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Need help for JFET amplifier
Need help for JFET amplifier
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Old 6th May 2008, 08:38 AM   #1
goodnight521 is offline goodnight521  Andorra
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Join Date: Apr 2008
Default Need help for JFET amplifier

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.

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File Type: jpg schematic.jpg (34.7 KB, 146 views)
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Old 6th May 2008, 01:07 PM   #2
Mooly is offline Mooly  United Kingdom
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Need help for JFET amplifier
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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