time delay off circuit

Hi guys, i need 12v circuit who will after connecting 12Vpower supply make a 2sec positive output and then off, untill reconnect power supply.

Please help,

Best regards from Croatia!

i forget output current max 3A.

Have you tried this circuit?

Delayed off means it turns on with power then after the timing cycle it turns off.

I think his input wire goes hot and remains hot for a while.  He needs only a 2 second pulse when his input wire goes positive.  From what I am seeing, your device will have output the entire time the input wire is positive, then the cap will keep it on additional time after 12 volts is removed from the input wire.

The following picture will do what you need it to do.  However it will take a 4700 microfarad capacitor to give you near or just above 2 seconds for your pulse.

Constant to Momentary Output ( link)

The capacitor allows the coil of the relay to be energized until the capacitor stores a charge, thus de-energizing the coil. The resistor bleeds off the charge of the capacitor when positive voltage is removed from the other side of the coil. You can increase the output time by simply changing the value of the capacitor. This one will give you about a 1/2 second output.

You are right.

He also wants no relay though.

How about this one?

http://www.sentex.net/~mec1995/gadgets/relays/relays.html