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Old 12-05-2008, 01:15 PM   #11
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Here is the final schematic for your viewing pleasure

Assuming a 30ma rating for the LEDs and a required voltage drop of .7v you can calculate the resistor values of R2 with this formula:

(Supply Voltage - .7)/0.03 = value of resistor in ohms.


(supply voltage - voltage drop of LED)/(required current value for LED) = resistor value

this will allow you to use which ever LEDs you wish and still not burn em out.

I would round up to the neares common value you can find.

R3 can be adjusted too far and cause a null 0v no light you can also use a 10k trimpot to make it smaller and fit better on a PCB.

Q1 can be replaced with any simalar small signal NPN transistor.

once i solder all the components to the PCB I epoxied the whole thing except the two variable resistors nice and water tight. Same thing at the connections for the LEDS.

I mounted the LEDS to a thin strip of PVC drilled holes to fit just the LEDs and then mounted that to the underside of my light. HTH
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Old 12-06-2008, 07:33 PM   #12
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Thank you!

"2- before attempting to plant, have a beer or a Bourbon. That will help to steady your hands…" -- elwaine

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diy, light, moonlight, solar power

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