Recent content by COffin

  1. C

    Not enough current to trigger relay.

    Hi Martin, The phone is a Vingtor DT-700 Phone Series that is manufactured by Dial-Tone Industries Private Limited. I couldn't find anything online resembling it when I searched for it. The phone system here operates via a phone exchange(Zenitel SMP 200) that has 48Vdc output constantly whether...
  2. C

    Not enough current to trigger relay.

    Thanks for all the help everyone but I don't think any of this will work anyway. When I was measuring the current for the horn circuit, I noticed that ringing wasn't continuous, it has its own circuit that creates a 2 second on and off sound. So if I want this to work, I would have to integrate...
  3. C

    Not enough current to trigger relay.

    Please excuse the crude drawing but would this work? Also these are the transistors I have on hand: TIP120 IRL520N LM7915CT 2N3904 D882-Y LM317T
  4. C

    Not enough current to trigger relay.

    Hi All, I'm currently having trouble with a phone system and I just don't have enough electronics background to solve this problem. I have a phone that is supposed to activate an external horn. The horn is part of a separate system and can be energized by a 24Vdc source. Inside the phone I...
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