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Peter Daniel 22nd September 2002 03:44 PM

The mods never end, adding Goudreau's triplets
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After reading Pete Goudreu article about bypass caps I decided to do it in my DAC as well. I used 15nF X7R , 330nF X7R chip caps 0612 from DigiKey and Panasonic 120u HFQ. Mounting and stacking those tiny cap is not an easy job.;)

Peter Daniel 22nd September 2002 03:49 PM

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Panasonic HFQ caps are mounted on the opposite side. So what's the improvement? My DAC already had a pretty good sound and it was better than my TT. By adding the caps I achieved another level of refinment (although not something that blows me off). It's just that reproduced music becomes slightly more real, the notes seem to be floating longer in the air and there is a bit more magic in performance. ;) The cost is not much and it took me an hour to do, so I would recommend it. The chips visible here are 2 stacked 1704 DACs. The shielding brought a big improvement.

Peter Daniel 22nd September 2002 03:55 PM

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This is the look of main board which came from David Broadhurst. I placed damping material on most caps. However, I noticed that too much damping kills the liveness of music, so eventually I removed some of it. Damping the clock was really important on my board. I tried to put damping pads on top panel, but it sounds better without damping. So my recommendation is to experiment, because one never really know what's good and what's not.;)

jleaman 22nd September 2002 04:06 PM

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now if you had a soldering iron like mine it would have probably been alot easyer.

: O )

Peter Daniel 22nd September 2002 04:26 PM

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Yeah, too bad I had to use this one.;)

jleaman 22nd September 2002 04:49 PM

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THATS HUGE now mine is stil smaller

Peter Daniel 22nd September 2002 04:51 PM

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I was only joking. I used 15W temp reg. iron. I usually use 4 different irons . The one before is 80W and is good only for big jobs, like soldering 14 ga wire etc.

The problem with chip caps was not that much soldering as positioning them properly and holding in place.

jleaman 22nd September 2002 04:54 PM

Yeha i know i need to get a new one too i like my weller ill be getting another temp controled one soon i need a bigger tip for soldering big wire and removeing parts off of boards.

jwb 22nd September 2002 06:15 PM

Did you get any resonance from stacking two chips of different capacitance in the same form factor? In my experiments this is sometimes the result, so I have taken the practice of using decreasing sizes for decoupling. For example, 4.7µF in 1206 in parallel with 0.1µF in 0805 for local decoupling.

Peter Daniel 22nd September 2002 06:20 PM

It didn't cross my mind. 0612 package is preferred and when I was ordering, those were the only sizes available from DigiKey. BTW, it was the first time I did something like that so my experience is limited.;)

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