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Telephone Hold Button

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  • Nicolae Sfetcu
    Telephone Hold Button ... Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a
    Message 1 of 1 , Aug 5, 2002

      Telephone Hold Button


      Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will find this circuit very useful. It is easy to build, and is compact enough to be installed inside the phone with no real problem. It is also powered by the phone line itself, eliminating the need for batteries.

      Schematic


      This is the schematic of the Phone Hold Button

      Parts


      Part
      Total Qty.
      Description
      Substitutions
      R111.5K 1/4 W Resistor
      R211K 1/4W Resistor
      D111N4002 Silicon Diode1N4003, 1N4004, 1N4005, 1N4006, 1N4007
      SCR11C106Y SCR
      LED11Red LEDGreen LED, Yellow LED
      S11Normally Open Push-Button Switch
      MISC1Wire, Board, Case (If Used)

      Notes

      1. To place a call on hold, simply hold down the button while hanging up the phone. To take a call off hold, just pick up the phone, or any extension.

      2. Even though this is a simple circuit, you may have to check with your phone company before use.

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