| 1. | It is measured by connecting the electrodes to a voltage amplifier.
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| 2. | Voltage amplifiers and current amplifiers have different topologies for best noise characteristics.
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| 3. | Often this circuit is selected when a voltage amplifier is wanted at the output.
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| 4. | Voltage amplifier valves not operating at high power are not affected in this way.
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| 5. | Practically all commercial audio amplifiers are voltage amplifiers.
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| 6. | Op-amps are differential voltage amplifiers with very high gain ( sometimes modeled as infinite gain ).
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| 7. | A feedback voltage amplifier using an op amp with finite gain but infinite input impedances and zero output impedance.
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| 8. | A simple example of the use of feedback is the op-amp voltage amplifier shown in the figure.
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| 9. | The common base circuit stops behaving like a voltage amplifier and behaves like a current follower, as discussed next.
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| 10. | So, for example, an op amp ( voltage amplifier ) can be arranged to make a current amplifier instead.
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