This method is something that I actually just thought off after I fired off my
last email!!! Since my 7-seg's are common cathod, I would need some sort of
transistor between the common-cathod pin and ground, correct? What came to mind
was a n-channel MOSFET (low side switch). This seem like a reasonable approach?
BJT's might be more attractive since they are in smaller in through-hole form,
but are there any big differences in what I use??

Thanks,

Jai

Quoting Ishaan Dalal <izx@XIZX.NET>:

> Something that has worked for me in the past is to use one driver (74LS47/48
> or 4511/4513/4543) and connect its outputs (A...G) to all 4 segments in
> common. That takes up 4 pins of your port. Then you use the other 4 pins to
> drive transistors that source OR sink power from each of the 4 7-segs.
> That's another 4 pins. One port does it!
>


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