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  1. #1
    Join Date
    Jul 2005
    Location
    Oberon, NSW
    Age
    63
    Posts
    13,354

    Default Wiring an old extension phone bell

    So, I have an old phone extension bell that I'm looking at mounting in the shed and wiring to a push-button on the front door. A door-bell if you like.

    I vaguely remember these bells running on 70VAC (20Hz) being pumped down the line but I'm very far from sure; it's been decades since I played with them last. Does anyone remember the old Telstra specs?

    I wish I could just plug a wall-wart in series with the switch and bell but I suspect that's not feasible... most likely I'll set up an arduino with a small DC line to the door-switch and a separate circuit to the ringer.

    Anyone got alternatives or other advice?
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    I may be weird, but I'm saving up to become eccentric.

    - Andy Mc

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  3. #2
    Join Date
    Apr 2014
    Location
    Little River
    Age
    77
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    Default

    They are definitely an AC bell. The cheapest way to get them to ring is to feed them with a square wave generated with a pair of transistors.

    Here is a simple circuit but you will have to find a pair of transistors that will run at about 100V and create a DC supply to suit.

  4. #3
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
    Posts
    4,464

    Default

    I just bought a wireless unit for my shed from Aldi for $9.99. The door switch can be clipped on and off so I only clip it on when i’m In the shed.

    Additional.

    Found this discussion with diagrams. It may be of help

    https://www.vintage-radio.net/forum/...d.php?t=101915
    Last edited by Lappa; 3rd August 2018 at 08:52 PM. Reason: additional info

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