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In Reply to: RE: Power Supplies posted by fmak on October 25, 2010 at 19:08:20:
Howdy
Unfortunately tonight at a friend's house I could hear a difference when plugging my DAC into a magic outlet on an Equi=Tech trunk vs. a generic outlet :( Using the Equi=Tech outlet revealed a tiny bit of haze in the high frequencies. Since the board is already floating and the balanced power shouldn't matter it must be some grunge on the power line that's leaking thru my supplies. On the other hand he can hear a difference with every piece of gear he has and his gear isn't cheap :)
I should have posted a more thoughtful response to your ALW suggestion: I agree with essentially everything you say about them but
1) I was doing my own board for my own learning experience
2) these are my 2nd attempts at power supplies, on the last board I still used 723 based supplies but they were all over the map on accuracy, let alone that they have a low bandwidth (which can be good for this purpose) and I had to backstop them with bulk, local and bypass caps.
The ALW's didn't seem like a good match for me on a few fronts:
1) not surface mount
2) no good spec on the current output (I need approx 500mA for each analog supply and about 800mA for the ECL (tho it could be split...) and 300mA for the FPGA/CMOS.)
3) they specifically warn against having the amount of capacitance that I consider necessary after their regulator. In my quick and dirty simulations modeling ideal power supplies as a dirty voltage source thru an inductor and a resistor I found that even with very low impedance in the lower freqs I needed serious bypassing/local bulk at 22MHz to keep my THD down. Getting supplies/bypassing that could get the resultant THD down far enough took a lot of work.
4) NIH :)
That isn't to say that I don't use similar quality components with some bootstrapping, etc. but I'm sure that AW or WJ could easily do better than me at power supplies.
-Ted
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Follow Ups
- Oh, well - Ted Smith 22:44:53 10/25/10 (5)
- RE: Oh, well - rick_m 06:10:20 10/26/10 (1)
- RE: Oh, well - Ted Smith 07:57:49 10/26/10 (0)
- RE: Oh, well-everything counts - fmak 02:27:37 10/26/10 (2)
- RE: Oh, well-everything counts - Ted Smith 07:24:09 10/26/10 (1)
- RE: Oh, well-everything counts - fmak 08:09:13 10/26/10 (0)
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