Timed LED Light Circuit

[AtomSoft]

Mike that is much simpler heh... I still like the PIC idea since you can have it flash the leds or add effects if you want...

 

[roadrunnerjohn]

how much space do you have for batteries and such?

I'm hoping I can fit it all under the bonnet in a space of 80mm (L) x80mm (W) x 50mm (H).

 

[zipdogso]

I like Mikes idea.....I think the OP is strugggling with basic electronics... to bring in programming a PIC is going too far....maybe not for you Atomsoft BUT your not the OP.

 

[AtomSoft]

heh i know but a suggestion is what he asked for so heh i gave some

I like Mikes idea also !

 

[ronv]

I think Mikes circuit will work for you and you can get the parts at Radio Shack. I think the only FET they have is theIRF510 so you might want to move the top of the switch to the top (+) of the battery.

 

[crutschow]

I think Mikes circuit will work for you and you can get the parts at Radio Shack. I think the only FET they have is theIRF510 so you might want to move the top of the switch to the top (+) of the battery.

If you move the switch there, then the LEDs will go out as soon as the switch is released.

 

[MikeMl]

If the feed for the switch bypasses the 100 Ohm resistor, then put another small resistor 10 to 100 Ohms in series with the switch. This is to limit the initial charging current for the capacitor to protect the switch's contacts. Could be that the battery's internal impedance is sufficient.

 

[Ubergeek63]

still simpler to use a single schmidt trigger for the timing element. a 3AA holder will fit easily and you could probably get a 3C holder in there! with Cs you could drive 4 whites at 20mA each for 100Hrs

 

[ronv]

Lights

OK. I think this addresses the concerns and uses RS parts.

 

[Ubergeek63]

OK. I think this addresses the concerns and uses RS parts.

yes and no... move the resistor to the top side of the circuit. where it is it robs the FET of gate voltage reducing the voltage available to the LEDs by a bit more than the gate cut off voltage.

and add a zener to protect the gate from static if it does not already have one built in.

 

[ronv]

Rev 1.1.1.1.1.1

Sorry John,
Don't know where my head was when I posted that. Try this. Hope your son hasn't outgrown the idea by now.

 

[roadrunnerjohn]

No, he difinitely hasn't out grown it yet. I am just so thankful for everyones input and effort. You guys have spent a lot of your time to help me and have such giving hearts. May God bless you all.

 

[ronv]

We get our fun doing it. If you have trouble finding which pin goes where come back for help.
Good luck!