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PostPosted: Sat Jan 06, 2018 3:10 pm 
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So we bought this lovely looking doorbell from a boot sale.

It is powered by 6v battery pack.

I managed to get it to work (most of the wires were missing) by trial and error but it now doesn't work at all.

If I apply battery power direct to the motor, the bell swings but pretty fast so I assume that the gubbins shown in the second photo (which sits between the battery and motor)slows down the voltage enough so that the doorbell swings at a suitable speed.

If you look at the small black component there is some writing on it (w 02 f) a plus and minus symbol and two wavy symbols. It has four wires (I broke one off).

So can I buy this component or is there another way of safely powering the motor so that it doesn't spin quite so fast?! I've tried to google the component but no joy, was hoping maplins might have one.

Kindest regards and happy new year!

Clarke


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PostPosted: Sat Jan 06, 2018 3:42 pm 
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The round black thing is a full wave rectifier.
Wavy lines AC in
+ and - DC out.
A bit of a Google found the spec for a WO2F
http://www.icpdf.com/icpdf_datasheet_7_ ... f_1642397/
It'd have been connected via a transformer originally to give probably 6Volts on the secondary. (The side of the transformer connected to the rectifier and bell)
Obviously don't connect any of this to mains voltage.
If you're running it off batteries you don't need the rectifier. Just the battery pack connected to the motor, with the bell push in series.
Try running it on 4.5 volts if possible to slow it down.

The bell itself looks like something someone made themselves a while back.



For this message the author Dave54 has received gratitude : clarke
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PostPosted: Sat Jan 06, 2018 4:32 pm 
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Thanks Dave! It runs off 4 1.5v batteries so would be fairly easy for me to step down voltage. Wasn't sure if I could connect straight to motor without some sort of resistor so am glad to hear that the solution is so straightforward!
Is it ok to replace any batteries that I take out the holder with a piece of wire bridging the gap?


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PostPosted: Sat Jan 06, 2018 4:40 pm 
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Yes you can bridge out one battery position in the holder. As you say it'll then give 4.5V as long as they are in series.
You say there's a motor in there.
Is it literally a motor?
Is there a voltage marked on it?
There is sometimes.


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PostPosted: Sat Jan 06, 2018 5:29 pm 
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Dave54 wrote:
The bell itself looks like something someone made themselves a while back.


Believe it or not, that is not correct, they are known as "Butlers doorbells" You can still buy them. (Ready made)

Image

Other suppliers of doorbells are available.

----------------------------------------------------------------------------------------------------------------------------

For what its worth a rectifier changes A.C. (Alternating current) to D.C. (Direct current) the one shown is just 4 diodes in a small package. But the diodes themselves will cause a voltage drop, hence you need less batteries.

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PostPosted: Sat Jan 06, 2018 5:43 pm 
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someone-else wrote:
Dave54 wrote:
The bell itself looks like something someone made themselves a while back.


Believe it or not, that is not correct, they are known as "Butlers doorbells" You can still buy them. (Ready made)

Image

Other suppliers of doorbells are available.

----------------------------------------------------------------------------------------------------------------------------

For what its worth a rectifier changes A.C. (Alternating current) to D.C. (Direct current) the one shown is just 4 diodes in a small package. But the diodes themselves will cause a voltage drop, hence you need less batteries.


Never seen those. Although I've worked in a couple of houses that still had part of the old "pull" mechanical bell systems.
We live and learn!

As you say about the rectifier / diodes.
Being a simple bloke I'd just take a battery out. :mrgreen:


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PostPosted: Sat Jan 06, 2018 6:38 pm 
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Funny you should say that, I know a house that still has a working one, but that said I have no idea how old it is, since you can still buy them too, from..........................Screwfix of all places

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PostPosted: Sat Jan 06, 2018 6:46 pm 
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I didn't realise you could still get them!
Do they stock servants to go with them as well? :mrgreen:
The ones that go all over the house from multiple pulls to call servants had "relay arms" to change the direction of pull.
The one place I worked in was a fairly big old house that had been a rather grand farmhouse. It had a huge drawing room that was built in the 18th Century, and looked like it was from a grand house. Anyway the roof space was full of these relay things. The bells didn't work of course.


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PostPosted: Sat Jan 06, 2018 7:05 pm 
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If this is a doorbell could you ask your callers to stand outside and shout "Ding dong"... :hiding:

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PostPosted: Sat Jan 06, 2018 7:29 pm 
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wine~o wrote:
If this is a doorbell could you ask your callers to stand outside and shout "Ding dong"... :hiding:



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PostPosted: Sat Jan 06, 2018 7:52 pm 
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Dave54 wrote:
The ones that go all over the house from multiple pulls to call servants had "relay arms" to change the direction of pull.



You can get those too.

Image
(Although to be fair, this is the first one inside the house)

I can't remember where it is, but I have been to a house that had the ""electric version" and in the kitchen was an "Indicator box" with "flags" to indicate which room the servants were required in.

The ones I have seen had "cable" to operate the bell, seems they are now using "string"

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Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

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PostPosted: Sat Jan 06, 2018 8:09 pm 
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One of the exercises we did as apprentices was to wire up door bells in various configurations.
One of the exercise used an indicator box like you say. They were all run off those glass lead acid batteries!
It is nearly 50 years ago though.
The mechanical relays I've seen had two arms joined together and a spring IIRC. The arms were slightly different lengths to give some mechanical advantage one way or the other. The wires were all broken up in the ones I've seen.
It was the weirdest place as well. Over the older part of the house (very old!) and you climbed down into it through a hatch, accessed through the old servant's quarters.
I'm not particularly "windy" about buildings, but this one definitely had some sort of "feeling" about it. :shock:


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