Led controller

untitled.JPG (3722Bytes)

Hi this is an led controller there can only be one led on at a time it was on crocodileclips i don't know what its called but if anyone does that would be helpful. when A is high 0 is on if B is high 1 is on if A and B are high 2 is on and when A and C are high 3 is on or somthing like that.

Thanks,

A 74138 is a 3:8 line**
A 74138 is a 3:8 line decoder and a 74154 is a 4:16 line decoder. They take binary data and decode it to any of the outputs. Where ** is is the family of chips, most common today are HC so 74HC138 or 74HC154. Different families have different requirements for current and voltage. The HC family is the most versitile.

Link to 74ls138 datasheet
Link to 74ls138 datasheet

**Thanks **
Thanks for the info