Re: Driving tri-state LED matrix

On May 30, 3:06 pm, Andrew Smallshaw <andr...@xxxxxxxxxxxxxxxx> wrote:

Try redrawing this in a conventional manner, with Vcc at the top.
I started looking at this diagram but I lost interest the minute
I saw that I was going to have to unravel the circuit before
considering it.  There's only so much time people are willing to
invest in considering a news post.


Are you talking about the way the emitter on the PNP is the bottom pin
rather than the top pin? If so:

http://users.imagine.ie/toe/disp2.jpg
.