Hi,
I Have a device that turn ON right after connecting to 5v.
I Want to delay the "turning on" of the device for 3 seconds...
I Mean, When plug into 5v, its wait 3 seconds, and then its power on the device....

Thanks in advance...

 

More info on the "device" would be helpful.

 

Its shouldn't matter..., I Just have to delay the 5v input for 3 seconds...

 

Its shouldn't matter..., I Just have to delay the 5v input for 3 seconds...

You could use a 555 one-shot controlling a P-MOSFET in series with the load.

 

http://www.talkingelectronics.com/projects/200TrCcts/101-200TrCcts.html

Scroll down to 'Time delay circuits'

It's basically a circuit that activates a relay a set amount of time after you power the circuit, but you can use it for anything .
The trick is that the micro has to charge up to about 1,2 volts before the circuits starts

 

Thanks,
There is an easier way? Maybe with capacitor or something?

BTW, crutschow, Do you have schematic for that?

Thanks.

 

Thanks,
There is an easier way? Maybe with capacitor or something?

BTW, crutschow, Do you have schematic for that?

Thanks.

This is where you need to add more info about the "device". Like current draw? Will a slow ramp of the supply voltage be a problem? ....?

Ken

 

Thanks,
There is an easier way? Maybe with capacitor or something?

BTW, crutschow, Do you have schematic for that?

Thanks.

Well the easiest way that I know is by using a capacitor and a transistor
as in the circuit that I linked

 

its charger, 5v output charger.

 

Here's a circuit that is somewhat simpler than the 555 circuit I suggested.

The P-MOSFET can be any "logic level" type rated for at least three times the current your charger draws.

R_Ld is just to simulate your charger. It's not part of the circuit you build.