JohnSwenson wrote: > There are two primary goals of my PS design, one is to radically reduce > the noise injected back into the AC mains, and the other is that ripple > presented to the regulator be a very clean almost pure sine wave. Even > inexpensive regulators do very well with sine waves, and most regulators > do poorly with the high frequency content provided by most supply > designs. > > Most cheap linear supplies are frequently worse at these goals than good > switchers, but some switchers are REALLY bad. Since there is so much > variability between PS implementations it's hard to make > generalizations. > > There is a group that has latched onto "lab supplies". There is no > guarnatee that a lab supply will be any better either. I have measured > some lab supplies that inject just as much noise back into the mains as > other supplies. And some are very good. But just going to ebay and > getting the cheapest "lab supply" you can find is not going to guarantee > good results. > > The regulators in the Touch itself are particularly prone to input noise > in the 10KHz to 200KHz or so range, unfortunately a lot of the > inexpensive PS designs have a fair amount of noise in this region. This > is where special regulator designs such as the Teddy Regs etc shine, > they ARE good at suppressing noise in these ranges. With my PS I produce > a raw signal with almost nothing in this range so such regs are not > usually needed. > > John S.
+1 Some good thinking there ------------------------------------------------------------------------ Mnyb's Profile: http://forums.slimdevices.com/member.php?userid=4143 View this thread: http://forums.slimdevices.com/showthread.php?t=79977 _______________________________________________ Touch mailing list Touch@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/touch
