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3 votes

With little electrical knowledge is it possible to get a standard US light socket to power a small 3 W LED?

The safest way to do this project is to use a commerical power supply to provide a DC voltage to run a custom LED. Then, you could create an AC powered version using a commerical light socket for an ...
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0 votes

Why aren't there any 3-phase domestic power-outlets, or any interest in 3-phase for household (mains) power or anything relatively low-power?

Here in Serbia we have 3-phase electricity going to every household, and this stands true for the rest of the Balkans. Having 3-phase electricity allows us to connect different rooms on different ...
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2 votes

Design for 110 V brownout detector

Using DC gets tricky because of the capacitor(s) and the associated time constant. You can transformer the AC down then use an optocoupler (resistor needed for led value dependent on transformer ...
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3 votes

Design for 110 V brownout detector

A really cheap and simple way to determine if there are glitches or brownouts on an AC line would be an AC relay that latches on by means of a NO contact. When the disturbance occurs, the relay will ...
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3 votes

Design for 110 V brownout detector

Easiest (and very safe) approach is to find an old non-switching (linear) wall wart and divide the DC output down to some acceptable voltage for the ADC with a simple voltage divider. The divider ...
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1 vote

Coaxial 75ohm cable parallel to electrical mains 127V AC @ 60Hz

As long as the shielding is good there should be any strong disturbance. Please note that shielding requires more than buying a good shielded coax cable. It is also about properly connecting the ...
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2 votes

Coaxial 75ohm cable parallel to electrical mains 127V AC @ 60Hz

It's probably fine. Digital signals aren't terribly sensitive to interference. Combined foil/braid shielded cable (RG6) would be better than just braid (RG59). Ferrite sleeves, as suggested by Math ...
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0 votes

Best switch type to turn off the mains voltage to electronics

You can't use any switch. The switch must have safety approvals your electrical code requires for mains voltage. In addition, the switch must be rated for local mains voltage with some margin , it ...
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1 vote
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Best switch type to turn off the mains voltage to electronics

So long as the switch is specified for 240V AC use and the contact current rating is greater than that drawn by the plate it shouldn't matter what switch you use. Since you are in the UK make sure it ...
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0 votes
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Does a DC battery have a live terminal?

Everything depends on what you mean by "live" In a domestic electrical system, the term is used to mean something that carries a very different voltage with respect to the ground you are ...
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2 votes

Does a DC battery have a live terminal?

Most cars (all modern cars) use the positive battery terminal as "live" and the negative terminal as "ground." So the negative is kind of like the neutral, and the positive is kind ...
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3 votes

Does a DC battery have a live terminal?

No. The only reason line power has a neutral is because that neutral is connected to the Earth somewhere. And in that case, the difference between the neutral and the earth/ground connection is that ...
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7 votes
Accepted

How is transformer output affected by frequency?

For a given primary excitation voltage, the magnetization current will be twice as much at half the frequency. This is just simply thinking about the primary circuit as an inductor (because that's ...
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