Timeline for Build an 8-digit display using Seven-segment Display and 74HC138
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 25, 2017 at 8:18 | vote | accept | andreas.vitikan | ||
| Dec 21, 2015 at 18:46 | comment | added | crasic | @andreas.vitikan all electronic components have a datasheet associated with it that describes thevpart and cover the specification of the part. More often than not will include application information and reference schematics. ULN2003 datasheet | |
| Dec 19, 2015 at 6:31 | comment | added | andreas.vitikan | Apparently they have ULN2003/4's in stock :) Exactly what are they and how could I use them to replace the two transistors in the above schematic? | |
| Dec 18, 2015 at 22:11 | comment | added | pipe | There's also the venerable ULN2002/3/4 containing 7 driver transistors in a single DIP. That could be interesting if you want to breadboard this and don't want to connect everything. | |
| Dec 18, 2015 at 21:56 | comment | added | WhatRoughBeast | Try digikey.com. And PNPs are just like NPNs, except that you tie the emitter high, and pull base current rather than sourcing it, and the collector sources current instead of sinking it. | |
| Dec 18, 2015 at 21:26 | comment | added | andreas.vitikan | The 2N3906 is a PNP transistor, right? I'm not entirely familiar with how PNP transistors work, I am much more used to NPN's... As for the 138, that is what my local electronics store provides, it took half an hour of googling to find an IC that is both a demux and in stock at the local store :D Unfortunately, they do not seem to stock the 238. Any suggestions? | |
| Dec 18, 2015 at 21:21 | history | answered | WhatRoughBeast | CC BY-SA 3.0 |