DAC

david62 · « **on:** 18 Mar 2010, 06:45 pm »

Is it possible to use the DAC separately with a power supply and run the audio output directly into a Clarinet linestage? Thanks,
Dave

harryf · « **Reply #1 on:** 18 Mar 2010, 08:27 pm »

yes but i'm not sure where you would find a -12 v power supply.I looked and could not find one or plan's for one either.I'm no expert so maybe there is a simple solution.I don't know?

Yoda · « **Reply #2 on:** 18 Mar 2010, 08:54 pm »

You could probably use the Bugle power supply kit (+15v/-15v) and drop the output voltage to 12.

Brinkman · « **Reply #3 on:** 18 Mar 2010, 09:09 pm »

The Bugle power supply can manage +/- 15V @ 100mA. The DAC daughtercard requires +/- 7.5-15V @ 150mA. Not sure how the DAC would run on 67% of it's required current. Might be aright.

harryf · « **Reply #4 on:** 18 Mar 2010, 11:05 pm »

Everything i have ever read on cd player's and dac's is they need a stout power supply to sound best.Greatg cap's large trannie etc.Running less than a great ps to me sound's counter productive.

david62 · « **Reply #5 on:** 19 Mar 2010, 01:27 am »

Since I'm not a E.E., I would need to know exactly how to build a proper power supply for that DAC board.I would also need to know how best to couple the audio output into the Clarinet.I seems like it might be good concept.

Yoda · « **Reply #6 on:** 19 Mar 2010, 03:52 am »

Brinkman - good point. david - does seem like a good concept once you work out the PS -look to the chime schematic for PS to the card... but you could be getting close to building a chime...which may be worth it!

david62 · « **Reply #7 on:** 19 Mar 2010, 12:29 pm »

Would it not be much easier to build a power supply and use the DAC with the Clarinet?Since I'm not a E.E.,I would leave that to the experts.

poty · « **Reply #8 on:** 19 Mar 2010, 02:36 pm »

What is "the DAC"? Maybe I missed something. As far as I know the site hagtech.com offers:
- the circuit in HagUSB which can be treated as DAC (power supply 3.3 V)
- the Ripper's circuit (power supply schematic exists and there is +/-10V)
- the Chime (all schematic exists)
About what "DAC" we discuss here?

david62 · « **Reply #9 on:** 19 Mar 2010, 08:42 pm »

The PC board is the one sold on the Hagtech web site.

Yoda · « **Reply #10 on:** 20 Mar 2010, 12:44 am »

http://www.hagtech.com/hagdac.html

jameshuls · « **Reply #11 on:** 20 Mar 2010, 02:51 am »

This is a great idea! I was just wondering yesterday if the chime could be made into a linestage, but an old post responded to by Jim H indicated it is not practical. I never thought of the Clarinet as a linestage w/DAC. Now the wheels are turning - I see my next project! Either that or the Clarion 2A3 SET. Of course, it needs a preamp to be used so the next logical step is the Clarinet... with DAC! I guess I better finish my ongoing projects first of course...

david62 · « **Reply #12 on:** 20 Mar 2010, 12:33 pm »

James,

Do you already have a Clarinet? If a first rate power supply was made for the DAC board and it was output to your Clarinet,would you not have a top shelf DAC that could be built pretty easily?
Dave

poty · « **Reply #13 on:** 20 Mar 2010, 05:44 pm »

If we speak about Chime's daughterboard:
1. It is mentioned in the manual that it could be used by himself (i.e. directly connected to an external linestage) if there is appropriate power supply. Then you can only have S/PDIF input(-s).
2. You can borrow the power supply from Chime's shematic, but you have to breadboard it or make your own PCB. Another option is to find good stabilized power supply from other projects. There are a lot of them in the Internet (and eBay too).

david62 · « **Reply #14 on:** 20 Mar 2010, 05:55 pm »

Who wants to go first?

dnewman · « **Reply #15 on:** 21 Mar 2010, 03:33 am »

When I built a HagDac directly into a Transcendent Sound Grounded Grid pre-amp, I simply duplicated the +/- 8V DC power supply from the Chime. Has worked great for nearly four years now.

Mind you, I love my two Chimes. However, I wanted a slightly more sterile -- less 2nd harmonics -- tubed DAC for listening to harpsichord and some other types of music. Hence my wedding a HadDac to a GG with the GG +30dB gain mod.

I even have two PCBs left over which I used as carrier cards for the HagDac: they have the S/PDIF input, +/- 8V input, L & R outputs, plus circuitry for rolloff and phase switches and the bi-color PLL & RCV LEDs.

Separately, I built a PCB to provide ground isolation for two electrical S/PDIF inputs as well as two TOSLINK inputs. (Not becasue I like TOSLINK. Rather I wanted to see for myself how good/bad it is.) For USB input, I just used a HagUSB card. Finally, I hand wired a board to get the needed +/- 8V DC. I think I still have two of the signal handling PCBs around as well, but the PSU PCB was a one-off if I recall correctly.

Dan

david62 · « **Reply #16 on:** 21 Mar 2010, 10:56 pm »

Dan,

That doesn't sound too complicated.It would be nice to have a power supply board and a parts list...

dnewman · « **Reply #17 on:** 25 Mar 2010, 03:38 am »

Well, to get you started on a power supply board and parts list, refer to the Chime schematics. It's the second page of schematics, labelled "Constructor: Chime Power & I/O". You're interested in the power supply along the top edge of the schematic starting with T400 and ending with R411 & R412. Parts list as per those parts in the Chime's parts list.

Dan

david62 · « **Reply #18 on:** 25 Mar 2010, 03:40 pm »

It seems like it would be a worthwhile project.What kind of transformer and chassis did you use?

david62 · « **Reply #19 on:** 25 Mar 2010, 03:46 pm »

I see that the transformer is on the schematic and on the parts list for the regulated +/- 8 volt power supply.
David