From: nojunk@knology.net   
      
   On 8/10/2018 12:26 PM, amdx wrote:   
   >   
   >    Is it reasonable/possible to build an 8 amp 20 V transformerless   
   > power supply from a 120Vac line.   
   >   I calculate about 180uf plus or minus depending on other components.   
   >   Maybe 9- 20uf caps in parallel?   
   >   I'd like to build it into a leaf blower.   
   >   All plastic, absolutely no metal exposed.   
   >   
   >   I think I've answered my question, I have 12, X rated caps in my junk   
   > box, but they are only 1uf.   
   > The cheapest 20uf I can find is $3, so $27 for 9 caps. Not reasonable.   
   >   
   >   Just had another thought, I could mount a power supply with   
   > transformer on the wall and have a cord go to the leaf blower. Just   
   > trying to build a light weight Leaf Blower for the wife to clean the   
   > garage once a week.   
   > Daughter gave me the leaf blower after the battery charger gave up.   
   >   
   >   Input encouraged.   
   >                   Mikek   
      
     I'm still thinking about simple Transformerless supplies for 20V 8   
   amps from 120vac.   
     I recalled this Third harmonic generator, it's design is for very low   
   power, but can it be increased? The design is for 10MHz to 30MHz, going   
   from 60hz to 180hz makes the inductors huge, but... any thoughts.   
   > https://bonlacfoods.com/pdf/018180621.pdf   
      
     Here's the two diode version.   
   > http://www.wenzel.com/documents/2diomult.html   
      
   Lots of reactive power, which means I'm not creating lots of heat.   
   But can it be made to work.   
      
                                 Mikek   
      
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