What is the
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?
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