hear hear.stick to galvanic isolation or better -
On MF/SW broadcast sites for this we used optically coupled sensors.
The mains supply is simply intensity modulating an opto isolator ( a
pair actually for both sides of the waveform) .. They can with stand a
fair degree of overload and its likely something else will flashover
first with slots in the PCB. The opto was used in a linear mode. lots
of effective R in the emitter . didnt bother with saturation prevention
diode B-C because the recovery was (still) fast compared to the 50/60Hz.
-glen.
On 23/01/2022 6:15 am, willl will wrote:
On 1/21/22 7:00 PM, Robert LaJeunesse wrote:
Stick with the transformer. The use of a capacitive divider is predicated
on the line waveform always being a sine wave. Dream on! All it takes is
one good spike down the line, maybe only 20-30V amplitude, and your
capacitive divider passes it right on to that ADC that has a much lower
(3.3V?) limit. Guess what goes poof?
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