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Every part would have to be "quantum purified", kissed by a virgin and blessed by a priest, and even then, $500 max. Steve
Sure does look familiar. Some of the capacitors they replaced with OSCON SEPC caps on the stock board went into positions where the stock caps were 20V and some maybe 25V, however the data sheets for the OSCON SEPC series shows a max rating of only 16V. Wonder if they will last long, unless the stock caps are over-rated to begin with. Wow, they also sell "quantum purified" digital cables.
Apparently the Mojo Audio mods include major changes to PS, including supplying 40k uf. Can that much extra power be of benefit for a DAC?
Hm. $2500 AD1865-based DAC. http://www.mojo-audio.com/AD1865NOS-D-A-Converter-AD1865NOS.htmIf you enlarge the interior photos, that board suuure does look familiar!
I've often wondered how robust a power supply needs to be for a DAC. I don't know if it's a numbers game or not, but Audio-gd uses > 50,000 uF capacitance in their DACs and Wyred 4 Sound use 88,000 uF in their DAC1/DAC2. I'm guessing that the DAC and receiver chips are very sensitive to DC ripple and can benefit from the large capacitance for smoothing as opposed to needing it for energy reserve. Steve
Plan to embrace the AD1865K project in the next few months. Based on the read, I'd need the following items to make a stock DAC work:- Power Switch (DPDT) (Do I need a fuse?) - RCA jacks for output- Do I need a jacket for Coaxial? Is that the same as RCA jack? Did it come with the kit?- Some wires.- LEDs - can I wire LED to the board so I know the machine is on?I plan to use my old pioneer universal dvd player as the transport with a coaxial out to the DAC for two channel music. I might add a USB to coaxial converter later if I see the improvement vs. the old pioneer player. I will put these on a MDF board first. Might add a metal enclosure if I like it. Did I miss anything?
I want to do the ad1865k shortly. I have never had a dac before but I do know I will also need some kind of source. What type of source or transport will i need to play cd's. Will a blu ray have appropriate out? Obviously I am new to this Thanks
Another option that I wish existed before I bought my dac is this:
I looked at this one and I'd really love to build one. But, but, but, it's not for beginners and the cost will be higher I guess... Not really know how to manage it. There are many interests in DAC End but very few build thread that I can locate...For example, the kit (http://quanghao.com/product.php?id_product=1) is $350. Does it come with Salas?
No, not for beginners. The completed board you linked is the same board, so yes it's the Salas PS.Should not be too expensive though w/ the rainbow IV instead of the quanghao tube version. Probably $300 or less.For anyone comfortable with a soldering iron, though, I think it's a great deal.
$300 or less? I thought the kit costs $350. Do you mean that buying the PCB and BOM yourself out? I haven't tried that yet but $300 or less I am a bit comfortable with. Do I still need a two stage Transformer for the DAC End?
Yes, just buying the PCB and getting the parts yourself. Don't quote me on that as I have not actually calculated the BOM, just guesstimating.No, you're transformer needs may be more complicated, depending on what you choose for the IV stage. In your case, unless you're really up for it, I would stick with the rainbow kit... argh, i mean raindrop.
I have just replaced the Panasonic FCs in the AD1865 DAC w/ Os-cons, and clearly it's what I should have done in the first place; the 'dark' sound is all gone and what I am hearing now is really, really good.
I have replaced the diodes by the power supply w/ fast 1A Schottkys
swapped out half the resistors in the I/V stage for PRPS and dales and half the caps for Elna Silmic II.
Hey! I have this DAC in my system right now. Bought from this seller, great seller by the way. This DAC use 4 TDA1543 DAC chips running in paralleled. The output come directly off those chips. There is no opamp or buffer after the DAC chips. Simple! I like it. The DAC uses lot of good quality component despite the price. Still I only did 2 upgrades to it. 1. Changed diodes to Schottky type 2. Changed the output caps (22uf) to Russian K73-16 22uf 63V with Jensen PIO Copper as by pass caps. Definitely the output cap upgrade made the biggest improvement. The stock caps sounds horrible. But I know NOS DAC so that was the first thing I looked at to upgrade. So far a great NOS DAC. But not for everyone. It won't do detail especially in the high like 24/96+ DAC. But I'm a fan of NOS DAC of which I feel sound more analog playing Red Book CD I found most 24/96+ DAC sound unease especially in the high that sometime can sound hyper unnatural. Of course they are some exception of good 24/96+ DACs out there. Anyway, I will take some pictures and post them here soon. Take care,Buddy