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Old 4th Oct 2019, 2:08 pm   #1
Mikeybean
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Location: Leeds, West Yorkshire, UK.
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Default Vintage Electromagnetic doorbell wiring

Hello there, I come to seek advice from vintage electrically minded people.

I have been tasked with wiring a vintage IBEX doorbell up in our house and cant seem to get it to work.

Before I go on here is some useful information:

  • I am unsure what voltage the doorbell actually is.
    I have it wired up to a Axiom 8v transformer currently.
    Contacts 2 and 3 were bridged when we bought it.
    Each electromagnet works individually (pass current through each individually and it draws the contact attached to the arm.
    Our electrician is at a loss as to how to get it to work.
    Tried every combination of wires on contacts, just doesnt alternate between the electromagnets as expected.


Would really appreciate it anyone had any ideas as to what to do?

Kind regards, Mike
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Old 4th Oct 2019, 2:11 pm   #2
Station X
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Default Re: Vintage Electromagnet doorbell wiring

Sorry, but that's not a door bell. It's a telephone extension bell designed to operate from a 25 Hz AC supply. It cannot easily be used as a doorbell.
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Old 4th Oct 2019, 2:29 pm   #3
donutty
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Default Re: Vintage Electromagnetic doorbell wiring

Yes, I thought immediately those terminals look very GPO...
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Old 4th Oct 2019, 3:20 pm   #4
AC/HL
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Default Re: Vintage Electromagnetic doorbell wiring

It can be done if you're really set on using this bell: https://www.vintage-radio.net/forum/...410#post407410
Much easier to locate a suitably vintage doorbell or chime though.
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Old 4th Oct 2019, 4:35 pm   #5
TonyDuell
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Default Re: Vintage Electromagnetic doorbell wiring

Most telephone bells will ring if you power them from a 30V mains transformer (so 50Hz) with an 8uF (or 10uF) non-polarised capacitor in series. You may want to adjust the armature travel (loosen the screw(s) and move the magnet to set the gap between the armature and the coil core it is not against if you see what I mean) and the gong position (the fixing holes are deliberately off-centre so rotating the gong does that).

BUT...

I'll do things like that on my bench for testing and experiments. I am not sure I'd want such a system set up and left powered all the time.
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Old 4th Oct 2019, 9:36 pm   #6
rambo1152
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Default Re: Vintage Electromagnetic doorbell wiring

A carbon-copy misunderstanding was discussed here one year ago.
https://www.vintage-radio.net/forum/...d.php?t=150416
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