Date: Mon, 22 Dec 2008 15:38:19 -0800
To: puptcrit-AT-puptcrit.org
Subject: Re: [Puptcrit] LEDs


gosh . i tried dimming the eco friendly bulbs and she blew. right up!

so I am excitied about this thread, i would like to use less wattage bulbs,
maybe set up a still cyclist to power the whole lot of the show!

xo
randy
season's greetings.



On Mon, Dec 22, 2008 at 3:26 PM, Tim Lytle <tjlytle-AT-gmail.com> wrote:

> On Mon, Dec 22, 2008 at 5:44 PM, Hobey Ford <hobeyone-AT-gmail.com> wrote:
>
> > Can you dim LEDs?  I am messing with the toy theater and want to do
> > some cool lighting, any suggestions?  Like those new high intensity
> > LEDs.
>
>
> First, I'm assuming these are just regular LED's, not some kind of LED bulb
> (that replaces a normal light bulb), that would depend on the design of the
> bulb. You'll be able to get some dimming using a simple variable resistor
> in
> line with the LED (because you'll be limiting the current to the LED);
> however, LED dimming is generally done using PWM (pulse width modulation),
> which is essentially turns the LED on and off rapidly (but a constant
> timing) and varies the amount of time in a cycle that the LED is in the
> 'on'
> state. This would be somewhat analogous with the way a standard AC triac
> based dimmer works.
>
> Just did a quick google search:
> Dimming with resistors: http://www.mikesflightdeck.com/led_dimmer.htm
> Using PWM method:
> http://www.lunaraccents.com/technology-LED-truck-lights-dimming.html
>
> For PWM you can either use some standard simple electronics (timer ICs) or
> go the microcontroller route (something like the Arduino, BasicStamp, etc).
>
> Tim
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-- 
with love and affection
edith gloria hole
carnival sized cinnamon hearts puppet shows
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