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Discussion in 'General Electronics Discussion' started by Ddavid, Aug 30, 2017.

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  1. Ddavid

    Ddavid

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    Aug 30, 2017
    Hi I was wondering if anyone can help me with a project I am having problems with. I have had built a telephone ringing system with mp3 player and remote Relay and some delay timers .the system allows me to remotely make a telephone ring and then when I lift the receiver the ringer stops and a message is played from the mp3 player. The problem I am having is with a relay that for some reason sometimes it makes the phone ring like a normal phone is meant to or it can do a constant ring and when the receiver is lifted I get interference. The whole system is run from a 12V Battery. hope this makes sense if you need any more info or photos please feel free to ask Thank you
     
  2. Arouse1973

    Arouse1973 Adam

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    1,087
    Dec 18, 2013
    Hello and welcome to E.P. Do you have any information on the circuit that is used. Do you have a circuit diagram we can see and maybe some nice pictures of the unit. It's hard to tell just from a description of a fault.
    Thanks
    Adam
     
  3. Ddavid

    Ddavid

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    Aug 30, 2017
    Hi thank you for replying I don't have a diagram as another guy built it for me for now he wont help me but ill post as many photos here as I can here in a few mins
     
  4. Ddavid

    Ddavid

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    Aug 30, 2017
    for some reason it wont let me add photos at the moment
     
  5. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Ah it might be because you haven't sent enough messages yet. Also check the file size.
     
  6. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    I'll ask our wonderful Beaker (Ian) the main man to see if he can help. @Ian can you help the OP upload some pictures please?
    Thanks
    Adam
     
  7. Ddavid

    Ddavid

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    Aug 30, 2017
    Arouse1973 likes this.
  8. davenn

    davenn Moderator

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    there should be no problem posting unless your are posting wrong type or too large an image

    use jpg,1000x 700 max size and 100kb max
    images can be posted in some one's first post
     
    Ian and Arouse1973 like this.
  9. Ddavid

    Ddavid

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    Aug 30, 2017
    is 33.3mb to big to send
     
  10. davenn

    davenn Moderator

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    what do you think?

    it's a zillion times bigger than what I stated above
     
  11. Ddavid

    Ddavid

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    Aug 30, 2017
    OK sorry I'll retake photos tomorrow and upload again if that's ok
     
    Arouse1973 and davenn like this.
  12. davenn

    davenn Moderator

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    Sep 5, 2009
    use a graphics program like Irfanview to resize and compress the image

    load your image into it and resize it down to 1024 x 768
    then save as it with 60 - 70 quality setting
     
  13. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Thanks Dave.
     
    davenn likes this.
  14. Ddavid

    Ddavid

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    Aug 30, 2017
    photos as requested thank you 20170830_202029_resized.jpg 20170830_201922_resized.jpg 20170830_201908_resized.jpg 20170830_201901_resized.jpg 20170830_201930_resized.jpg 20170830_201940_resized.jpg 20170830_202005_resized(1).jpg
     

    Attached Files:

    Last edited by a moderator: Aug 31, 2017
  15. kellys_eye

    kellys_eye

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    Jun 25, 2010
    I take it you are holding the 'remote' device to activate the phone ringer system yourself?

    I take it that the 'constant ring' is NOT correct and that a normal ring is required at all times?

    What form does the interference take? Buzz? Hum? Hiss? etc?

    Unfortunately the pictures aren't, as the saying goes, worth a 1,000 words. In this case they might amount to around 4 viz-a-viz........"Jeez, what a mess". :D

    We would really need to see, clearly, what wire goes from point (a) to point (b) etc. The cable-tied bundle doesn't help either. Any way you can separate the modules so we can see the path of the individual wires? Similarly, any more detail on the timer relays at the top?
     
  16. Externet

    Externet

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    Aug 24, 2009
    The pictures do not help to discern much. The little information I can tell is

    There has to be somewhere a ´ĺoop' current sense relay implemented. That must deenergize the ring generator (ringen) [PowerDsine] module or its 70VAC output will likely destroy earphone and something else as the high voltage AC gets into the receiving end and into the MP3 audio output stage. That can be the 20Hz 'interference' you hear.

    The proper one---> http://www.ic72.com/pdf_file/m/25990.pdf

    The ring generator (ringen) has to be driven by a cadence timer of choice, or constant if preferred. But the current relay linked must deenergize it and terminate the cadence timer when the handset is lifted off-hook, and make the MP3 'play'

    If you can instead of pictures, post a block diagram sketch, will be more helpful. I could do a block diagram 'my way' but will not match to fix yours.
     
  17. Ddavid

    Ddavid

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    Aug 30, 2017
    this is all I have accept it does not show timers or black 4 pin relay in photo the guy who built it said he needed them added after he made diagram so I got a dring dring snd the relay was something of do with the mp3 player thank you received_10214305781142701.jpeg 20170830_201940_resized.jpg
     
  18. Ddavid

    Ddavid

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    Aug 30, 2017
    one thing that diagram does not mean much to me
     
  19. Externet

    Externet

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    Aug 24, 2009
    It does has some meaning... The black wire to 'ringen' must be disconnected by 'relay2' 'when rl1' engages. Could be done with a SPDT relay, but, hey, there is maaany ways to do it.
    I have no idea why 'in1' in the relay unit is hooked to audio, if it is supplying '-12V' or what to '5'

    The 'manual' pusbutton forces ringeneration if 'rl1' is on, the same relay that enables the audio player. Not a good idea if the player is active, and the handset is off-hook. Make sure it is open, not faulty stuck 'on'.

    I see no way to sense the 'loop current' (handset being picked up) Do you think it is 'in1' ?

    "-12V" cannot be minus 12Volt. Otherwise the ringen and a lot more would get 24 V. I take it as "the negative of +12V"

    To fix anything, you and we have to know how it works. There is other things hiding from us in the sketched blocks. Perhaps someone else can see light ?

    Have you confirmed the MP3 audio source alone is good with headphones plugged to it ?
     
    Last edited: Sep 1, 2017
  20. Ddavid

    Ddavid

    10
    3
    Aug 30, 2017
    all the setup does is once I press A button on my remote the phone rings dring dring then once I lift receiver the ring stops and mp3 swithese on and is triggered to play a message then one reliever is put back on the hook the mp3 player gets switched off. hope thst helps
     
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