Author Topic: Ringing a landline Phone on stage  (Read 10563 times)

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Offline ianscott

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Ringing a landline Phone on stage
« on: February 08, 2015, 03:30:45 am »
Hey guys

I am doing a show where the phone has to be rung from off stage. I am having trouble finding any information on how these land line phones work.

The phone i want to ring is a normal Australian Landline phone with a RJ11 connector.

Does anyone know the voltages and such to ring a normal land line phone?

I have found this http://www.tele-q.com/operating.php which is exactly want but I the price is a bit high to ring a phone once or twice a show. Does anyone know how to do this simply and cheaply?

Thanks Ian
 

Offline Excavatoree

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Re: Ringing a landline Phone on stage
« Reply #1 on: February 08, 2015, 03:34:08 am »
I know the US ring signal is about 70 volts, at 20 Hz.  I can't imagine the Austarilian phones being very much different.

 

Offline jmole

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Re: Ringing a landline Phone on stage
« Reply #2 on: February 08, 2015, 03:35:36 am »
A quick search on google netted this: http://www.epanorama.net/circuits/telephone_ringer.html
 

Offline Muttley Snickers

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Re: Ringing a landline Phone on stage
« Reply #3 on: February 08, 2015, 03:48:29 am »
I have a Ring Master Pro Line Simulator, think I paid around $220.00
many years ago from a company in Melbourne, here's a link to the
manufacturer in Queensland.

http://www.natcomm.com.au/au/telephone-line-simulators/


Muttley

« Last Edit: February 08, 2015, 03:51:32 am by Muttley Snickers »
 

Offline dfmischler

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Re: Ringing a landline Phone on stage
« Reply #4 on: February 08, 2015, 03:53:40 am »
I have had one of these for many years: Viking DLE200B.  I originally bought it around 1995 to simulate a phone line between two modems for product development and testing.  Has run many thousands of cycles and is still reliable.  Mine is slightly different from the pictured version (reset button on front and DIP switches underneath).

I see several of these selling on ebay at this time: http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=dle200b&_sop=15
« Last Edit: February 08, 2015, 04:05:07 am by dfmischler »
 

Offline Muttley Snickers

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Re: Ringing a landline Phone on stage
« Reply #5 on: February 08, 2015, 03:55:42 am »
You also may be able to put a mobile phone along side a normal
handset, set the ring tone and ring it with another phone.

It's a bit dodgy, but if it all went wrong could be good entertainment.


Muttley
 

Offline Tac Eht Xilef

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Re: Ringing a landline Phone on stage
« Reply #6 on: February 08, 2015, 04:04:55 am »
Australian ring current is typically 16 or 25Hz, max 90-110v AC, with a cadence of 400ms on, 200ms off, 400ms on, 2s off.

If you just want it to ring then 18-24v AC should work on a short loop. For realism, the frequency might be critical - the tone of the electronic ringers in T200/T400/etc was much more dependent on the actual ring frequency than the bells or electronic ringers of the earlier 800-series.
 

Offline ianscott

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Re: Ringing a landline Phone on stage
« Reply #7 on: February 08, 2015, 04:09:54 am »
You also may be able to put a mobile phone along side a normal
handset, set the ring tone and ring it with another phone.

It's a bit dodgy, but if it all went wrong could be good entertainment.


Muttley

Yeah i did think of that, but the phone has to ring for a while, so manual control it is. Thanks anyway  :)
 

Offline Muttley Snickers

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Re: Ringing a landline Phone on stage
« Reply #8 on: February 08, 2015, 04:14:53 am »
What state are you in, and how long do you need one for.


Muttley

 

Offline ianscott

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Re: Ringing a landline Phone on stage
« Reply #9 on: February 08, 2015, 04:15:52 am »
If you just want it to ring then 18-24v AC should work on a short loop.

Can the handset be picked up when the voltage is going into the phone, or will it blow it up?

(Its annoying that the phone that i have being given I can't pull it apart and modify it)
 

Offline ianscott

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Re: Ringing a landline Phone on stage
« Reply #10 on: February 08, 2015, 04:18:53 am »
What state are you in, and how long do you need one for.


Muttley


Im in Victoria, about 2 hours from Melbourne. I need it for around 25/2/15 to the 15/3/15
 

Offline TerminalJack505

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Re: Ringing a landline Phone on stage
« Reply #11 on: February 08, 2015, 05:15:09 am »
If you're handy with electronics then it looks like you can make your own ringer circuit for peanuts.

The first two circuits on this page look like a good starting point.
 

Online NiHaoMike

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Re: Ringing a landline Phone on stage
« Reply #12 on: February 08, 2015, 06:22:37 am »
Easiest is to use a cheap VoIP adapter. Other than that, you might have some luck using a small isolation transformer (or an AC wall wart driving a small mains transformer in reverse) to get an isolated 100V AC or so.
Cryptocurrency has taught me to love math and at the same time be baffled by it.

Cryptocurrency lesson 0: Altcoins and Bitcoin are not the same thing.
 

Offline David_AVD

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Re: Ringing a landline Phone on stage
« Reply #13 on: February 08, 2015, 07:26:48 am »
I have a phone ringer box for sale that will do what you want.  Give me a PM if interested.
 

