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Old 08-20-2010, 07:39 PM   #1
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car horn for telephone


question i need to hook up a car horn to my telephone in the work shop. i have a 12v horn and the dc 12v power it works hooked by it's self. now where do i hook it to the phone. need help. thanks. Carl.

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Old 08-20-2010, 11:17 PM   #2
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There is a better soluation for your situation.

Check out the link I provided.,

http://www.harriscomm.com/catalog/pr...ducts_id=18391

Here the other one there are quite few diffrent ones you can make a choice.

http://www.tele-movers.com/signaling...eflasherringer

Merci.
Marc

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Old 08-22-2010, 09:56 AM   #3
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question i need to hook up a car horn to my telephone in the work shop. i have a 12v horn and the dc 12v power it works hooked by it's self. now where do i hook it to the phone. need help. thanks. Carl.
You'd need to pick off the ringing signal without loading it down and
drive pretty heavy current into this car horn. There are contacts inside the horn which throw off a lot of radio frequency interference [which is not a problem inside the metal shell of a car].

The design and construction of an interface circuit that can do this is beyond the scope of this forum.
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Old 08-22-2010, 10:48 AM   #4
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car horn for telephone


you need something like this:

http://www.electronics123.com/s.nl/it.A/id.2667/.f

due to the voltage and frequency of the ring circuit, you need to insert a relay that uses that voltage and frequency to operate. You then use the relay to control the power to your horn.

and if you go to page 9 of this pdf, you will see the circuitry involved with this particular device:

http://www.electronics123.net/amazon...nual_k8086.pdf
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Old 08-22-2010, 12:07 PM   #5
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In production 95% or more of the circuits are required to work.
For onesy-twosy stuff that you don't mind tweaking, you could use just a single relay if you can make or buy one that reliably pulls in at the ringing voltage and frequency and has contacts that can handle your horn current.

Probably no one makes such a thing, if they ever did.

It's just too easy to use an interface circuit and a garden variety relay.
Electronic components nowadays are cheap and magnetic solutions to circuit design requirements are falling out of favor. Except, that is, for switch-mode power supplies and the saturable reactors known as "doorbell transformers".
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Old 08-22-2010, 01:26 PM   #6
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Normally the Ring cycle it will be about 90 volts @ 25 HZ otherwise during stand by mode it will be about 24 to 42 volts depending on what phone network.

I know you can rig up a relay but some products I proved on the link will work far much better than try to make a relay for it due I am almost total deaf so I have few products that help me and my family with it.

Merci,
Marc
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Old 08-22-2010, 03:43 PM   #7
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Normally the Ring cycle it will be about 90 volts @ 25 HZ otherwise during stand by mode it will be about 24 to 42 volts depending on what phone network.

I know you can rig up a relay but some products I proved on the link will work far much better than try to make a relay for it due I am almost total deaf so I have few products that help me and my family with it.

Merci,
Marc
Just clarify the voltages above the ring voltage it AC and standby voltage is DC.
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Old 08-22-2010, 04:02 PM   #8
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I am almost total deaf so I have few products that help me and my family with it.

24 to 42 volts
You should check if Volunteers for Medical Engineering (VME) has a chapter in your area. They are based in Baltimore and have an interesting history.
If they decide to take on your particular project they have many resources at their disposal, and it's free.
In MD there is also TAP; Technology Assistance Program.

As the baby boomers age there should be more products like this on the market.

BTW, ideally the max on-hook voltage is 14.4 vdc x 4; 4 ea. 12 v lead acid batteries in series.
I've measured the short circuit current at ~170 mA so for my house the upstream series resistance seems to be 50/0.17 = ~300 ohms. The characteristic impedance of phone lines is supposed to be 600 ohms but the 600 is the AC value, the transmission line value for voice signals.

The circuitry on page 9 of the pdf evidently starts to turn on at ringing signals above 40 v P-P, 14 vrms. R2 and C1 determine the minimum response ringing frequency but either the values are misprinted or I've made a calculation error.

Last edited by Yoyizit; 08-22-2010 at 04:23 PM.
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Old 08-22-2010, 09:33 PM   #9
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Hi,
Doing a search for 'telephone ringer interface' will generate results for some diy options as well as ready made devices.

-george
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Old 08-23-2010, 01:25 AM   #10
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Just clarify the voltages above the ring voltage it AC and standby voltage is DC.
Thanks for bringing it up I forgot to type standyby voltage on DC mode while ring is on AC mode { typically 25 HZ }

Merci.
Marc
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Old 08-23-2010, 01:27 AM   #11
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Yoyizit .,

I am not worry about that due I have too many gimzo over the years which I used for telephone ringer and teletypewriter with both modern and very old fashon unit.

Merci.
Marc
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Old 08-23-2010, 01:13 PM   #12
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but either the values are misprinted or I've made a calculation error.
Here's the problem: C1 is shown as 1 uF in one place and 470 nF on the schematic. 1 uF is a somewhat more reasonable value. Under the pressure to ship the product, updating the paperwork is not numero uno in priority. Whatever value was in the shipped product must be the one that works.


Last edited by Yoyizit; 08-23-2010 at 01:18 PM.
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