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Old 26th May 2011, 11:25 AM   #1
evengravy is offline evengravy  Ireland
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Join Date: Sep 2008
Default Jfet Preamp Calculator


I've been reading a lot about Jfet's and biasing at ideal operating points. Although I am far from an expert I have created an Excel calculator that I thought might be helpfull to someone to aid in designing Jfet based preamps.

If anyone has suggestions for improvement feel free,


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Old 31st October 2011, 10:54 AM   #2
jerre85m is offline jerre85m
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Join Date: Oct 2011
thanks evengravy!
just what I was looking for
building the albert kreuzer
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Old 31st October 2011, 11:29 AM   #3
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
Looks really good.

Sheet 1 is Common Source.
Add a sheet for Source Follower (Common Drain)
Testing and measuring Vp & Idss could be on sheet 4 if you also have a Common Gate sheet.
Could you include cells showing the Formulae you have used?

For the Source Follower you could also add in the option to use the Dennis Feucht version with the extra resistors he adopts.
regards Andrew T.
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Old 31st October 2011, 11:37 AM   #4
Joachim Gerhard is offline Joachim Gerhard  Germany
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Thanks, that is useful.
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