completed for the new digital filter; the new filter will also come with a new input board (2 slots wide) to support DSD and up to 192 KHz PCM input - compatible with both the Ordinal and Dacapo.

The filter board will support native DSD - compatible with 3rd party’s DVD player upgrade boards, that allows access to the RAW DSD data stream.

The SAA7350 modulator is only fitted for development to allow comparisons with our new modulator designs; it will not be fitted on production modules.

Guess we will start sending out filter + input boards in 2 months, these will be available at "cost", I'm not interested in making money on this project, just to breath new life into my old designs.

John
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