4-digit seven segment display - Electronic Circuits Projects Diagrams Free

s2301931 · 19th April 2006, 08:03 PM

how can i use a 4-digit seven segment display for displaying some data using a 2-to-4 decoder instead of transistors for the multiplexed display.

Papabravo · 19th April 2006, 11:39 PM

What do you have against the poor transistors. What did they ever do to you?

ljcox · 20th April 2006, 07:57 AM

Quote:

Originally Posted by s2301931

how can i use a 4-digit seven segment display for displaying some data using a 2-to-4 decoder instead of transistors for the multiplexed display.

Assuming you have common cathode displays, you could use a 74HC139.

Design for a LED current of 6 mA and parallel the inputs and outputs since the max output current is 25 mA and you need 6 * 4 = 24 mA which is close to the 25 mA limit. So you can guard against this by paralleling the 2 sections.

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19th April 2006, 08:03 PM	#1
s2301931	4-digit seven segment display how can i use a 4-digit seven segment display for displaying some data using a 2-to-4 decoder instead of transistors for the multiplexed display.

19th April 2006, 11:39 PM	#2
Papabravo	What do you have against the poor transistors. What did they ever do to you?