Re: [CGUYS] DC powered remote control switch buried in block of

2007-04-30 Thread Josh Byrd 

you should ask the guys over at makezine.com they are always hacking
stuff like this!

On 4/29/07, b_s-wilk [EMAIL PROTECTED] wrote:

I have two of those oversized calculators that I got on sale for $1
each. A few of those could work. You may find other parts inside that
can be useful on other projects. I have some left over solar panels from
AstroPower that are 6x6 and 8x8 that I use to recharge batteries for
outdoor lights, but I forgot about the tiny calc cells. Thanks for the
reminder.

Any idea how to wire an LED to the cell? Where to solder? Pix? Oh it's
so much fun to take things apart and rearrange them [when it works]!!

Dan, PLEASE tell us how you solve this.

Betty

 My questions would be:  How big physically would a solar cell be that
 was capable of providing power for LED's and where would one look for
 such and are they terribly expensive?

 Radio Shack.
  $5 Can produce 300ma @ 0.5 volts.
 $15 Can produce  50ma @ 6.0 volts.

 I have an old calculator that is powered by 5 cells in series. It cost
 about $5 and works in fairly dim light. Finding something like this might
 be cheaper than buying parts.





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Re: [CGUYS] DC powered remote control switch buried in block of

2007-04-29 Thread Tom Piwowar 
My first reaction was to use solar cells, but that could require wires. 
Can the solar cells be attached directly to the LEDs in ice, and still 
generate the tiny bit of power for the LED? It's worth trying. Won't it 
need resistors?

Not if the internal resistance of the battery is sufficient to limit the 
current. The resistor is only needed if you need to limit the current 
flow. 



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