Offline Red Squirrel

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Re: Ringing a landline Phone on stage
« Reply #14 on: February 08, 2015, 11:36:22 am »
I can confirm it's at least 120v if higher.  I think it's actually 170v, but it's a lower frequency I believe.   Note to self: When reaching for a wire on a MDF, try not to have your face squished against a cable pair block. Out of 100 lines, there's a half decent chance someone is calling one of them.  :-DD


The device that makes the phone ring is called a ring generator, might be able to find one and see if you can make it work on it's own.  Normally they are plug in modules for the phone switch. Ex: DMS100.  They're on top of the line card drawers.  If I had to guess they produce a constant voltage, and the relay on the line card is what makes it go on and off.
 

Offline janoc

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Re: Ringing a landline Phone on stage
« Reply #15 on: February 08, 2015, 12:42:33 pm »
If it is for a stage, why just not gut the phone and put a normal DC door bell inside? Then you can ring it safely with a battery and a push button ...

Alternatively, you can pre-record the ringing noise and replay using a speaker installed in the modded phone.

I don't think that the requirement was that the phone has to work. Cheat, it is theatre! And you also avoid having to tinker with high voltage circuitry - temporary wiring, often taped down and installed far from acceptable standard as is often the case in similar circumstances is only asking for someone getting accidentally zapped or something getting shorted and smoking. Not worth the trouble, IMO!

 

Offline Pjotr

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Re: Ringing a landline Phone on stage
« Reply #16 on: February 08, 2015, 01:13:26 pm »
The ring signal is a burst of 60V - 100V Rms. Here it is at 10 Hz. Google for a free SW tone burst generator, feed the signal to an audio amplifier en drive the phone with a reversed small mains transformer to step up the voltage
 

Offline G7PSK

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Re: Ringing a landline Phone on stage
« Reply #17 on: February 08, 2015, 04:15:08 pm »
You could get an old field telephone, they had a crank on the side that generated the ring pulse.
 

Offline ianscott

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Re: Ringing a landline Phone on stage
« Reply #18 on: February 10, 2015, 01:55:44 am »
hey guys,
The phone needs to be a digital sounding one (not a old school bell). The phone is very similar to this one pictured below.

Thanks
Ian
 

Offline calexanian

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Re: Ringing a landline Phone on stage
« Reply #19 on: February 10, 2015, 03:03:19 am »
Typically the type of phone pictured there has either a large zener or a neon or gas spark gap tube with the yelping circuit in series with it and it yelps along with the low frequency ring signal. 90 volts is what it takes here in the states to get them to ring. Look up a ring generator. You can get them second hand online. Be careful though. They can zap you and knock you on your butt pretty good! Old fashioned bell ring telephones just have the coil to the clapper arm of the ringer connected across the line. This had two purposes. One, the phone will instantly ring when the ring signal comes, and two tells the telephone company a phone is connected by keeping the circuit closed. The audio signal is so low it does not move the clapper enough to ring. On some old phone designs the clapper was sensitive enough that you could hear the audio off of it like a speaker if the design did not take it out of the circuit when the receiver was off the hook.
Charles Alexanian
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Offline miguelvp

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Re: Ringing a landline Phone on stage
« Reply #20 on: February 10, 2015, 05:46:17 am »
Someone already mentioned a VOIP device. I would recommend a MagicJack but that's for the US only so you'll need a 2nd one so it would be a local call or get someone from the US to ring you :)
 

Offline lincoln

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Re: Ringing a landline Phone on stage
« Reply #21 on: February 10, 2015, 05:53:27 am »
Hello,
I have done this in the past, #1. for simplicity is a field phone with a crank. #2 was wire an audio amp and have a signal generator audio test CD with a 20 Hz tone. Bonus points that it can be controlled via the sound board.

link
 

Offline cc83

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Re: Ringing a landline Phone on stage
« Reply #22 on: February 10, 2015, 07:45:30 am »
hey guys,
The phone needs to be a digital sounding one (not a old school bell). The phone is very similar to this one pictured below.

Thanks
Ian

Even easier. Why not just use a uc and program the ringing tone, then just use a pin to signal the uc to turn the tone on, you could easily program a attiny85 (or other uc) to output the tone to a amplifier, if the phone is on a desk or anything you can hide the electronics and speaker in there. You could even use the line to the phone for signaling.

I assisted a production years ago where there was a ringing phone needed and it was hard to hear one on stage so we wound up playing it through the sound board. If you want it to sound like it's coming from the phone on stage you can see if the sound guy can use some creative mixing to give that illusion.
« Last Edit: February 10, 2015, 07:47:57 am by cc83 »
 

Offline calexanian

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Re: Ringing a landline Phone on stage
« Reply #23 on: February 10, 2015, 11:05:55 pm »
Or a bell ringer that sounds like a telephone bell and use a 555 to cycle it on and off when somebody pushes a button offstage.
Charles Alexanian
Alex-Tronix Control Systems
 

Offline calexanian

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Re: Ringing a landline Phone on stage
« Reply #24 on: February 10, 2015, 11:06:46 pm »
Or better yet just record the sound of a telephone ring, or fine one online and just play it!
Charles Alexanian
Alex-Tronix Control Systems
 


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