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   sci.electronics.design      Electronic circuit design      143,102 messages   

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   Message 141,426 of 143,102   
   Cursitor Doom to Liz Tuddenham   
   Re: Blown Resistor?   
   30 Nov 25 22:08:35   
   
   From: cd6699@notformail.com   
      
   On Sun, 30 Nov 2025 19:51:28 +0000, liz@poppyrecords.invalid.invalid   
   (Liz Tuddenham) wrote:   
      
   >Cursitor Doom  wrote:   
   >   
   >> I posted this for opinions on S.E.R so apologies to those like Jeff   
   >> who frequent both groups. SED's got a wider readership, so I thought I   
   >> might as well ask here as well.   
   >> I'm just wondering if this damage was due to over-current or just a   
   >> manufacturing defect. It still reads its advertised value of 1200   
   >> ohms. What does the Panel think?   
   >>   
   >>   
   >> https://disk.yandex.com/d/ommuYJD2ZKsW8A   
   >   
   >If we assume a relatively small overload of 10 W was sufficient to caue   
   >the damage, that corresponds to over 100 v across the resistor.  Where   
   >would a voltage like that come from in that machine?   
   >   
   >In practice I would expect is would take an even greater instantaneous   
   >overload than 100v to instantly blow a hole, rather than a sustained   
   >overload which would gradually cook the whole thing.   
      
   The highest voltage in that thing is 90V p-p at 100kHz from the bias   
   oscillator, but it's nowhere near the AGC.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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