Originally Posted by HolyCheese
How would AC to DC increase your voltage? How can it magically become more, I always tought that when you converse AC to DC it becomes less because it's a sine wave and you have to take the average.
This tool seems to agree with me: http://easycalculation.com/physics/electromagnetism/ACtoDC.php
That webtool calculates potential current, not voltage.
DC Voltage is sqrt2 *AC voltage, as Tomb posted above.
The O2 has 2 half-wave rectifiers in it, followed by positive and negative regulators.
The O2 PSU makes a two rail +/- 12volt supply from a single AC input. When selecting
transformers, 12v AC is enough for the PSU overhead in the O2, provided the transformer
has enough current capacity. There is no benefit in going with extra voltage or current
capacity in the transformer used. A 12vac 400mA wau12-400 is plenty of transformer.
More voltage just heats the regulators and more current goes unused.
The PSU design in the O2 is a little wonky IMO. It goes against common practice to use
half wave rectification for audio, because of the ripple generated compared to full wave. The
fact that the rails are powered by +/- 12 volts from the mains, or +/- 8.4 volts from the
batteries is a bit wonky as well because of the amps clipping behavior. If you get the gain
setting right for the rail voltage and source used, it obviously works well. The problem
comes from the lack of understanding among typical consumers, as evidenced by the
numbers of posts from owners hearing clipping and not understanding its source.
It would be nice if the designer would finish the design into a nice desktop format more
suitable for the general consumer.
Edited by bada bing - 5/27/13 at 2:27pm