From: cd@notformail.com   
      
   On Sun, 25 Feb 2024 19:16:24 +0000, liz@poppyrecords.invalid.invalid   
   (Liz Tuddenham) wrote:   
      
   >Cursitor Doom  wrote:   
   >   
   >> On Sun, 25 Feb 2024 19:40:48 +0100, HW  wrote:   
   >>   
   >> >On Sun, 25 Feb 2024 18:01:19 +0000, 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   
   >> >   
   >> >Check if a diode in the bridge rectifier has failed.   
   >>   
   >> Good idea! I must admit I'd overlooked that possibility. I should have   
   >> checked the frequeny of the ripple whilst I was at it.   
   >   
   >The shape of the ripple will tell you if that has happened or if one of   
   >the diodes haas gone open circuit.  Another possibility is a fault in   
   >some other part of the circuit that is drawing too much current - you   
   >might smell something getting hot.   
      
   There's nothing getting hot, but the ripple had a definite saw-tooth   
   shape to it, which could be indicative of abnormal operation.   
   Shame there are no schematics available anywhere on the net; always   
   makes troubleshooting much harder.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)