View Single Post
Old 26th Apr 2018, 7:22 pm   #32
Slothie
Octode
 
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 1,287
Default Re: MK14 schematic revisions

I've been looking at data sheets and the 74LS08 can only drive 0.4 mA compared to the 7408's .8mA, so you are right the LS part probably would die or make the display dim. If I get stuck then a 74HC08 could be used as the outputs clamp at 20mA.. although I might need to put in some current limiting resistors for the display as SOC clearly relied on the current limiting of the 7408 and I dont want to destroy my rare 7seg displays! So I really need to find some real 7408's.
Slothie is offline