![]() The shorter pin indicates the emitter, and it connects closer to a flat spot on the phototransistor’s clear plastic case. The longer of the two pins indicates the phototransistor’s collector terminal. Second, it also has two different length pins and a flat spot on its plastic case for identifying its terminals. First, if you connect the phototransistor in the circuit backwards, it won’t work right. The two devices do have two similarities. The phototransistor looks a little bit like an LED. Brighter light results in more current less-bright light results in less current. The brightness of the light shining on the phototransistor’s base (B) terminal determines how much current it will allow to pass into its collector (C) terminal, and out through its emitter (E) terminal. The drawing below shows the schematic and part drawing of the phototransistor in your Robotics Shield Kit. ![]() Depending on the type of transistor, the current flow can be controlled by voltage, current, or in the case of the phototransistor, by light. The third terminal controls just how much current passes through the other two. A transistor is like a valve that regulates the amount of electric current that passes through two of its three terminals.
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