Need help on a simple (so i thought) circuit

[rs20]

Sooo.. Like this?

Yep, that should work nicely. (BTW, you've basically just made a NOT gate there, you could also use a CMOS NOT gate with a single pullup at the input. But who has those lying around?)

[IanB]

Sooo.. Like this?

That should do it.

[nightfox7]

Awesome, thanks guys.

Now, would this be the same thing with a npn?

[IanB]

Now, would this be the same thing with a npn?

No, but you could try something like this:

[nightfox7]

Now, would this be the same thing with a npn?

No, but you could try something like this:

THIS WORKS. 

thanks so much, i'll post back here when i get the final thing all soldered up, so y'all can at least see what you were helping me with

[rs20]

As mentioned earlier, the NPN version of this circuit consumes about 1mA all the time, while the input is floating. The PNP version consumes virtually nothing when the input is floating. Just something to keep in mind if there are batteries involved?

[nightfox7]

As mentioned earlier, the NPN version of this circuit consumes about 1mA all the time, while the input is floating. The PNP version consumes virtually nothing when the input is floating. Just something to keep in mind if there are batteries involved?

I plan on building the PNP version as there are fewer components (smaller board, less weight), and because of the power consumption issue. I am just super happy to see it doing what I want, and I've learned a lot..

[sv2hqx]

I think you should put a 5 volt relay with low current or an 7805
You find them both on old routers
73

Sent from my Optimus 4X HD using Tapatalk

[nightfox7]

I think you should put a 5 volt relay with low current or an 7805
You find them both on old routers
73

Sent from my Optimus 4X HD using Tapatalk

I didnt know if there would be any weird kickback with a relay..
I am using a 7805 to regulate voltage.

73s
-Seth

[rs20]

I think you should put a 5 volt relay with low current or an 7805
You find them both on old routers
73

What on earth? In what world are a 5 volt relay and a 7805 voltage regulator interchangeable alternatives?