Delay Circuit

I have been trying to make a delay circuit without a 555 timer....
I am using a resistor, capacitor and transistor, but i have not been able to still achieve my goal.. I want a 3 seconds delay before the LED comes on......
Please I need assistance, any help would be appreciated

Sadly not going to work, even if you can find the components, a 2.2mF Capacitor is quite large.

Transistor switch maybe?

yeah i did not actually work, but i cant put an explanation to that.. even when I used higher voltages and change transistor value

I hope this is not overly technical but we do understand these things extremely well having spent years in it commercially, even teaching the subject, so here goes...

You need to check the voltage on the base.

Bi polar transistors are current driven devices the base needs to be approx 0.6 v above the emitter, you have a switch arrangement and needs to saturate the transistor such that the Vce is at Vce sat. The current going into the base will limit the collector current which will flow (Ic = ib * hfe) the diode will be pretty current hungry so the high value resistors you have will limit the base current and hence the IC current.

@brown: I got that pretty well... Thanks..... I will be on our neck more for knowledge... THANKS

OK, good, pleased we made a contribution, sadly we do not have an emormous amount of time to commit to these Forums, hope you fathom a solution soon.

You need a current limit resistor in series with the LED (unless you're relying on the transistor beta (not wise).

And speaking of beta, to keep the capacitor value down, use a high a beta transistor as possible. A darlington might be a good choice, but at 5 volts there isn't a lot of "head room".