Gary Pimm's self biasing CCS - parts

jkeny · 16th May 2008, 11:05 PM

Can the IRF1820 Mosfets be replaced in this circuit as I can't find them or datasheet.

What part would be most suitable & what component value changes would be needed?

nerdorama · 16th May 2008, 11:28 PM

It's IRF820 (rather than IRF1820) and they are in stock at both of these distributors. I've built some of Gary's CCS's and they work great.

Good luck,
John

jkeny · 17th May 2008, 12:54 AM

Thanks John,
I was actually using another schematic that read IRF1820 - doh!

AndrewT · 17th May 2008, 10:13 AM

Could you explain the difference in operation for the pentode vs the mosFET connection options?

jkeny · 17th May 2008, 11:04 AM

Sorry, Andrew,
I'm just a worker bee - I don't know the how's of it!

bobgroger · 18th May 2008, 05:01 AM

Quote:

Originally posted by AndrewT
Could you explain the difference in operation for the pentode vs the mosFET connection options?

Andrew, scroll down on this page....
http://www.pacifier.com/~gpimm/self_bias.htm

Bob G.

16th May 2008, 11:28 PM	#2
nerdorama diyAudio Member Join Date: Aug 2005	Mouser & Digikey It's IRF820 (rather than IRF1820) and they are in stock at both of these distributors. I've built some of Gary's CCS's and they work great. Good luck, John

17th May 2008, 10:13 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Could you explain the difference in operation for the pentode vs the mosFET connection options? __________________ regards Andrew T.

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17th May 2008, 12:54 AM	#3
jkeny Banned Join Date: Feb 2007 Location: Dublin	Thanks John, I was actually using another schematic that read IRF1820 - doh!

17th May 2008, 11:04 AM	#5
jkeny Banned Join Date: Feb 2007 Location: Dublin	Sorry, Andrew, I'm just a worker bee - I don't know the how's of it!

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