12V Mains Adaptor help

[eccles]

I just tripped over the power lead to my exercise bike and bent the pin where is connects to the bike which has made flick on and off with any movement. I've just been on ebay and Amazon looking for a replacement power supply but I can't seem to find one with the same specs.

It's the usual 220-240v/ 50Hz input but the output says 12v 35VA. It's the 35va that I'm having trouble matching.... is this just the amps written in a different format, or is it something rare and exotic?

Any help and pointer gratefully received.

[cobra kid]

Just under 3 amps??

[cobra kid]

https://electronics.stackexchange.com/questions/34...

[sgrimshaw]

The 35VA is how much power the transformer can deliver at 12v.

It's simply the amps x voltage, so to work out the amps divide the VA by the V, ie 35/12 = 2.92 amps.

That's the theoretical amps, in reality it'll be less than that.

[eccles]

Brilliant, thank you both for your help.

[Sheepshanks]

If it says VA it may be AC output - does it say whether it's 12V DC or AC?

[eccles]

Sadly no, just says 12v.
It has a symbol below it showing a minus sign in a circle, then a line going to a 'C' shape, then a black dot nestling inside the 'C' with a line then going to a positive symbol inside a circle if that helps. It also has (between the 12v and the 35va a solid line over a dotted line, again don't know te significance of these symbols, but they may be obvious to you electrical types

[Foliage]

eccles said:

Sadly no, just says 12v.
It has a symbol below it showing a minus sign in a circle, then a line going to a 'C' shape, then a black dot nestling inside the 'C' with a line then going to a positive symbol inside a circle if that helps. It also has (between the 12v and the 35va a solid line over a dotted line, again don't know te significance of these symbols, but they may be obvious to you electrical types

DC solidline dotted line

The other symbol you refer to denotes centre positive.


Not sure why its written as VA not watts, perhaps their is a variable power factor...


you could try something like this, https://www.amazon.co.uk/SoulBay-Universal-Switchi...

35VA is 35W its DC so not entirely sure what its getting at.

Edited by Foliage on Friday 9th October 15:39

[Sheepshanks]

Agree.

[JimbobVFR]

The c symbol is indicating which part of the barrel plug is positive and negative. It's not a C but a representation showing the inner pin and outer barrel

The solid and dotted line indicates it's DC, it would be a small dine wave symbol if it was AC.

[eccles]

The bike has variable magnetic resistance, would that account for a need for variable power?

So if I get a 12v 3 amp power supply that should do the trick?

[sgrimshaw]

Have you contacted the maker of the bike?

[Mr Pointy]

eccles said:

The bike has variable magnetic resistance, would that account for a need for variable power?

So if I get a 12v 3 amp power supply that should do the trick?

You don't need a variable supply. Just look for one that is 12v DC that can supply 3 amps or is rated at 36W/VA or higher.
https://www.amazon.co.uk/s?k=12v+DC+Power+Supply&a...

This would probably do the job & has a range of tips so you can fit the right one:
https://www.amazon.co.uk/Supply%EF%BC%8C-Charger-R...

[eccles]

Thanks for all your help, 3amp one ordered.