Delayed start

Thread Starter

TheDag

Joined Jan 1, 2010
94
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...
 

Thread Starter

TheDag

Joined Jan 1, 2010
94
Thanks,
There is an easier way? Maybe with capacitor or something?

BTW, crutschow, Do you have schematic for that?

Thanks.
 

KMoffett

Joined Dec 19, 2007
2,918
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
 

Shagas

Joined May 13, 2013
804
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
 

crutschow

Joined Mar 14, 2008
34,027
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.

Power On Delay.gif
 
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