From: pcdhSpamMeSenseless@electrooptical.net   
      
   On 2026-02-24 15:00, Someone wrote:> The classical 1970s preregulator   
   design should do it if you're   
    > contemplating using the 337 on the basis of 317 PSRR specs. That would   
    > be using the final output as the input to the ADJ on the pre-reg. You   
    > should be able to get away with 3 Volt headroom, a bit more than the   
    > stock 1.5V.   
    >   
      
   Thanks.  Unfortunately I'd need three LM337s to get the sort of PSR   
   required. :(   
      
   They really stink.   
      
   The LCR filter plus shunt-regulator-supervised cap multiplier is the   
   fallback position if the TCA0372's negative-supply rejection isn't up to   
   the job.  (I need to measure that tomorrow.)   
      
   Cheers   
      
   Phil Hobbs   
      
   --   
   Dr Philip C D Hobbs   
   Principal Consultant   
   ElectroOptical Innovations LLC / Hobbs ElectroOptics   
   Optics, Electro-optics, Photonics, Analog Electronics   
   Briarcliff Manor NY 10510   
      
   http://electrooptical.net   
   http://hobbs-eo.com   
      
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