Hi Guys,

what is the best and most low power way to seperate two 5 volt signals? I need to output either one or the other of them.

diodes and a resistor or a dedicated IC ? (NC7SZ38 )

i dont think I got resources for a VCC line for a IC so not sure what i can do...

would the quiescent draw from diodes and a resistor be much?

cheers

 

What do you mean, "seperate two 5 volt signals?"
What are you really trying to do?

 

An OR function gives an output high when either one or both of the inputs is high. Is that what you want?

If you want one or the other but not both, then you need the XOR (exclusive OR) function.

 

I want to drive mosfet which require 10v and that i hav to draw from microcontroller that has 5v output.. Pls help me

 

So i want 10v from 5v of microcontroller

 

I want to drive mosfet which require 10v and that i hav to draw from microcontroller that has 5v output.. Pls help me

Hijack, I suspect...

 

I want to drive mosfet which require 10v and that i hav to draw from microcontroller that has 5v output.. Pls help me

Rule #1 for a new member. Do not hijack a post. Please start a new one.

 

hijack, i suspect...

can u tell about this problem

 

Pls tell about the ics or device

 

How to create new post

 

ok,

i have a device A giving me 5 volts out and also device B giving me 5 volts out.

either of the 5 volts will do my load, but i need to seperate them.

i am not sure how to approach this without having to draw too much current.

 

eg

5V1 --------|
or ------------ > 5V out

5V2 ---------|

 

How to create new post

Near the top and the bottom of the page is a New Thread button.

 

eg

5V1 --------|
or ------------ > 5V out

5V2 ---------|

How much current does your load draw?

 

4/5 watts maximum give or take

 

1amp load current

 

Are you sure your sources can supply 1 Amp each? If so, you can use two 3A Schottky diodes. Look at 1N5820. They will each have about 300mV drop.
Connect the cathodes together, and to the load. Anodes connect to your sources.
If you need smaller devices, there are surface mount parts available.

 

i think thats too much current... i will check from some smts

 

i think thats too much current... i will check from some smts

What is too much current? The 3A rating of the diode means it can tolerate that current indefinitely. There are 1A units available, but it is not a good idea to run a component at the limit of it's specs. Also, lower current units will generally have a higher voltage drop.