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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