240v to 12v Transformer

I purchased this from Ebay


And it doesnt have any wiring information. Does anyone have any specs or wiring info on it?

http://cgi.ebay.co.uk/ws/eBayISAPI.d...8380&rd=1&rd=1

Thanks in advance

It's a 230/12 volt double wound encaspulated transformer rated at 3VA. Looks like the ones Eliwell sell. It'll run two Eliwell type controllers together. Thousands of these transformers are made in Italy and labelled with Eliwell, Dixell or any company name if enough are bought!

Sorry, you want to know the connection details. I was rabbitting on about everything else but that information!
With the green terminals at the bottom, the left hand terminals are for 230V and the right hand termimnals are for 12 V.

I'd say the more separated terminals are 230V.

Does it mater what way round the live and neutral go in the 240v side and the live and common in the 12v side, as i have seen many transformers blow if they are not connected correctly.

No, it doesn't matter, unless specified on the cover or terminals.

Sounds good to me, if that transformer is the same that I use which I think it is, I agree with the guys above.
The terminal strip with 3 is mains and the strip with 2 is little volts. Mains you can connect anyway you like, 12 volts, I usually hook the mains up and stick me probes into 12v sockets to see what terminals what, but I dont think it really matters. If I remember correctly the out put is only ac volts, if you want dc find a little bridge rectifier.

The safest way to test it if you are not sure is to connect 12v AC to it and measure the output on the other side. If you read 240v then you have it hooked up correctly. If you measure a very small voltage then its hooked up wrong.

At least this way you do not damage the wingings.

would that really work frank????

Yes it would work. If you got two and joined the 12v windings together it would got from 240v to 12v and then from 12v back to 240v. Knew a sparky who claimed to have done this with a 110v site tranformer so he could run a radio:rolleyes:

I made a little box when I was still at school that had a 240-9v transformer in it.

I popped a 9v battery inside with an on/off push switch and had 2 nails poking out the top.

Great fun to play tricks on with your mates.

(English teacher caught me and made me take it to bits)

Chillin:) :)

Quote:

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Originally Posted by thebigcheese

would that really work frank????

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Why not, that's the basic of a transformer.
All the old Eliwell controllers were 12 VDC/12VAC.
I don't have any spares in my van for 12VAC any longer, just the new 220 VAC ID range with an in-build transformer.
So, if you want to replace a 12VDC with a 220 VAC, just hook one of these 3VA transformers between the 12VAC line and your new 220VAC one.

you cant see it from the pic but i guess the 3 term is the mains[ with a dummy earth] also there normaly stamped on top ,visable on the real thing 240 - 12v over here anyway, if in doubt dont buy of "fleabay", there cheap as chips from the wholsaler anyways.

Thanks for all the advice. Got it working easy as with all your help :D

The 12v would have to be AC though, putting it on a battery would not work... ha ha i like the little shocking device, when switched on it gives a lovely little 240v pulse :-).

The old Eliwells accepted both voltages: 12VAC and 12VDC.
Never saw an application on 12VDC, the transformed 12VAC was connected direct to the Eliwell.
They rectified it inside and then let the voltage drop via a fixed voltage drop regulator.

Indeed, you can't transform a DC voltage via a transformer.
To transform a DC to a higher voltage, you need a lot of electronics to accomplish this.

the left side is 220v and the right is 12v.
you can change in the 220v side, the neutral with the fase.
if you really wan't to be shure about the 220v side, get a ohmmeter(ohms) and get the resistence of both sides. The coil(side) with greater value is 220v, and the lesser value 12v.