ProtoDAC TDA1387 X8 project

[hifinet]

I came across this in my files for changing the Ali cascode JFET buffer to a Pass B1R2. Of course, it is no longer a cascode buffer. What attracted me to this circuit is that John Curl said in a diyA post that you can't improve on the cascode JFET topology in that circuit. How well it has been implemented in this board remains to be seen.

"Changing eBay JFET Cascode Buffer to Pass B1R2 buffer:
you can leave C1 and C3 in , toss C2 out
leave out R1, R2 , R7,R8
leave out Q4 and Q1 , put shorts through C-E holes
and that's it - B1 V2
depending of your JFets Idss , you can put shorts instead of R3 and R5 , or decrease them to 10R ...... or put 20R trimpot between sources , with wiper to out , if you need to trim output offset
I bought some j113/j176 to test my boards before I use my dodofets on them."