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Old 7th January 2017, 05:33 PM   #971
Salas is offline Salas  Greece
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Quote:
Originally Posted by wyan View Post
Hi, if I am using ref-D mini's to power +/-5V for the analog part of DAC, do I need to have J2 with close or same IDSS? Thanks
Close within 1mA idss would be nice so the Yfs characteristics are alike, but true matching is not necessary.

If you got build pictures would be nice to see by the way. We have no Mini's builders pics in the thread I think.
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Old 8th January 2017, 05:43 AM   #972
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Originally Posted by Salas View Post
Close within 1mA idss would be nice so the Yfs characteristics are alike, but true matching is not necessary.

If you got build pictures would be nice to see by the way. We have no Mini's builders pics in the thread I think.
Hi, Salas,


Thanks. I will post some photos when the board is populated. Need to find out the IDSS of my SK117GR's first. Cheers.


WYAN
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Old 11th January 2017, 07:17 PM   #973
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Hello Salas,

It seems that the 2SK117GR is obsolete. What can I used instead for the J1 and J2?
Thank you !
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Old 11th January 2017, 07:33 PM   #974
Salas is offline Salas  Greece
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2SK880GR

There are SMT pads for J1 in the REF-D and for J1 & J2 in the REF-D MINI

There are also mini boards converters from SMT to through hole on Ebay etc
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Old 12th January 2017, 05:51 PM   #975
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Originally Posted by Salas View Post
2SK880GR

There are SMT pads for J1 in the REF-D and for J1 & J2 in the REF-D MINI

There are also mini boards converters from SMT to through hole on Ebay etc
Thank you for your answer Salas, I just ordered parts for two boards: 5,5V and 8V.
Because it is a school project I must do the PCB myself, so I want to make all the improvements possible - and I have 2 questions:
1)when using the J2 mode, it is enough to connect G to S or I could use an RR resistor like on the J1 based on the IDSS ?
2) in this thread I found that using a 1,5mH choke before the 10000uF cap improved the filtering. Should I also put a 3300uF cap before the choke to make a CLC filter or this is a overkill ? Or both are overkills ?

Thank you !
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Old 12th January 2017, 06:13 PM   #976
Salas is offline Salas  Greece
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1) Its enough when with between 2-4mA Idss parts

2) Filtering is good extra in general but simulate in Duncan PSU free software before to be smooth rising edge and acceptable voltage loss
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Old 12th January 2017, 06:32 PM   #977
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1) Its enough when with between 2-4mA Idss parts
Do you mean to look after a J2 that has IDSS 2-4mA or that the difference between J1 IDSS and J2 IDSS should be 2-4mA?
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Old 12th January 2017, 07:35 PM   #978
Salas is offline Salas  Greece
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J2 IDSS
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Old 13th January 2017, 03:29 PM   #979
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Sorry for bothering with so many questions, but:
1) Can I a use a more powerfull N MOS with less Rds on like RFP70N06?
2) Can I use a more powefull P MOS with less Rds on like FQP27P06?

Thank you !
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Old 13th January 2017, 03:54 PM   #980
Salas is offline Salas  Greece
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Rds on is not relevant in this circuit because its not a switcher
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