Capacitor in NPN Transistor: Exploring Unknown Theory

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Discussion Overview

The discussion revolves around the role of a capacitor placed between the base and collector of an NPN transistor. Participants explore various theories and applications, including feedback mechanisms and filtering effects, while seeking clarification on the topic.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses uncertainty about the existing literature on the topic and requests explanations for the capacitor's role.
  • Another participant proposes that the capacitor may function as a feedback mechanism or a high-frequency filter.
  • A third participant critiques the initial inquiry for lacking detail, suggesting that a complete schematic is necessary for a thorough understanding.
  • Another participant mentions that in a three-stage audio amplifier, a coupling capacitor is typically used between the base and collector, theorizing it acts as a high-pass filter to provide local negative feedback.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as multiple competing views and theories are presented without resolution.

Contextual Notes

The discussion lacks detailed schematics and specific definitions, which may limit the clarity of the theories proposed. There are also unresolved assumptions regarding the function of the capacitor in different circuit configurations.

mearom
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What's about this? Where a capacitor is between base and collector (NPN). I have formulated some of my own theories (it seems like this is totally unknown of on the internet, and the books I've looked at don't explain it), but I have thought of flaws to all my theories. Can anyone please explain? Thankyou
 
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I think I thought of it

IS it just for feedback, acting as a really high freq filter?

Sometimes you just have to ask to know
 
Your post tells us basically nothing. You'd need to show us a complete schematic for us to be able to tell you why the capacitor is there.

- Warren
 
what is cc in vas?
 
In the voltage amplification stage of a three stage audio amp there is often a coupling capacitor connected to base and collector/ input and output. I think this is as a high pass filter so as to provide local negative feedback
 

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