From: muratlanne@gmail.com   
      
   "Johnny B Good"  wrote in message   
   news:WBKoE.1387367$OGY.740967@fx08.am4...   
   > On Sat, 30 Mar 2019 08:12:55 -0500, ads wrote:   
   >   
   > ====snip====   
   >   
   >>   
   >   
   > If you're trying to describe the flat topped peaks[1], typical of   
   > utility power worldwide, that's just the result of all the countless   
   > smpsus used in TV sets and desktop computers and USB wallwart   
   > chargers   
   > and laptop charging bricks and... well, let's just say there's a   
   > hell of   
   > a lot of mains powered kit that rectifies the mains supply to   
   > generate   
   > whatever dc voltages are needed (whether it be directly at full   
   > mains   
   > voltage or on the low voltage secondary of a stepdown isolating   
   > transformer such as an old school battery charger.   
   >   
   > ...   
   > --   
   > Johnny B Good   
      
   There are also spikes from SCR and Triac switching which can be   
   anywhere including near the zero crossings. I had trouble with them on   
   industrial park electricity when trying to construct a low phase noise   
   line-synched PLL reference oscillator.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)