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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.       >       --       Idioten aangeboden. Gratis af te halen.       h/t Dagelijkse Standaard              --- SoupGate/W32 v1.03        * Origin: LiveWire BBS -=*=- UseNet FTN Gateway (1:2320/1)    |
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