| 11. | Output impedance is 50, 500 ohms.
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| 12. | Negative feedback in an amplifier lowers its effective output impedance and thus increases its damping factor.
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| 13. | The actual output impedance for most devices is not the same as the rated output impedance.
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| 14. | The actual output impedance for most devices is not the same as the rated output impedance.
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| 15. | Solving for the output impedance gives:
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| 16. | However, most of these will be improved by lowering output impedance and hence improving damping factor.
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| 17. | The transformation ratio is the ratio of the input and output impedances of the impedance matching network.
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| 18. | Therefore, feedback has no effect on the output impedance, which remains simply " R"
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| 19. | In contrast, modern transistor amplifiers can have very low output impedance, enabling lower-impedance headphones.
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| 20. | The chip also had higher output impedance, requiring heavier external noise filtering circuitry but outputting louder sound.
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