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Mail Archives: geda-user/2012/03/16/12:26:46

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Date: Fri, 16 Mar 2012 12:26:15 -0400
Message-ID: <CAOuGh8-AgMBZhyYAFDeTjFDNep+yu=H9mUP3mZO0jqfQ8bz_Uw@mail.gmail.com>
Subject: Re: [geda-user] Daughter's Science Fair
From: Bob Paddock <graceindustries AT gmail DOT com>
To: geda-user AT delorie DOT com
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On Fri, Mar 16, 2012 at 11:33 AM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:
> So if I use a 1 watt 15k ohm resistor in series with the nail and an ac
> outlet that will give me 8ma alternating current and that should light the
> bulb?

With no isolation transformer this is not a safe approach for
something in a Science Fair.
Anything connected to the AC Line always presents a electrocution
hazard when not isolated.
Currents of less than 8 mA across the heart could kill.

Two identical transformers hooked up back-to-back will get you safety isolation.

For example in the past 110 in 6.3V out transformers were common.
Hooking the two 6.3V sides together would get you isolated 110VAC out.

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