From: roger@hayter.org   
      
   On 25 Feb 2024 at 18:01:19 GMT, "Cursitor Doom"  wrote:   
      
   > So - in the case of a linear power supply - the rectified output of   
   > the transformer typically goes straight to a big old storage cap for   
   > smoothing purposes. My question is: how much ripple should I expect to   
   > see across that cap if all's working well? I have to say I'm seeing a   
   > *lot* of ripple on this cap in a Marconi RF signal generator and it's   
   > finding its way to the RF output, which of course should ideally have   
   > zero ripple on it. The aforementioned cap tests fine WRT ESR and   
   > capacitance in-circuit, I should add.   
   >   
   > Thanks,   
   > CD.   
      
   Usually there will either be a passive filter after the initial large   
   capacitor, such as an inductor in series and a further large capacitor to   
   earth, or an active voltage regulator circuit involving an amplifier and   
   series semiconductor, or both. A simple diode plus capacitor is always going   
   to have a huge amount of ripple, not hard to calculate if you know the current   
   load. But no electronic instrument is going to be powered just by a rectifier   
   capacitor combination. You need to look further into the circuit.   
      
      
   --   
   Roger Hayter   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)