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   sci.electronics.basics      Elementary questions about electronics      72,318 messages   

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   Message 71,714 of 72,318   
   Bob Engelhardt to Arie de Muynck   
   Re: Power in use indicator please ?   
   07 Jun 20 12:02:00   
   
   From: BobEngelhardt@comcast.net   
      
   On 6/7/2020 9:23 AM, Arie de Muynck wrote:   
   > On 2020-06-07 14:07, Bob Engelhardt wrote:   
   >> On 6/6/2020 3:35 PM, Pimpom wrote:   
   >>> This should work:   
   >>> https://www.dropbox.com/s/ablk0cc0iqfhsta/Load%20presence%20   
   ndicator.png?dl=0   
   >>>   
   >>>   
   >>> Diodes D1-D4 must be able to handle the load, including startup current.   
   >>   
   >> I like it.  KISS.  A small point: only need one of the D3/D4 pair.   
   >   
   > That would produce a small amount of DC in the pump voltage. Shaded pole   
   > motors are very sensitive to that - with some DC you can easily use them   
   > as brake. Better "Keep It Symmetrical [and] Safer".   
   >   
   > Arie   
      
   That's because the AC voltage in one direction would be a diode drop   
   different from the other direction?  So the dc voltage would be equal to   
   the diode drop, or is it more complicated than that?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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