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How to make a circuit to test ringers in rotary telephones ?

Discussion in 'General Electronics Discussion' started by Electric Al, May 24, 2015.

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  1. Electric Al

    Electric Al

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    Jan 16, 2014
    From 120 volt a/c or from a battery source .... how to make a ringer tester for rotary telephones , without a connection to a telephone line ?

    I have a ringer which requires 12 volt d/c primary and the secondary Vout is supposed to be 70 v r m s .

    I can not get any secondary output voltage at all , and I assume the circuit is open !

    It is intended to produce 70 V r m s (V out) and 3 W r m s (P out) at 20 Hz.

    Is there any other way to achieve the correct voltage I need to temporarily ring a rotary telephone ?

    Any help will be appreciated !
     
  2. Martaine2005

    Martaine2005

    3,514
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    May 12, 2015
    Is this the OLD rotary phone with the two large caps and relay/solenoid?
     
  3. Electric Al

    Electric Al

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    Jan 16, 2014
    Standard rotary Telephone eg: Northern Electric or Western Electric 500 series .
     
  4. Martaine2005

    Martaine2005

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    May 12, 2015
  5. Externet

    Externet

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    Aug 24, 2009
    I have done it maaany times, by connecting the telephone to 110VAC 60Hz with a 10K resistor in series to test ringers.. The telephone must be on hook or you will fry it.
     
  6. Electric Al

    Electric Al

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    7
    Jan 16, 2014
  7. Martaine2005

    Martaine2005

    3,514
    953
    May 12, 2015
    The pdf bottom right of the chip (under green button) is in English
    Martin
     
  8. davenn

    davenn Moderator

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    Sep 5, 2009
    you need to clarify that ... you cannot put DC into a transformer and expect an output voltage
    transformers require AC
    I'm referring to transformers because you specifically refer to primary and secondary

    Dave
     
  9. Electric Al

    Electric Al

    85
    7
    Jan 16, 2014


    I did not say that it is a transformer !

    It is a manufactured printed circuit device .

    I will locate it and post a picture !

    PowerDsine
    Ringer.
    P/N:pCR-SINO3V12F20-C
    Vin:12VDC
    Vout:70V rms
    Pout:3W rms
    Frequency:20 HZ

    MADE IN ISRAEL.

    Unit is 2" by 2" and 1/2 " deep .
     
    Last edited by a moderator: Jun 23, 2015
  10. davenn

    davenn Moderator

    13,837
    1,952
    Sep 5, 2009
    as I said ..... I only suggested that because you used the words primary and secondary ....
    these are used to describe a transformer

    this is why its important to be very clear describing something
    so that you don't make it even more confusing for those trying to help you :)

    and speaking of being clear ... did you not look at that pic before posting it ???
    its totally blurry and unreadable ... I have deleted it
    there's no point posting something that isn't readable ;)

    try again

    Dave
     
  11. Electric Al

    Electric Al

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    7
    Jan 16, 2014
    I realized the picture was blurry , and that is why I wrote all the info on the device .

    I probably should not have submitted the image , but that was the best I could do !
     
  12. davenn

    davenn Moderator

    13,837
    1,952
    Sep 5, 2009
    OK
    Im not wanting to be or sound harsh, just trying to help you OK :)
     
  13. Electric Al

    Electric Al

    85
    7
    Jan 16, 2014
    NO PROBLEM ! :cool:
     
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