Re: Driving tri-state LED matrix
- From: Robert Adsett <sub2@xxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 30 May 2008 21:05:50 -0400
In article <b0519651-362b-48ae-ac6d-fa93f7a3b3b8@
59g2000hsb.googlegroups.com>, Tomás Ó hÉilidhe says...
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
At this point you can put on a shift register and actually use fewer
pins on the micro.
Robert
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