Phone Line to Audio

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This circuit uses an audio coupling transformer and a capacitor.

The primary windings add in series to 500 ohms. Instead of connecting them directly together, add a cap between them. It was something like 0.047 micro farads with a 600V rating. And the secondary which is 500 ohms runs into the control room mixer.

            Tip   >------------/ II 
                               / II /-------< 
       (primary winding 1)     / II / 
                               / II / 
                  >-----X------/ II / 
                        I        II / 
          0.047 uF      =        II / -----CT   (secondary winding) 
                        I        II / 
                 >------X------/ II /          Output Side to Mixer 
                               / II /                         
       (primary winding 2)     / II / 
                               / II /-------< 
         Ring    >-------------/ II 
  

Sources

  • tpappas[at]hamp.hampshire.edu

Category:Telephone

 

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