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

Electric Al

Jan 16, 2014
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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 !
 

Martaine2005

May 12, 2015
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Is this the OLD rotary phone with the two large caps and relay/solenoid?
 

Electric Al

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

Externet

Aug 24, 2009
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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.
 

davenn

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Sep 5, 2009
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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 !

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
 

Electric Al

Jan 16, 2014
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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


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:

davenn

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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
 

Electric Al

Jan 16, 2014
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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 !
 

davenn

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OK
Im not wanting to be or sound harsh, just trying to help you OK :)
 
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