Ring generator for telecom

[Andre Zanon]

Does anyone knows a component, simple and not expensive for generating
the ringing voltage for a telephone? Something that would, with a few
external components raise the voltage from around 5V or 12V to the
ringing voltage of a telephone?

 

[Michael A. Terrell]

Does anyone knows a component, simple and not expensive for generating
the ringing voltage for a telephone? Something that would, with a few
external components raise the voltage from around 5V or 12V to the
ringing voltage of a telephone?

Ring gemerators are availible, but they are not cheap. In the US you
need a 20 Hz sinewave @ 90 VAC. Is this a permanent application, or
temprary? A small PA amp with a 70 Volt line output and any 20 Hz
oscillator woll work.

If you can find a surplus Western electric or other brand of 1A2
style key telephone power supply made for your country, it will have the
right output.

<http://search.ebay.com/search/search.dll?from=R40&satitle=Ring+Generator+>
has some used and surplus items, as well.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Ryan Weihl]

Does anyone knows a component, simple and not expensive for generating
the ringing voltage for a telephone? Something that would, with a few
external components raise the voltage from around 5V or 12V to the
ringing voltage of a telephone?

google for "ring generator"

--

 

[Andre Zanon]

Andre Zanon escreveu:
Thanks, I will check,

This is a product we do in small quantities. Now I am using a
transformer that has 2 outputs: 10V CA and 40V CA, the second one I´ve
made a simple charge pump to generate the ring, and also the line
voltage 40V CC.
It is cheap this way, works well. But I am thinking about making
something better, but not very expenive.

Thanks again for the info,

André

 

[Salmon Egg]

Does anyone knows a component, simple and not expensive for generating
the ringing voltage for a telephone? Something that would, with a few
external components raise the voltage from around 5V or 12V to the
ringing voltage of a telephone?

This sounds like a job for a transformer. 5:1 step up transformer should be
adequate for stepping up 12VACrms to 60VACrms. I do not know for sure, but I
expect that would be adequate for ringing. You could use a 60Hz to do that,
but you must remember that the primary and secondary voltage ratings are
inversely proportional to operating frequency. That is, for a ringing
frequency of 20Hz, the primary should be rated for 36V while the secondary
should be rated at 180V.

Bill
-- Fermez le Bush

 

[Michael A. Terrell]

This sounds like a job for a transformer. 5:1 step up transformer should be
adequate for stepping up 12VACrms to 60VACrms. I do not know for sure, but I
expect that would be adequate for ringing. You could use a 60Hz to do that,
but you must remember that the primary and secondary voltage ratings are
inversely proportional to operating frequency. That is, for a ringing
frequency of 20Hz, the primary should be rated for 36V while the secondary
should be rated at 180V.

Real telephone bells require the right frequency to ring. The coil
and capacitor are a series resonant circuit, and in the days of party
lines, multiple users had different ring frequencies.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida