Need more help with LEDs

[ANTlabs]

I need a circuit that makes 15 green LEDs fade slowly in and out every 30 seconds. I also need to know what batery this will need for it to run for 2 hours.

Thanks

 

[birdman0_o]

As I said in your previous post 15 Leds at 20mA will be :
Iav = 50% *20mA * 15 = 150mA, using three AA batteries this circuit can last above and beyond 2 hours. 150mA * 2 hours = 300mA hours.
P = IV
Pav = 50%IV *15 Leds
Pav = 0.5 * 20mA * 3V * 15V
Pav = 0.45W
Now you need to account for the power dissipated in the resistors etc.

This is just to get the idea accross...

 

[dawhale]

Thanks for this info. Good post!

DD

 

[ke5frf]

I just took a look at your homepage ANTLabs, and noticed you have your normally open and normally closed switches backwards.

**broken link removed**

At least they appear that way if you have them labeled underneath.

Remember, switches and relays are always labeled in their resting or deenergized state in schematics unless otherwise noted.

 

[microtexan]

Man, your web site really needs some work. Many mistakes and concepts.

 

[ANTlabs]

Thank you two for the reviews, I have not been able to change any errors, though, It wontlet me on the sie! But please stick to he circuit. I only have 3 days left to gt it! can someone please post a schematic!!! It just needs to make the LEDs fade in and out.