The simplistic Salas low voltage shunt regulator - Page 574

samoloko · 10:54 AM

Salas

I would like to try Reflektor powering 5V digital at dac
would you please advise which Is most actual schematic to use
that one from october 2011 http://www.diyaudio.com/forums/attac...kt_squeeze.gif or The simplistic Salas low voltage shunt regulator from october 2012
Which shunt MosFet Is recommended for 5V dc out IRF640 or STP55NF06L
what values do you recommend for gate stoppers resistors 220, 150, 100
which type metal film of carbon

Salas · 18th February 2013, 12:18 PM

Do the second one as it is more refined after tests and talk. Use the STP55NF06. Even not the L version when not going under 5V which is much easier to find. Values are on the schematic, use metal film and keep leads towards gates very short.

samoloko · 18th February 2013, 01:19 PM

thank you
Is there a down side to use L version of MosFet for 5 Vdc as I like after that to make a 3.3V regulator
just one more question - how can I set V ref to output 5Vdc - setting zener and resistor In series which are parallel to 2 x 820 uF or just resistor

Salas · 18th February 2013, 03:12 PM

No down side. Just future proof for 3.3V and more expensive and rare to source. Its a red LED and a trimmer. You just turn the trimmer. For 3.3V its a diode.

samoloko · 03:45 PM

thank you

do I need additional 2N4401 transistors like here The simplistic Salas low voltage shunt regulator
Is output zobel polypropylene cap the most determinant to sound quality - Is a teflon a good choice

Salas · 19th February 2013, 12:06 AM

No, that twist was for really low 1.2V. The bypass lytic(s) and the Zobel cap are indeed influential but not determinant. Choose by your own liking some with balanced price and quality.

samoloko · 19th February 2013, 07:04 AM

why sk117 GR Is preferred to sk170 BL In CCS chain - lesser capacitance ?
Is It so Important

Salas · 19th February 2013, 10:04 AM

Surely less capacitance and the current range we opted for. BF245A also. If you got K170GR ~4mA or BL to cut its current down with a resistor you can go by presumably.

samoloko · 19th February 2013, 10:48 AM

I will use K170 BL with resistor
why you choose 4 mA

Salas · 19th February 2013, 10:50 AM

To work the specific BJT in a good region.

18th February 2013, 10:47 AM	#5731
samoloko diyAudio Member Join Date: Jun 2006	Salas I would like to try Reflektor powering 5V digital at dac would you please advise which Is most actual schematic to use that one from october 2011 http://www.diyaudio.com/forums/attac...kt_squeeze.gif or The simplistic Salas low voltage shunt regulator from october 2012 Which shunt MosFet Is recommended for 5V dc out IRF640 or STP55NF06L what values do you recommend for gate stoppers resistors 220, 150, 100 which type metal film of carbon Last edited by samoloko; 18th February 2013 at 10:54 AM.

18th February 2013, 03:35 PM	#5735
samoloko diyAudio Member Join Date: Jun 2006	thank you do I need additional 2N4401 transistors like here The simplistic Salas low voltage shunt regulator Is output zobel polypropylene cap the most determinant to sound quality - Is a teflon a good choice Last edited by samoloko; 18th February 2013 at 03:45 PM.

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18th February 2013, 12:18 PM	#5732
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Do the second one as it is more refined after tests and talk. Use the STP55NF06. Even not the L version when not going under 5V which is much easier to find. Values are on the schematic, use metal film and keep leads towards gates very short.

18th February 2013, 01:19 PM	#5733
samoloko diyAudio Member Join Date: Jun 2006	thank you Is there a down side to use L version of MosFet for 5 Vdc as I like after that to make a 3.3V regulator just one more question - how can I set V ref to output 5Vdc - setting zener and resistor In series which are parallel to 2 x 820 uF or just resistor

18th February 2013, 03:12 PM	#5734
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No down side. Just future proof for 3.3V and more expensive and rare to source. Its a red LED and a trimmer. You just turn the trimmer. For 3.3V its a diode.

19th February 2013, 12:06 AM	#5736
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No, that twist was for really low 1.2V. The bypass lytic(s) and the Zobel cap are indeed influential but not determinant. Choose by your own liking some with balanced price and quality.

19th February 2013, 07:04 AM	#5737
samoloko diyAudio Member Join Date: Jun 2006	why sk117 GR Is preferred to sk170 BL In CCS chain - lesser capacitance ? Is It so Important

19th February 2013, 10:04 AM	#5738
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Surely less capacitance and the current range we opted for. BF245A also. If you got K170GR ~4mA or BL to cut its current down with a resistor you can go by presumably.

19th February 2013, 10:48 AM	#5739
samoloko diyAudio Member Join Date: Jun 2006	I will use K170 BL with resistor why you choose 4 mA

19th February 2013, 10:50 AM	#5740
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	To work the specific BJT in a good region.