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Old 12th September 2012, 01:12 PM   #5311
Phisci is offline Phisci  South Africa
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This is a link to a 3.3V REFLEKTOR:
Salas Reflektor 2011 +3.3V???????: Kon???????
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Old 12th September 2012, 01:31 PM   #5312
Salas is offline Salas  Greece
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Looks like it. The Renesas low Vgs & high Yfs semi tells the lower threshold tale. Should had been easier to oscillate and to had needed the much different Zobel values due to high Crss.
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Old 12th September 2012, 01:39 PM   #5313
Salas is offline Salas  Greece
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P.S. Kazuo-san may post to discuss it & clear the assumptions?
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Old 12th September 2012, 01:47 PM   #5314
Phisci is offline Phisci  South Africa
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Salas, for beginners like myself is there a place where I can read the thinking behind the shunt supplies and REFLEKTOR?
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Old 12th September 2012, 01:50 PM   #5315
Salas is offline Salas  Greece
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Post #4287 in this thread explains the Reflektor and has some history of its older roots.
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Old 12th September 2012, 02:20 PM   #5316
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Quote:
Originally Posted by Salas View Post
Looks like it. The Renesas low Vgs & high Yfs semi tells the lower threshold tale. Should had been easier to oscillate and to had needed the much different Zobel values due to high Crss.
Can you please suggest Zobel values?
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Old 12th September 2012, 02:24 PM   #5317
Salas is offline Salas  Greece
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Kazuo-san used that Mosfet type to go 3.3V he certainly tested those values in his schema. If he will post he will explain further I suppose but he already mentioned that a quad of those regs are @ work in his latest Sabre DAC build.
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Old 12th September 2012, 02:44 PM   #5318
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Quote:
Originally Posted by Phisci View Post
Salas, for beginners like myself is there a place where I can read the thinking behind the shunt supplies and REFLEKTOR?
The grand-daddy of shunt regulator articles:
http://waltjung.org/PDFs/Dont_Shun_t..._Regulator.pdf
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Old 13th September 2012, 02:39 AM   #5319
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Quote:
Originally Posted by Salas View Post
P.S. Kazuo-san may post to discuss it & clear the assumptions?
The Sabre DAC seems to be working well for me. But I have only poor oscilloscope. It is possible that I can not observe osc.

When I move the position of the reg. board, it may sometimes oscillate obviously.

Honestly saying, I have no confidence the value of Zobel. I would like to wait for diyer's suggestions.

Attaching is the latest version.
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File Type: png Salas Reflektor(+3.3V)6th.png (30.3 KB, 487 views)
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Old 13th September 2012, 03:41 AM   #5320
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Sorry, this is the latest schematic.
And now I don not use four wires(F&S). Next step I will try.
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File Type: png Salas Reflektor(+3.3V)6th.png (30.6 KB, 484 views)
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