The simplistic Salas low voltage shunt regulator - Page 532

Phisci · 12th September 2012, 12:12 PM

This is a link to a 3.3V REFLEKTOR:
Salas Reflektor 2011 +3.3V???????: Kon???????

Salas · 12th September 2012, 12:31 PM

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.

Salas · 12th September 2012, 12:39 PM

P.S. Kazuo-san may post to discuss it & clear the assumptions?

Phisci · 12th September 2012, 12:47 PM

Salas, for beginners like myself is there a place where I can read the thinking behind the shunt supplies and REFLEKTOR?

Salas · 12th September 2012, 12:50 PM

Post #4287 in this thread explains the Reflektor and has some history of its older roots.

Joshua_G · 12th September 2012, 01:20 PM

Quote:

Originally Posted by Salas

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?

Salas · 12th September 2012, 01:24 PM

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.

jackinnj · 12th September 2012, 01:44 PM

Quote:

Originally Posted by Phisci

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

Kazuo Ozawa · 13th September 2012, 01:39 AM

Quote:

Originally Posted by Salas

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.

Kazuo Ozawa · 13th September 2012, 02:41 AM

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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12th September 2012, 12:12 PM	#5311
Phisci diyAudio Member Join Date: Aug 2012	This is a link to a 3.3V REFLEKTOR: Salas Reflektor 2011 +3.3V???????: Kon???????

12th September 2012, 12:31 PM	#5312
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

12th September 2012, 12:39 PM	#5313
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	P.S. Kazuo-san may post to discuss it & clear the assumptions?

12th September 2012, 12:47 PM	#5314
Phisci diyAudio Member Join Date: Aug 2012	Salas, for beginners like myself is there a place where I can read the thinking behind the shunt supplies and REFLEKTOR?

12th September 2012, 12:50 PM	#5315
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Post #4287 in this thread explains the Reflektor and has some history of its older roots.

12th September 2012, 01:24 PM	#5317
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.