Need help for JFET amplifier

goodnight521 · 6th May 2008, 07:38 AM

Can anybody recommend a discrete JFET preamplifer whose voltage gain is over 10 with supply voltage is 5V.The frequency of input signal is from 0.1Hz to 20Hz.

I have tried numerous JFET tubes to build up circuit working at Q point but can't get enough gain at low frequency.Attachment is schematic with pspice.

Thanks!

Mooly · 6th May 2008, 12:07 PM

0.1 Hz to 20Hz, Why not use a FET OpAmp designed for low voltage single rail use. Much easier, much better performance.
What are you trying to do ?
Or a bipolar OpAmp with discrete FET front end.

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6th May 2008, 12:07 PM	#2
Mooly diyAudio Member Join Date: Sep 2007	0.1 Hz to 20Hz, Why not use a FET OpAmp designed for low voltage single rail use. Much easier, much better performance. What are you trying to do ? Or a bipolar OpAmp with discrete FET front end.

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