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Old 27th May 2009, 05:26 AM   #1
lgreen is offline lgreen  United States
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Default 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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Old 27th May 2009, 05:33 AM   #2
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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

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Old 27th May 2009, 05:55 AM   #3
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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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Old 27th May 2009, 07:14 AM   #4
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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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Old 27th May 2009, 02:18 PM   #5
lgreen is offline lgreen  United States
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Quote:
Originally posted by jacco vermeulen
Mr Green,

***

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.

I am just the robot who inserts parts
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Old 27th May 2009, 09:45 PM   #6
Artie is offline Artie  United States
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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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