[Robotgroup] Do you have a 15V and 500mA power supplier?

[Paul Atkinson]

Hi PY,

Ok, I brought one to Vern, 12V @ 700ma on Friday evening. If you already have one, I'll put mine back on the shelf for the next project.

Paul

Pui Yee Hung <puiyeehung at gmail.com> wrote: Hi Paul,
Don;t need to look around for the Wall wart. I get  one with 12V  and
200mA.  So I am set!  Thanks!!!

Py


On 9/28/06, Paul Atkinson 
 wrote:
>
> PY,
>
> If the LEDs of a petal are in series, then the current is still only 20ma
> for the petal, so you might only need 100ma total for all 5 petals.
>
> If you can arrange it so that you can use 12V, then I may have a PC power
> supply you could use, or perhaps even a wall wart that can do 12VDC at 1 or
> 2 amps.
>
> This link has an LED wizard/calculator that can help you with the
> connections:
> http://led.linear1.org/led.wiz
>
> Paul
>
> Pui Yee Hung 
 wrote:  Hi all,
>
>
> Wondering whether you have a 15V and 500mA  power supplier to spare? (
> higher voltage and more current will be even better)The power supplier is
> for  a dorkbot project.  Below will describe the idea, your suggestion or
> comment is welcome!
>
> This project  has a mechanical flower which is lighted by Leds.  The Leds
> are mounted on plexi-glass strips which look like petals. The flower will
> have a minimum of 5 petals ( if possible 8 petals). Each petals has 5 leds
> (
> in parallel).  The petals are control by basic stamp II, and connect to
> ULN
> 2803 ( High current Darlington).  Each petal is connect to the power
> supplier.  The plan is to program the Basic stamp so that each petal can
> be
> lighted up or dim down at different sequence.
>
> In calculating my power supply requirement, I use the following assumption
> :
> Each petal is link in series and power by the power supplier. Each LED has
> a
> voltage drop of 2 V to 3 V( bright white LED).  So for 5 petal, I need 10
> to
> 15 V.The current draw per LED is ~ 20MA.  For 5 petal , 25 LEDs, I need
> 500mA.
>
> Is this assumption realistic?
>
> IDenise has a design of the petal.I am not attending the meeting today
> because of sickness.
>
> Thanks in advance for your help!!!
>
> Py
>
>
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