DIYbanter - View Single Post - Logging mains voltage: Arduino or Raspberry Pi?

The Natural Philosopher[_2_]

On 14/04/18 13:44, wrote:
On Friday, 13 April 2018 20:45:16 UTC+1, Cursitor Doom wrote:
On Fri, 13 Apr 2018 07:38:11 -0700, whisky-dave wrote:

Problem is dealing with mains AC voltages and having to reduce them
first.

Not really. Loads of suitable sub-min mains transformers in every local
recycling site; help yourself for free. Or just a couple of quid new from
China through Ebay.

Most small mains transformers are run very close to core saturation, so
any large transients are likely to be clamped by the transformer.

Oh dear. A pseudo authoritative statement from someone who doesnt know
the difference between voltage and current.

This
could be overcome by putting a resistor in series with the transformer
primary so that it is running at a small fraction of mains voltage.
Have a load resistor on the secondary may improve the performance as well.

Oh dear. Soemone who doesnt understand inductance either.

John

--
In todays liberal progressive conflict-free education system, everyone
gets full Marx.