GoKawiilFET Transistor Homemade From Cadmium Sulfide Photocell.
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FET Transistor Homemade From Cadmium Sulfide Photocell.
By Nyle Steiner K7NS May 7 2009.
Updated May 10 2009
CDS Photocell Made Into A FET Transistor
The picture above shows how transistor action was observed by improvising an insulated gate to a cadmium sulfide photo resistor. The picture was taken in normal light but the experiment had to be performed in the dark.
The photocell used is pictured above. It is a very common type which I purchased from Radio Shack many years ago.
Photo Resistor Converted Into A Field Effect Transistor.
I have long suspected that if a successful homemade transistor were to be made, it might likely happen in the form of a FET. I have read of Roger Baker's homemade FET in the June 1970 Scientific American Amateur Scientist column numerous times and have thought about the simple architecture that can make a FET. This article illustrates that a FET can be made simply by running current through a thin film of the right type of semiconductor. If a flat conductor is put very near the semiconductor film and insulated from it, voltage changes between the flat conductor and the film will cause changes in the amount of current flowing through the film.
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