M_Dennis

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3Instructables3,429Views2CommentsJoined June 8th, 2017

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• M_Dennis's instructable Mini Acrylic Edge Light's weekly stats: 1 year ago
• 298 views
8 favorites
• M_Dennis entered Mini Acrylic Edge Light in the Makerspace Contest 2017 contest 1 year ago
• M_Dennis commented on M_Dennis's instructable 9V LED Flashlight1 year ago

I always welcome comments from people who write their own Instructables. I invite you to write one appropriate for ages12-18 on how to calculate the values for this circuit using three random LEDS.(Don't take this the wrong way, but you need to pay attention to educational theory !-)We use a resistor to teach what a resistor is for. Using more diodes might be an efficient circuit (though I question its resiliency in a power fluctuation) but when teaching, separating functions makes the game a little easier for teacher and student. The math is more important than the light output. (Don't take this the wrong way, but you need to pay attention to Design for Manufacturing !-)We make design choices with purpose: our budget was a strict \$1.00/unit, and we've eased that only because batteries ...

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I always welcome comments from people who write their own Instructables. I invite you to write one appropriate for ages12-18 on how to calculate the values for this circuit using three random LEDS.(Don't take this the wrong way, but you need to pay attention to educational theory !-)We use a resistor to teach what a resistor is for. Using more diodes might be an efficient circuit (though I question its resiliency in a power fluctuation) but when teaching, separating functions makes the game a little easier for teacher and student. The math is more important than the light output. (Don't take this the wrong way, but you need to pay attention to Design for Manufacturing !-)We make design choices with purpose: our budget was a strict \$1.00/unit, and we've eased that only because batteries that met the budget had an unacceptable failure rate. Resistors are still cheaper than LEDs. More LEDs would require more plastic for mounting - more time on the printer, which costs money, too. And since there is money in the soldering jigs, you can't alter them without justifying that cost.The polarity of one diode is a manageable issue when building kits with 200 impatient kids, most of whom have never held a soldering iron. Also, make your circuit work with my construction jigs, so kids don't burn themselves trying to assemble the LEDS. There is enough variation in handmade circuits to make fitting the plastic over one LED a challenge; threading three LEDS would certainly be interesting. Show me how you would do it.

• M_Dennis's instructable 9V LED Flashlight's weekly stats: 1 year ago
• 685 views
24 favorites