On Wed, 30 Oct 2002, Sikorsky wrote:
> ----- Original Message -----
> From: "Paul Schreiber" <synth1@...>
>
>
> > There is a chip (been around 20 years) called a UN2003 that is made for
> this. Cheap, too!
>
> you mean ULN2003 - six buffers in a 16 pin dil..?
Seven darlington buffers in a dil16. I've used thousands of these as
common-cathode LED display selectors. For the segment side, I use either
a UDN2981 (eight current-sourcing drivers in a dil18) plus an rdip, or for
BCD I use the CA3161, a legacy part with constant-current outputs which
has the fun feature of being able to display the numerals 0~9, a negative
sign, a blank, and the letters 'H','E','L','P'.
Crow
/∗∗/