What is the
missing component?
A Physics professor planned to illustrate a lecture with demonstrations of how
light can be intercepted by certain phosphors or various optoelectronic sensors
and transformed into entirely new light. He wanted an ultra-simple demonstration
of how an LED would glow when biased by a forward current provided by a suitable
sensor. He rummaged through his optoelectronic drawer and found two silicon solar
cells, several cadmium sulfide photo resistors, a couple of AlGaAs red LEDs, some
silicon phototransistors and half a dozen silicon photodiodes. In his parts cabinet
he found some transistors, miniature chokes and assorted resistors and capacitors.
How did he combine the smallest number of components to do what the phosphor
card did? Go to www.Jameco.com/search8 to see if you are correct.
The puzzle was created by Forrest M. Mims III
Sign up for our e-newsletter
and get a bonus puzzle.
www.Jameco.com/enews
1-800-831-4242 | www.Jameco.com
4
December 2010
