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Subject: Re: Howto: Low current PS without a transformer
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 14 Nov 2002 08:08:06 GMT
NNTP-Posting-Date: Thu, 14 Nov 2002 09:08:06 MET
"Leif H" schrieb im Newsbeitrag
> I need a simple and cheep power supply that I can connect to 220V AC. How
> can I make this without using a large and "expensive" transformer? The
> output voltage is about 3V DC and the current is less than 50mA. Any
> Leif H
The single phase mains tolerances in continental Europe(incl. Norway) are:
Voltage 230 volts AC RMS +10% / - 6%
Mains Frequency 50.00 Hz +/- 0.2 Hz
You are not allowed to connect any appliance galvanically coupled(=without
transformer with separate isolated windings) to mains, which doesn't meet
very rigid specs.
Only certified people(electrician, EE) are allowed to do these kind of
things. Inform yourself about the rules in your country, if you have an
accident the insurance might not pay (for your funeral).
As an hobbyist just stay away from mains, use a ready-made wall wart and do
your low voltage circuits.
to Mr. Woodgate: Do you agree, Sir?
I remember with 14yrs. sticking this brass rod into the soil, connecting (in
those times still) 220V phase to it and collecting the ringworms for
fishing. Luckily there are these Ground Fault Interrupters now preventing
you kids from doing this.
electronic hardware designer
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