- #1
Niles
- 1,866
- 0
Hi
I am trying to design something similar to a NOT-gate (very simple), and I have been following this figure: http://en.wikibooks.org/wiki/File:Electronics_TTLNOT.PNG. My question is the following: Say that I instead of grounding the lower branch want to send a current through it to e.g. a LED. Is it necessary for me to place a resistor before the LED?
I am trying to design something similar to a NOT-gate (very simple), and I have been following this figure: http://en.wikibooks.org/wiki/File:Electronics_TTLNOT.PNG. My question is the following: Say that I instead of grounding the lower branch want to send a current through it to e.g. a LED. Is it necessary for me to place a resistor before the LED?