Re: Isolated AC line current sensors

I am using this self powered device.
https://www.amazon.co.uk/dp/B0F5WXPHK2?ref=ppx_yo2ov_dt_b_fed_asin_title
__________________________________________

David C Brown
43 Bings Road
Whaley Bridge
High Peak                           Phone: 01663 733236
Derbyshire                eMail: [email protected]
SK23 7ND          web: www.bings-knowle.co.uk/dcb
<http://www.jb.man.ac.uk/~dcb>



*Sent from my etch-a-sketch*


On Tue, 22 Jul 2025 at 01:05, Harold Hallikainen <[email protected]>
wrote:

> I've been asked about sensing current on the AC line. Current transformers
> immediately come to mind. Also, I see there are Hall effect based sensors
> (similar to current transformers, but using a Hall effect device instead
> of a secondary winding). For isolation, I also see linear optocouplers,
> that have two photosensors so the LED current can be servoed. Another
> method would be a current sense resistor with an isolation amplifier.
>
> I remember years ago an LTC RMS to DC converter that measured the
> temperature of a heater. It SEEMS like there could be a chip equivalent of
> a thermocouple ammeter with an electrically isolated heater and a
> temperature sensor.
>
> Other ideas?
>
> Thanks!
>
> Harold
>
>
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