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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 2nd Jun 2010, 6:42 pm   #1
Boom
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Default Shaver sockets?

Are these isolated? I'm trying to find a transformer suitable for use to knock up a 120V supply for a battery set. Need about 15-20mA.

Dave
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Old 2nd Jun 2010, 6:47 pm   #2
Kat Manton
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Default Re: Shaver sockets?

Hi Dave,

Quick answer; yes, as far as I know, they all are.

If they're intended for installation in a bathroom, regulations insist on it.

Cheers, Kat
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Old 2nd Jun 2010, 7:38 pm   #3
Phil G4SPZ
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Default Re: Shaver sockets?

They are also designed to saturate and hence reduce the amount of current available under fault or overload conditions. A quick Google search suggests that they are double-wound isolating transformers rated at 20VA. 20VA at 110 volts equates to 180mA, sufficient for your needs.

They are also not cheap - £20-30 - unless you can find a scrap unit from which to extract the transformer.
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Old 2nd Jun 2010, 8:19 pm   #4
electrogram
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Default Re: Shaver sockets?

I have used these occasionally, removed from units bought at car boot sales for £1-2, they usually run very hot, even with no load, some have a device in series with either primary or secondary windings, presumably a thermistor or similar current limiting device but I havn't tried these ones
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Old 2nd Jun 2010, 9:10 pm   #5
Ed_Dinning
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Default Re: Shaver sockets?

These devices are only intended for intermittant use, on a low duty cycle. So if run at near full load for any length of time will get pretty hot, and may even activate any internal thermal fuses fitted.

Ed
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