Search found 2 matches

by kromar
03 May 2017, 01:15
Forum: Hobby Circuits and Small Projects
Topic: IO Expander PCF8574 alternavitve/solution?
Replies: 4
Views: 12706

Re: IO Expander PCF8574 alternavitve/solution?

Thanks for the answer, my relays have that option but since I have Lee's that should indicate the power state its no just on the relay side. As for the transistors, i dont really understand why i should have used a pnp, can you give a short explanation? I did breadboard it but without the IC, i will...
by kromar
29 Apr 2017, 05:47
Forum: Hobby Circuits and Small Projects
Topic: IO Expander PCF8574 alternavitve/solution?
Replies: 4
Views: 12706

IO Expander PCF8574 alternavitve/solution?

i have been working on a pcb to controll a couple of relays and have the functionality to override with a power switch and a push button for manual triggering and also some led's that indicate the power states. so i got my 2nd pcb after a total failure of the first one (im new to electronics) which ...