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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Thinking about 120V and 240V difference.Posted by Romy the Cat on: 12/23/2011
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 Romy the Cat wrote: |
| The point that you have EU (240V version) is well taken.... |
|
LX,
I wonder if in context of dimmer and PurePower regenerators the voltage of a given country make any difference. PurePower is essentially a power amplifier. Since both 120V and 220V use the same battery, let say 72V then PurePower unit need very little gain to get 120V and much higher gain to get 220V. I do not know what is the difference between 120V and 240V inverter but it has to be a LOT of difference and I would not be surprised if they use even different output stages, different DC/DC converters, or more stage to get higher voltage.
With the dimmers it is also a bit different, I mean not restive one but those digital dimmers that chop the sine waves. The more chopping the more harmonic distortions come to the line and my presumption that at 120V and 240V the chopping is not in percentage but in amplitude. So 50% chopped 120V light bulb might be lit with the same brightness as 50% chopped 240V light bulb. However, the amount of amplitude chopping in 240V case is higher and consequently it will have twice more hamonik distortion for the same 50% of voltage chopping. If the dimmer uses the semiconductors arranged in a triac then it is very much the same. In those dimmers there are even more problems as in addition to chopping voltage it does it so abruptly that it vibrate entire waveform. At higher voltage amplitude the vibration of waveform more severs and in very high voltage it can even to be a source of radio distortions.
So, it is possible that at 120V we have some advantage in the way how our dimmers affect sound and how our regenerators help to deal with it.
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