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Old 19th July 2011, 11:11 PM   #11
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Join Date: Mar 2001
You can transformer couple the input so as to use a split supply with DC
coupled output - this way you can reject the supply rail noise, something
you don't have to do when ground is the lower rail.

Alternatively you would put one or two front end transistors to level-shift
the input down to the Gate of the driver transistor - but then you have the
original JLH circuit with three stages instead of two.

If you had a very very quiet negative rail, you could make it work as is.

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Old 28th July 2011, 01:37 PM   #12
FYC is offline FYC  Hong Kong
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Location: Hong Kong
Originally Posted by tmblack View Post
How would the circuit change if any with the input J-FET ?
Here is the circuit attached.
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File Type: jpg J_PLH.jpg (131.9 KB, 230 views)
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