Hi I am looking for some help with a Dimming circuit for a LED board I make for a Video Lamp Here's is the info on the LED used
Super White LED Specifications:
Size (mm) : 5mm
Lens Color : Water Clear
Reverse Current (uA) : <=30
Life Rating : 100,000 Hours
Viewing Angle : 180 Degrees
Absolute Maximum Ratings (Ta=25°C)
Max Power Dissipation : 80mw
Max Continuous Forward Current : 24mA
Max Peak Forward Current : 75mA
Reverse Voltage : 5~6V
Forward Voltage : 3.0-3.2V

I used 96 LED's 4 LED in series will have a 120ohm resistor Each row so 24 rows 24ma per Row
I am using 15V 2 Amp Power supply
Can anyone help with a Dimming circuit for this unit thanks much for any help Charlie

 

You just need a variable 1A power supply that is adjustable from ~12V to ~16V. Almost any DC regulated power supply, linear or switcher, would work.

 

you would be better of using a 555 timer circuit to PWM your LED's through a Mosfet, then you can vary the 555's output to dim/brighten your LED's..... this will also lengthen the "life" of your LED's, instead of keeping them constantly "on"....

My .02

 

I'm with BMorse.
PWN is also popular with motor controlling.

Here's an example of how to configure the LM555:
http://www.ledmakers.net/show/?id=152
Pretty much self-explanatory form here, just add the MOSFET part.

 

I've used the following circuit a couple of times with success.

http://www3.telus.net/chemelec/Projects/PWM/PWM.htm

 

thanks all

does the 555 PWN works with a 15V PS??? or she I use a resistor to lower the voltage to the PWN

 

Absolute maximum Vcc is 18v.
Most datasheets for 555 timers give specifications at 5v, 10v, and 15v.

 

you would be better of using a 555 timer circuit to PWM your LED's through a Mosfet, then you can vary the 555's output to dim/brighten your LED's..... this will also lengthen the "life" of your LED's, instead of keeping them constantly "on"....

My .02

Any I dead which Mosfet would be best needs output 2.2amps 96LED at 3v 24ms

 

Any standard N-channel power MOSFET rated for Vdss=30v or more, and at least 5A Id (drain current).

 

Thanks all for the info one more thing if I want to your Battery,Cads to drive this circuit 12vdc 2.2amps any Ideals on circuit and battery?
Thanks