Building a symmetrical psu B1 buffer - Page 49

udailey · 21st November 2009, 05:35 AM

Phil
Spencer has gobs of them. They are real. He is in Hong Kong. I think its $37 for 100 which is a steal. Just search DIYaudio for 2sk170 and he will be in first ten hits in the marketplace.
Uriah

Salas · 21st November 2009, 06:47 AM

Hey, don't drain the pool if 100's aren't to be used. The guy sells matched pairs too.

In Germany, easy for EU members http://www.hifituning24.de/0000009b2...b340c28bce.php

Tea-Bag · 21st November 2009, 12:34 PM

Company Store and I beleive andrewT has some matched one's for sale.

Tea-Bag · 21st November 2009, 12:36 PM

Can I get people who have not received their boards still to send me a private message?
Trying to get a feel for where we are at. I expect they should all be there by the end of the month. Everyone in the states should have theirs (one exception).

Thanks!

jean-paul · 01:01 PM

Quote:

Originally Posted by Tea-Bag

Everyone in the states should have theirs (one exception).

Don't tell me that person is you !

BTW after having been busy for too long with pairing FETS and LEDs I just built one with yellow unmatched LEDs and Jfets with 7,5 mA ( upper ) and 8,8 mA ( lower ). I ended up with 10,5 V + and 10,3 V -. At the outputs I have 37 mV offset. Not bad considering I did not pair a thing I think ?

I received new Jfets today and I will continue pairing to get the offset down.

Tea-Bag · 21st November 2009, 12:54 PM

Nay, I have working one, and about 45 other boards sitting in a box, and a set of LDR's that I really want to integrate here.
I am pretty sure my offset is about 1mv each side with a typical IDSS matched quad of Fets at 7.5ma.

jean-paul · 21st November 2009, 01:03 PM

The lower Jfets are supposed to have a higher Idss isn't it ? At least that is what I understood from various posts.

kannan_s · 21st November 2009, 01:12 PM

Quote:

Originally Posted by Phil Townsend

Mouser does not seem to have any 2SK170... at leastnot for 8 weeks!!!

Anybody out there have some Jfet's they wanna let go of???
Or a link will do just fine

Thanks

Spencer in this site can sell even matched sets - many have bought from him.
Also ebay has many hong kong sellers selling this FET.
You can try reading this thread for more such sources for this item
Kannan

billyk · 21st November 2009, 01:28 PM

I have some unmatched. PM me if you want them.

Tea-Bag · 21st November 2009, 01:43 PM

Jean-Paul, you may be right. This concept is fuzzy too me.
However my offset is much lower than yours, and can confirm it doesn't sound bad

I have bought 100pcs from Spencer, they work dandy.

21st November 2009, 05:35 AM	#481
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	Phil Spencer has gobs of them. They are real. He is in Hong Kong. I think its $37 for 100 which is a steal. Just search DIYaudio for 2sk170 and he will be in first ten hits in the marketplace. Uriah __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

21st November 2009, 12:34 PM	#483
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 11	Company Store and I beleive andrewT has some matched one's for sale. __________________ SemiSouth R085/R100A JFET available now DCB1/BiB #3 on order : SSHV2 Sign up Sheet/Payup Sheet Ends 2-26-2012 CLICK HERE

21st November 2009, 12:36 PM	#484
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 11	Can I get people who have not received their boards still to send me a private message? Trying to get a feel for where we are at. I expect they should all be there by the end of the month. Everyone in the states should have theirs (one exception). Thanks! __________________ SemiSouth R085/R100A JFET available now DCB1/BiB #3 on order : SSHV2 Sign up Sheet/Payup Sheet Ends 2-26-2012 CLICK HERE

21st November 2009, 12:54 PM	#486
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 11	Nay, I have working one, and about 45 other boards sitting in a box, and a set of LDR's that I really want to integrate here. I am pretty sure my offset is about 1mv each side with a typical IDSS matched quad of Fets at 7.5ma. __________________ SemiSouth R085/R100A JFET available now DCB1/BiB #3 on order : SSHV2 Sign up Sheet/Payup Sheet Ends 2-26-2012 CLICK HERE

21st November 2009, 01:03 PM	#487
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	The lower Jfets are supposed to have a higher Idss isn't it ? At least that is what I understood from various posts. __________________ It's only audio


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21st November 2009, 06:47 AM	#482
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hey, don't drain the pool if 100's aren't to be used. The guy sells matched pairs too. In Germany, easy for EU members http://www.hifituning24.de/0000009b2...b340c28bce.php

21st November 2009, 01:28 PM	#489
billyk diyAudio Member Join Date: Oct 2005 Location: North Central Mass, USA	I have some unmatched. PM me if you want them.

21st November 2009, 01:43 PM	#490
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 11	Jean-Paul, you may be right. This concept is fuzzy too me. However my offset is much lower than yours, and can confirm it doesn't sound bad I have bought 100pcs from Spencer, they work dandy. __________________ SemiSouth R085/R100A JFET available now DCB1/BiB #3 on order : SSHV2 Sign up Sheet/Payup Sheet Ends 2-26-2012 CLICK HERE

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