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27th May 2009, 05:26 AM
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#1 |
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diyAudio Member
Join Date: May 2003
Location: San Diego, USA
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What are "J505" semiconductors?
I am buying parts for an amp and the semis are specified in a manner which I cannot comprehend-
U1/U3/U4/U6 (4) = J505 (1mA CRD) U2/U5 (2) = J511/J510 (4.7/3.6mA CRD) What is this? What are the Mouser part numbers? thanks!
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Retired from DIY (2010) but still lurking now and again. My DIY audio projects- PartTimeProjects.com. |
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27th May 2009, 05:33 AM
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#2 |
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diyAudio Member
Join Date: Nov 2008
Location: Australia
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They are FET type constant current devices, currently made by Siliconix, quite expensive in Australia I am not sure over there, try Googling and you should end up with a Data sheet, from that may be reference to an application note, and then there is Wikipaedia
Some information on the Erno Borbly site Alfred |
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27th May 2009, 05:55 AM
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#3 |
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diyAudio Member
Join Date: Feb 2004
Location: Anonymityville
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This is a search for "current regulator diode" at Mouser......
http://mouser.com/Search/Refine.aspx...+diode&FS=True
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"If you don't like funerals don't kick sand in Ninja's face." - Ninja |
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27th May 2009, 07:14 AM
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#4 |
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diyAudio Member
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
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Mr Green,
there's an additional J511 CRD (U1) between the two green led pairs in the amplifier schematic. A bunch of equivalent CRD numbers can replace the J500 Siliconix series, CRDs have become pretty obsolete, sources have raised the price levels accordingly. Other cheaper option is replacing the current regulator diodes by a simple CCS, a JFET costs a few dimes, not as pretty on the boards as a tiny CRD though.
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Not so much,.......if it says "ZM" in the corner. |
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27th May 2009, 02:18 PM
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#5 | |
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diyAudio Member
Join Date: May 2003
Location: San Diego, USA
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Quote:
I am just the robot who inserts parts
__________________
Retired from DIY (2010) but still lurking now and again. My DIY audio projects- PartTimeProjects.com. |
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27th May 2009, 09:45 PM
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#6 |
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diyAudio Member
Join Date: Jul 2007
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There's a pretty good article on CRD's, and how to make your own here:
Tangentsoft - Audiologica - biasing opamps into class A. Its a good read. |
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