Dwayne Reid wrote:
> One suggestion should you ever have to revisit that circuit again:
> add a series base resistor to Q9.  That will keep your PIC 5V supply
> current low whenever the high voltage input is low enough that Q9
> saturates.

Even if the collector of Q9 is disconnected, the current draw from the PIC
pin would be only about 6m, which is well within what the PIC can do.  The
input voltage would also have to be below spec such that little current is
coming thru R7.  Adding a resistor in series with the base of Q9 won't help
in-spec case, but will soften the edges reducing efficiency.


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