From: pcdhSpamMeSenseless@electrooptical.net   
      
   Lasse Langwadt  wrote:   
   > On 12/23/25 20:33, john larkin wrote:   
   >   
   >>   
   >> 317/1117 regs don't like ceramic loads.   
   >>   
   >   
   > the 317 should be much more stable, they must be quite different, the   
   > 317 is twice the dropout of the 1117   
      
   Different vendors’ parts have different stability properties, and it   
   depends on the output voltage.   Twenty microfarads with 5 mΩ ESR can   
   easily make a 317 sing.   
      
   JL’s trick is to put 10nF across the top resistor, which gives enough phase   
   lead to stabilize the loop even with big ceramic caps.   
      
   Another good approach is to use a huge wet-Al output cap as a lead-lag   
   network.   
      
   Cheers   
      
   Phil Hobbs   
      
   --   
   Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /   
   Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics   
      
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