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Hallo, I have a very basic question about transistors. If you simplify a transistor, it is really just a switch? What I am trying to do use use a small voltage as an input to trigger something, but I am not sure how to do this.The low voltage input triggers the transistor which makes the other part of the circut work(a small lamp and a 5v power source), I have tried connecting the different parts in many ways, but I always get the same result. Either the light is always shining (no matter if it gets an input from the small voltage or not) or it is never shining.Could someone please help me with how to connect this? Or is it even possible?Thanks
ideally you can use a transistor just like a short-circuit or an open-circuit, just depending on the difference of potential between gate and source.
Quote from: alessio136 on April 03, 2008, 11:14:21 AMideally you can use a transistor just like a short-circuit or an open-circuit, just depending on the difference of potential between gate and source.Yes, but only for FET transistors. BJT's are a bit messier in that regard. For BJT current WILL flow from the base to the emitter, so you must place your lamp on the collector side (the side without the arrow in the schematic) if you want a clean switch.
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