J-JLH or PLH-J ? - Page 2

Nelson Pass · 19th July 2011, 11:11 PM

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.

FYC · 28th July 2011, 01:37 PM

Quote:

Originally Posted by tmblack

How would the circuit change if any with the input J-FET ?

Here is the circuit attached.

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19th July 2011, 11:11 PM	#11
Nelson Pass The one and only 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.