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LTC1967 RMS-DC Converter transformer issue

rjenkinsgb

Well-Known Member
Most Helpful Member
What voltage range from what source?

If it's from AC mains, you need a transformer for safety isolation, if anything else at all will be connected to the circuit.
 

aomepsan

New Member
Unfortunately AC mains and dimmed 10-60VAC. If we push isolation into the background, isn't there other way to do that?
 

rjenkinsgb

Well-Known Member
Most Helpful Member
If it's connected to other things, it must have isolation. If it's going to be a self-contained and fully insulated instrument, get it working using a low voltage AC source to start with then change the input scaling resistors to suit the final voltage range.

Isolation without a mains transformer can be done using isolation anps and a miniature DC-DC converter to run them.
eg

And something like this to power the input stage:

There is an article here which includes measuring AC powerline voltages with ICs such as that:
 

aomepsan

New Member
If it's connected to other things, it must have isolation. If it's going to be a self-contained and fully insulated instrument, get it working using a low voltage AC source to start with then change the input scaling resistors to suit the final voltage range.

Isolation without a mains transformer can be done using isolation anps and a miniature DC-DC converter to run them.
eg

And something like this to power the input stage:

There is an article here which includes measuring AC powerline voltages with ICs such as that:
Do you have any example circuit about it? Because mine is doesn't work.
By the way, the article PDF is high level. I don't know which circuit to use
 

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