| 21. | The common mode voltage of the output voltages is not dependent of the input voltage.
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| 22. | As a result, the common emitter voltage and Q1 collector voltage follow the input voltage.
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| 23. | Typical input voltages are 5 V or 12 V and typical output readings are in millivolts.
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| 24. | These devices are often designed to be very linear over a wide range of input voltages.
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| 25. | The circuit is actually a buffered non-inverting amplifier driven by a constant input voltage.
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| 26. | The input voltage change is equal to the output voltage change divided by the amplifier gain.
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| 27. | If the input voltage changes from zero to negative, the voltage output voltage is positive.
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| 28. | If the applied input voltage changes from zero to positive, the output voltage is negative.
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| 29. | If can be made sufficiently small, these voltages can be several times the input voltage.
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| 30. | The current changes its direction, as the output voltage is higher than the input voltage.
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