Tristated output to two common Base transistor issue

[RussMartin]

Bravo, Alain!

If you haven't seen it, here is Alain's tested circuit:

<IMG SRC="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2007&stc=1&d=118952080 6">

(His PDF file is easier to read.)

The input is at 2.75 VDC, eliminating the worry about a floating input pin when the input is set to high-Z.

I think I mentioned the possibility of using MOSFETs several posts back. I was going to try it with Luciano's original circuit, something like this:

<IMG SRC="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2008&stc=1&d=118952090 8">

Exchanging the positions of R6 with D1 and R5 with D2 in Alain's version will accomplish the same result, but without the voltage divider.