Kevin's analog output stage for current output dacs.

K&K Audio / Lundahl Transformers

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Hi Kevin, How goes it?
Anyway...thanx for the 1673 chokes, I'm currently building the espressivo linestage/headphone amplifier by Gary Dahl, and boy are they might heavy chokes!
Knowing your propensity for the wonderful parallel feed configurations, I have been eyeing your parallel feed LL1674 based analog output stage for current output dacs. The dac I am looking at right now is the AD1955 seen in the Phillips 963SA SACD/DVD player. How close are you to developing a PCB for your analog output stage? Will the power supply seen on the schematic (except for the transformer) be part of the circuit board? What is the analog supply voltage requirements? Will you be able to supply just the circuit board and LL1674's instead of the whole gamut including parts?
The other ideas I have been tossing around is using Norman Tracy's SSPS power supply which are configurable from anything like +5V for the DAC section to +/-12V or +/-18V for the analogue sections along with LC Audio's Lclock2 (or Superclock 2)at 33.XXX MHZ for the 963SA. That way I could use Norman Tracy's SSPS for your analog output stage (if you don't plan on putting the power supply on your circuit board), for the DAC supply and also for the LC Lclock2. Now that is a whole lot of supplies, and the the 963SA isn't exactly a very big player but I'll have to buy one and investigate.
Compared to replacing opamps, and multiple capacitors in the analog output stage, the method above (i.e. using a separate analog output stage) seems simpler, since literally all you need to do after building the output stage on a separate pcb is connect wires to the DAC where the +/- left and right outputs are. Upgrade the main filter capacitor in the switching supply (for the video sections I guess...) and diodes to Schottky and you should be in business.
Let me know if it sounds far fetched and how far you are along with making that Analog output stage PCB available. Moreover the discussion above can apply to almost any cd player as long as it uses current output dacs. Too bad my ageing Pioneer DV525's PCM 1716 isn't a current output dac.
Anand.

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The Cable Cooker

Topic - Kevin's analog output stage for current output dacs. - AnandR 07:31:03 07/02/03 (7)

PC board available - KevinC 16:16:55 07/02/03 (6)

Re: PC board available - akltam 20:45:11 07/21/03 (1)

Re: PC board available - KevinC 16:26:39 07/22/03 (0)

about the actual design... - AnandR 18:25:25 07/02/03 (2)

Re: about the actual design... - KevinC 19:09:31 07/02/03 (1)

My bad... - AnandR 20:21:49 07/02/03 (0)

Re: PC board available - AnandR 17:58:58 07/02/03 (0)

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