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Transformerless 5 Volt Power Supply

 
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Nov 23, 2007 11:36 pm    Post subject: Transformerless 5 Volt Power Supply Reply with quote




http://www.electronics-lab.com/blog/?p=510
http://www.josepino.com/circuits/index?transformerless_power_supply.jpc

"Simple, low cost and easy to build power supply. Ideal for applications that doesn’t require too much power. It can provide power to circuit that uses less than 100mA without any problem. The disadvantage of this circuit is the danger of an electrical shock, so it cannot be used if the circuit is in contact with the user. The voltage supplied by this is determined by the zener diode."
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ginbot86
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Joined: 02 Aug 2008
Posts: 47
Location: Canada

PostPosted: Wed Aug 13, 2008 9:31 pm    Post subject: Reply with quote

Wow. So, you'll get shocked if you're in contact with the low voltage side of the circuit?
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Jason the elite
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Alan
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Joined: 29 Jan 2006
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Location: Winnipeg, MB

PostPosted: Wed Aug 13, 2008 11:07 pm    Post subject: Reply with quote

ginbot86 wrote:
Wow. So, you'll get shocked if you're in contact with the low voltage side of the circuit?


You are correct. Cool These should only be used when there is no chance of anyone coming contact with the output. It is very cheap to go this way since the transformer is usually a big expense of the power supply.
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ginbot86
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PostPosted: Thu Aug 14, 2008 12:17 pm    Post subject: Reply with quote

So, the equipment connected mustn't touch ground then?
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Alan
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PostPosted: Thu Aug 14, 2008 10:36 pm    Post subject: Reply with quote

ginbot86 wrote:
So, the equipment connected mustn't touch ground then?


That's right.
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electron
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Joined: 30 Mar 2009
Posts: 8
Location: UK

PostPosted: Wed Apr 01, 2009 12:40 am    Post subject: Reply with quote

Alan wrote:
ginbot86 wrote:
So, the equipment connected mustn't touch ground then?


That's right.

Ah well, I remember the days when all the electronic shops were flooded with mains transformers for high voltage secondrys. But there are plenty of stepdown transformers on the market now.
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Alexander125
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Joined: 13 Jan 2009
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Location: Galati, Romania

PostPosted: Wed Apr 01, 2009 11:27 am    Post subject: Reply with quote

i didn't see the transformer, so if you put a 110 volt zener u get killed.
nice
a stepdown transformer costs under 2 or 3 bucks for 500 miliamps.
better not take the chance.
i stick to transformers
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Wed Apr 01, 2009 1:19 pm    Post subject: Reply with quote

Alexander125 wrote:
i didn't see the transformer, so if you put a 110 volt zener u get killed.
nice
a stepdown transformer costs under 2 or 3 bucks for 500 miliamps.
better not take the chance.
i stick to transformers


This would make a great solution for a project that needs to connect directly to AC power and need to be very small. It would need to be in a sealed case so that no one could ever come in contact with it.
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Alexander125
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PostPosted: Fri Apr 03, 2009 12:06 pm    Post subject: Reply with quote

yes, you are wright, but I dont really want to go that way.
Simply buy a transformer, a diode rectifier bridge and you're set.
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tbyte
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Joined: 13 Jul 2009
Posts: 2

PostPosted: Mon Jul 13, 2009 10:31 pm    Post subject: Reply with quote

You can find plenty of 5v supplies for 3 bucks or so commercially. They are used for recharging MP3 players, phones, and other devices that have USB connections.
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