A light emitting diode from a power transistor. This unusual effect shows how a current between base and emitter makes a semiconductor junction emit light.
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To show this one needs to expose the silicon chip in a NPN power transistor such as a 2N3055. With the 2N3055 base negative and emitter positive 11.4 V current 400 mA is drawn and the junction lights up. The chip is 2 mm wide.
Camera has 2 sec exposure in darkened room with a plastic magnifying lens.
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Photo Date: Feb 10, 2006