Mnyb wrote: > Was not that the design rationale behind the power supply John Swenson > designed ? As such interaction can come from traditional power supplies > to . > > There is to much subjective bias anyway as no one reports worse > performance with any third party ps :) all linear power supplies are not > good and switch mode power supplies are not inheritly bad . > > So why search for a " cheap linear supply" if one wants a cheap supply > that is good ,switch mode is the obvius choice .
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. ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 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
