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PostPosted: Wed Jun 13, 2018 2:28 pm 
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Hello

I need to run a single unit at 12v DC.

So I need to step down from 240v AC to an AC voltage which I can then convert to DC and run the unit drawing 80W maximum at 12v DC.

I do not know if there is any off-the-shelf component available or I have to build a circuit.

Many thanks for any advice. :thumbright:


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PostPosted: Wed Jun 13, 2018 5:20 pm 
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There are units to work a caravan without a battery, also to work LED lighting, what you need to know is exact voltage, 12 volt or 13.8, and also how smooth, the LED power supplies are not very smooth but are cheap.


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PostPosted: Wed Jun 13, 2018 5:38 pm 
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Just look on ebay for a 240-12v power supply putting out at least 7amps. Not too hard to find.


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PostPosted: Wed Jun 13, 2018 5:43 pm 
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ac-dc 12v supply 80W (6-7 amps)

open board or cased ? meanwell are decent quality for the money

https://uk.rs-online.com/web/p/embedded ... s/1065844/


edit. there is a lot of junk on ebay, old designs with a things like short circuit and other protection missing, add next to no filtering and they have a ripple like a force 10 gale at sea


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PostPosted: Thu Jun 14, 2018 1:10 am 
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Be it pulse width modulated, or switch mode power supply, the load can be very important, when they first hit the market place we could not use them for transceivers, we can today, but the massive load switching on/off with CW or side band was too much, often we used a battery to smooth the supply, and most power supplies were not switch mode.

So today you can buy a 12 volt power supply with a price tag anywhere between £25 and £200 it all depends what you are powering.


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PostPosted: Thu Jun 14, 2018 7:42 am 
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I bought a 6amp supply to use on a 12v coolbox for about £5 online, it's similar to a laptop power supply works great.


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PostPosted: Thu Jun 14, 2018 8:10 am 
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Thank you all.

The unit will be used to power a 12v 80W lamp, producing about 6/7 Amps. So, if anyone can be more specific it would be helpful. As suggested I will try Ebay. :thumbright:


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PostPosted: Fri Jun 15, 2018 10:54 am 
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Then any power supply will do, look at LED drivers reasonable cheap and small.


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