All Questions
2
questions
1
vote
1
answer
184
views
Led must be mounted SINK or SOURCE so as not to interfere with communications? [closed]
I used 3.3v microcontroller. I want to add TX LED and RX LED communication on RS232, RS485,
TTL/CMOS.
My question:
Led communication must be mounted as SINKING or SOURCING on I/O microcontroller ...
21
votes
6
answers
13k
views
current sourcing, current sinking
I'm a student studying electronics and I'm having trouble understanding the concept behind current sourcing and current sinking. We've covered it in a lab using a 7404 and an LED and all that. Just ...