Clipping Detector Circuit Design

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Discussion Overview

The discussion revolves around the design of a clipping detector circuit for an audio equalizer project. Participants explore methods to implement the detector using simple components, particularly focusing on the use of transistors, comparators, or operational amplifiers.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about implementing a clipping detector using a transistor and seeks guidance on calculating switching values for the transistor.
  • Another participant suggests considering the definition of clipping in relation to power rails and proposes using a comparator or op-amp for detection.
  • A later reply questions the likelihood of the signal exceeding the supply rails and discusses how to set the comparator or op-amp to trigger at a voltage below the supply rail.
  • One participant asserts that since their output is capped at around 2V with supply rails of ±12V, the chance of exceeding the rails is minimal and suggests using a voltage divider to manage potential clipping.
  • Another participant confirms the validity of using a voltage divider and mentions that more advanced circuits may incorporate features like noise rejection and dynamic threshold settings.

Areas of Agreement / Disagreement

Participants express varying approaches to implementing the clipping detector, with some proposing the use of transistors and others suggesting comparators or op-amps. There is no consensus on the best method, and the discussion remains open to different techniques and considerations.

Contextual Notes

Participants have not fully resolved the specifics of component values or configurations for the clipping detector, and assumptions about signal behavior and circuit design remain unexamined.

swuster
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Homework Statement


I am building an audio equalizer as a project for class, consisting of a summing amplifier with variable gain for the bass, midrange, and treble frequencies. I also have the option to include a clipping/overload detector, though I have already chosen parameters that will not allow the output to go over 2 volts, given a maximum 3V input.

[edit] To clarify, I've already built the equalizer; I'm just trying to implement the clipping detector.

Homework Equations


n/a

The Attempt at a Solution


Could I implement this with a transistor, and if so, how? One of the stipulations of the assignment is also to use as few and as simple components as possible, so is there a solution comprised of solely R(L)C components?

I'm not really sure how to calculate the values at which current in a transistor are switched, so if I could get some pointers that would be helpful. Thanks!
 
Last edited:
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Well, since this is homework, I'll just give you a hint: what is the definition of clipping (relative to your power rails) and how might you use, say, a comparator or op-amp to detect this?
 
Ah...wonder why I didn't see that before...

Thanks!
 
swuster said:
Ah...wonder why I didn't see that before...

Thanks!

Experience. Also, TA'ing a senior, build-yourself-some-electronics lab. Actually, I forgot a point. What's the likelihood that your signal will exceed your supply rails? How would you go about getting the comparator / op-amp to trigger at a voltage a little less (maybe a lot less, depending on your expected maximum output voltage) than your supply rail?
 
Since the output is never more than around 2V, very little chance, as my rails are set to 12 and -12 Vcc. If it did, I could just make a voltage divider by running a resistor with an appropriate value to ground, right?
 
swuster said:
Since the output is never more than around 2V, very little chance, as my rails are set to 12 and -12 Vcc. If it did, I could just make a voltage divider by running a resistor with an appropriate value to ground, right?

That's correct, and is basically how most of these circuits works. They get fancier by doing things like noise rejection, triggering only if it clips for a certain interval, dynamic threshold setting, etc.
 

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