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Help for the JFET preamplifier
Help for the JFET preamplifier
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Old 4th May 2008, 04:38 PM   #1
goodnight521 is offline goodnight521  Andorra
diyAudio Member
Join Date: Apr 2008
Default Help for the JFET preamplifier

I want to design a differential input JFET preamplifier whose input signal is 0.1Hz-20Hz and supply voltage is 5V.The gain needs to be more than 10(Vout/Vin).

I have made some pspice simulation with various JFET tubes in pspice library by building basic self bias voltage circuit.Basically the gain can achieve 10 at high frequency (>1KHz) but can't meet the requirment during the range from 0.1Hz to 20Hz.

So can someone recommend certain featured JFET or amplifier circuit?

Thanks a lot.
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Old 4th May 2008, 05:30 PM   #2
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
I wonder if FETs are too noisy at these very low frequencies?
regards Andrew T.
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