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How to connect an old tel. bell to door bell.

by nichosi / September 19, 2012 5:27 AM PDT

I have an old Telefone very loud Bell & want to connect it to the gate small bell (which i cannot hear).

I wish I could attach a foto here, but it has 2 2" bells, silvery cylinder el. component 3" long, 2 electromagnets 2" long & 10 screw connectors for wires.

It used to work untill a disconnected it & now use cordless telefone.

Does anybody have a cristall ball to see it & advise if I can use it as a gate bell? .....thanx ......nick

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by R. Proffitt Forum moderator / September 19, 2012 5:36 AM PDT

The problem here is that we have a few issues to solve. The first is understanding that the really old ringers required a signal from the telephone company so let's find out what that signal was. (I'm going to use duckduckgo instead of google here.)

AHA, we find out it matters what COUNTRY this Telephone is from. You spelled it as "Telefone" so for this discussion you'll have to use your country's specs. For the USA I read at that it's "20Hz minimum ring voltage supplied is 40Vrms (delivered into a 5 REN load)."

Now that we know this we have to find a way to create such a signal. Again, we as above to find this link.

The second schematic is what we need. Now try connecting your wires from your current bell to that ring inhibit and see if that works for you.

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How to connect an old tel. bell to door bell
by nichosi / September 19, 2012 5:43 AM PDT

Just found how to attach a foto of the old bell.

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And it looks like you need to build the circuit to drive it.
by R. Proffitt Forum moderator / September 19, 2012 5:49 AM PDT

Since most AC or MAINS is 60Hz and these bells need 20Hz (varies on country) then you are looking at a small electronics project.

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How to connect an old tel. bell to door bell
by nichosi / September 19, 2012 6:22 PM PDT

Sorry for the shortcut "....fone", it is here in the old UK BT.

Did you see the attached foto of it?

Could'nt make a word of all that but the duck was fine.

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Saw the foto
by R. Proffitt Forum moderator / September 20, 2012 12:57 AM PDT

And it sounds like a fun project. The links I gave have the necessary details but I can imagine those that don't make their own stuff may feel challenged.

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How to connect an old tel. bell to door bell
by nichosi / September 20, 2012 4:01 AM PDT
In reply to: Saw the foto

OK thanx all, can never manage it, will sell it !!!???

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