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Results tagged with transistors
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user 20134
A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).
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Understand transistors
A transistor is [sort of] a variable resistor. At it's most extreme, it's either a total short or infinite impedance [ie. an open or closed switch].
Put a transistor in series with a standard resisto …
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Basics of Transistors
The more elaborate the model, the more accurate the response you calculate. However, sticking with basic Common Emitter NPN:
Two resistors on the base, act as a voltage divider. Generally, they are …
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Transistors why does increasing base current increase collector current?
Imagine, a water tank. Water is not going to jump out - that's the same a a standard base-emitter junction.
Now imagine... tilting the tank on its side, to fill a water cup (or a hose with a funnel on …
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What is meant by pinch-off voltage?
Background: "Pure" silicon (or germanium) is an insulator. This can be "doped" to become P or N material.
If you have P and N material forming a junction, the doping types will cancel each other out l …
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3
votes
Use transistors to amplify a very small voltage
Yes, you can do this with just NPN transistors. 60mV is small, but probably enough. …
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what exactly is biasing in transistors and how to do biasing
The actual design is NPN where the middle "P" is the base. The base-collector is reverse biased.
Mental picture time: if you forward bias the base-emitter, just a little, some electrons will flow from …
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what does it mean for a to BJT operating at the edge between the active and saturation modes?
Once a junction gets saturated, it takes awhile for it to react and come out of saturation. I believe this is where the "Charge Control" model, or Gummel-Poon model, comes into play.
The time delay f …
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Can I use an RF transistor at a lower frequency?
The datasheet I found for this, only shows input and output impedance over a small range. Once you get down to 40 Hz (edit: 40MHz) and lower, things will be significantly different.
You can use stripl …
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