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   RAILFAN      Trains, model railroading hobby      3,261 messages   

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   Message 636 of 3,261   
   Larry Sheldon to mroberds@att.net   
   Re: Trains Magazine--"modern streetcar"    
   20 Jun 14 17:35:30   
   
   From: lfsheldon@gmail.com   
      
   On 6/20/2014 3:45 PM, mroberds@att.net wrote:   
      
   >> Side note about capicitor size:  Landline telephone sets have always   
   >> had a capcitor to separate the 20 Hz ringing current from the 48V DC   
   >> signal and talk power.   
   >   
   > Well, 48 V at the exchange.  Maybe 5 V by the time it gets all the way   
   > out to your off-hook telephone.  :)   
      
   Not sure if there was a point here or not--I didn't find it.   
      
   But in the interest of historical accuracy, the capacitor in question is   
   important when the telephone is ON-hook and the DC voltage is pretty   
   close to 48 volts, but more interesting is that's job is to pass the   
   105V 20 Hz (most common) ringer current.   
   >   
   --   
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