Timeline for Is there a difference in the meaning of power and current amplifier terms?
Current License: CC BY-SA 3.0
6 events
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| Jan 19, 2016 at 22:47 | history | edited | William Brodie-Tyrrell | CC BY-SA 3.0 |
added amplifier schematic showing stages.
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| Jan 19, 2016 at 22:41 | comment | added | William Brodie-Tyrrell | And yes, an audio amplifier is usually designed as a voltage source. Not constant, but certainly voltage-controlled. Look at any classic amplifier design, e.g. Doug Self, douglas-self.com/ampins/dipa/dpafig33.gif and note the emitter-follower output stage. It has NO voltage gain. | |
| Jan 19, 2016 at 22:38 | comment | added | William Brodie-Tyrrell | output impedance is a function of circuit construction, and a voltage amplifier does not by definition have a low impedance. If it did, there wouldn't be an emitter-follower stage after the VAS stage in an amplifier, would there? You could throw all the most expensive parts away and just keep the voltage gain stage... but that doesn't work because its output impedance is too high. Just because you don't understand an answer doesn't make it wrong. | |
| Jan 19, 2016 at 13:43 | comment | added | Matt Young | A "voltage amplifier" should NOT have a high output impedance. In fact, it should be close to zero. Further in a "Current amplifier", "The purpose of the final stage is to provide enough current to the load so that the load's voltage follows the open-circuit voltage of the amplifier..." is just plain wrong. That is a constant voltage not constant current. | |
| Jan 19, 2016 at 13:15 | history | edited | William Brodie-Tyrrell | CC BY-SA 3.0 |
added 574 characters in body
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| Jan 19, 2016 at 13:09 | history | answered | William Brodie-Tyrrell | CC BY-SA 3.0 |
