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

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   Message 72,112 of 72,318   
   Phil Allison to bobenge...@gmail.com   
   Re: Confirmation needed   
   29 Aug 21 23:31:10   
   
   From: pallison49@gmail.com   
      
   bobenge...@gmail.com wrote:   
   >   
   > > ** Yep two:   
   > >   
   > > 1. The drop out voltage of a standard 12v reg IC is not 12.8 - more like   
   13.8.   
   > > 2. The AC supply varies and may be be 10% low on occasion.   
   > >   
   > > So, you need a 15VAC tranny.   
   > >   
   > > OR you can make a "voltage doubler" supply with two diodes and two   
   electros.   
   > >   
   > > That will give about 33V DC - minus the same deductions.   
   > >   
   >   
   > Thank you - that is helpful in 2 ways: pointing out what I missed &   
   > was wrong about, and even more helpful is not having to correct my analysis.   
      
   **   If your 12v tranny is really small, like say 100mA  -  it will output   
   about 15V to 16v  AC off load.   
      
        So would do at a pinch with a puny 10mA DC load .   
      
      
   .......  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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