Distortion, Gain, and Logarithmic Curves.?

Question

Does anyone know, exactly what in an amp causes distortion? And what does the gain button change, causing more or less distortion?
Also does anyone know, why the graph of gain vs distortion is a logarithmic curve?

Answer 1

Amps use nonlinear devices (like transistors or tubes) that inherently cause distortion but are to some extent "linearized" by negative feedback.
The gain control changes the amount of signal fed into an amplifier, or it may directly control the amplification in some designs, for instance by adjusting the feedback resistor in an op-amp. High-level distortion may be due to "overdriving" the amplifier (inputting too large a signal). In some applications overdrive distortion is eagerly sought after, and special controls are added to otherwise perfectly fine amps to produce it. An amplifier's output is limited by its output power capability and the gain limits of its earlier stages. Distortion can be a result of an overdriven output stage or earlier stage.
A logarithmic scale is often used to display audio data because the dynamic range being considered is so huge. For instance, a typical dynamic range might be 80 dB. This corresponds to a maximum-to-minimum power ratio of 10*8, or 100,000,000. A linear graph of distortion vs. power would be almost entirely devoted to the higher output levels, with the lower levels crowded at one end of the display. Since some kinds of distortion (e.g., crossover distortion) are worse at lower power levels, you would be unable to see how they change at those levels. If you are asking about a log shape to a gain vs. distortion curve, I'd need to see a more detailed description or a web page with a plot.

Answer 2

i assume which you already know some pre-calculus textile when you consider which you pronounced "asymptote" that are taught in pre-cal. Logarithmic curves pass very slowly as a results of fact the self sufficient variable (oftentimes x) will become extra beneficial. Its the alternative of exponential curves ( curves that pass very without put off like 2^n as x gets extra beneficial). If CO2 will boost logarithmically then effects could be very low for even great quantities when you consider that log. pass up very slowly. by way of the way; logarithmic curves do have asymptote on the 0 value; the different scientist could have self assurance that CO2 will boost by way of exponentially.