Telephone ringer circuit ?

[aalex]

Hi!
What is the best way to make 24 telephones ring ? I have gathered
quite a bit of information at http://wiki.dataflow.ws/RotaryChoir/TheCircuit
about this. See that page to know more.

My favorite way to it is with an audio signal, I think. If I do it
this way, which cheap amplifier can give me 90VAC ?

Thanks a lot !

aalex
(crossposting to sci.electronic.circuit and sci.electronics.misc)

 

[Stanislaw Flatto]

Hi!
What is the best way to make 24 telephones ring ? I have gathered
quite a bit of information at http://wiki.dataflow.ws/RotaryChoir/TheCircuit
about this. See that page to know more.

My favorite way to it is with an audio signal, I think. If I do it
this way, which cheap amplifier can give me 90VAC ?

Thanks a lot !

aalex
(crossposting to sci.electronic.circuit and sci.electronics.misc)

Hey!
You 'think' that you invented this problem. Try to investigate what
has/is done in exchanges of many connections which have to ring many
phones at the same time. A source of signal exist and is connected to
the phone that has to ring. In such configuration it is just to program
the sequence of connections- that's all.

Have fun

Stanislaw.

 

[Nico Coesel]

Hi!
What is the best way to make 24 telephones ring ? I have gathered
quite a bit of information at http://wiki.dataflow.ws/RotaryChoir/TheCircuit
about this. See that page to know more.

My favorite way to it is with an audio signal, I think. If I do it
this way, which cheap amplifier can give me 90VAC ?

According to the telephone specs, 16V AC (21V peak-peak) should make a
telephone ring.

 

[Joe G \(Home\)]

Do you have to make all 24 telephones ring at once or switched?

What is your exact requirement in this case.

Joe

 

[Gerard Bok]

What is the best way to make 24 telephones ring ? I have gathered
quite a bit of information at http://wiki.dataflow.ws/RotaryChoir/TheCircuit
about this. See that page to know more.

My favorite way to it is with an audio signal, I think. If I do it
this way, which cheap amplifier can give me 90VAC ?

Almost any
You just have to add a mains transformer, connected in reverse.
Connect the transformers output to the amplifier's speaker
output. Obtain the ring-voltage from the wires that where
intended to carry 'mains'.
Use some appropriate voltage ratio, e.g. 10 to 115 Volt or 24 to
230 Volt.

Keep in mind, that your ringer signal probably is -- or should
be-- 25 Hz. As the average transformer is intended for 50 / 60
Hz, don't load the transformer to more than say 30% of it's rated
power.

 

[aalex]

Hi !
Should I use a bridged amplifier, or simply a mono amplifier ?
I will try that trick with the 50W amplifier.

Thanks a lot !

a