Jfet Preamp Calculator

evengravy · 26th May 2011, 11:25 AM

Hi,

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,

Cheers,

even

jerre85m · 31st October 2011, 10:54 AM

thanks evengravy!
just what I was looking for

building the albert kreuzer

AndrewT · 31st October 2011, 11:29 AM

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.

Joachim Gerhard · 31st October 2011, 11:37 AM

Thanks, that is useful.

31st October 2011, 11:29 AM	#3
AndrewT diyAudio Member 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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31st October 2011, 10:54 AM	#2
jerre85m diyAudio Member Join Date: Oct 2011	thanks evengravy! just what I was looking for building the albert kreuzer

31st October 2011, 11:37 AM	#4
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Thanks, that is useful.

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