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Electrical Safety |
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| message from peter on 19 May 2004 |
I have just bought an electrical keyboard synthersiser online, but the AC
Adapter takes a 120Volt input. I am just wondering whether the following
arrangement would be safe or not?
Mains Socket Supply-> 240V-to-120V transformer->120V-to-12V Adapter for the
keyboard->Electrical Keyboard synthersiser
Also, is it safe to plug the 120V input AC Adapter directly into the 120V
socket of the "Shavers Transformer" which was marked "Shavers Only"? Why is
it that "Shavers point" are for shavers only?
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| BigWallop replied to peter on 19 May 2004 |
As others have said, why not just buy a 240 volts AC transformer that gives an output
of 12 Volts DC or AC whatever the keyboard takes ? The 120 V is for the US market and
the UK market uses 240 V. Your keyboard should take either as long as the output from
the transformer is supplied at 12 V with the appropriate ampage, or slightly higher.
The most important part of the 12 V supply output is the ampage rating from the
transformer. Without the correct ampage the keyboard won't work properly because it
draws a certain amount of load current from the supply (ampage) so check that any
transformer you buy can supply that ampage or slightly more.
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| Dave Plowman replied to peter on 19 May 2004 |
They should really change this given electric toothbrushes etc.
You'd also need to be certain the transformer in the shaver socket is up
to supplying the required current, but I'd guess it would.
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| Derek replied to Dave Plowman on 19 May 2004 |
Maybe I'm missing something here, nobody seemed to think that it would be
odd that he would be plugging an electrical synthesiser into a shaving
socket in the bathroom? If the cable was long enough he could sit on the
bog and play a tune - or sing in the shower with accompaniment! You would
have to limit your audiences and the size of your band! :-)
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| N. Thornton replied to Dave Plowman on 19 May 2004 |
2 more points to consider: is the present PSU regulated or
unregulated? If its reg, you'll need the replacement to be reg as
well.
If you use the shaver socket option, is the socket rated for 20VA
continuous? I wouldnt be surprised if it were rated 20VA intermittent,
and fried when run 20VA continuous.
Regards, NT
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| Lurch replied to peter on 19 May 2004 |
Does it just take a 120v input or will it take a wider range of
voltages. Some PSUs accept 120-250v ish.
Yep, that'd work, all in a suitable box of course.
Yes, it'll work in the socket. The "shavers only" refers to the fact
that it is a double insulated transformer that has no earth
connection, it is also only a low powered transformer, typically about
20VA.
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| Al Reynolds replied to peter on 19 May 2004 |
Just go and buy a cheap 240V to 12V transformer
of the appropriate rating and with an appropriate plug.
Al
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| troubleinstore replied to peter on 19 May 2004 |
Why not buy a 240V to 12V adaptor for the keyboard...?
What is the Keyboard and 12 adaptor is it...?
I have a spare 240V - 12V 850mA adaptor for a Yamaha. It has a +
center pin. the plug on the end has a ring on the outside and a small
pin in the middle.
If it is of use to you, go to my website and send me a message via the
contact button with your name and address details. It won't cost you a
penny.
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Archived message: Electrical Safety (UK D-I-Y House Improvement)
