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Hello everyone,
I have a question related to an AC/DC circuit and a microcontroller. The idea is that my PIC microcontroller can detect when the input voltage exceeds 90V. So, I'm thinking of using a bridge rectifier to convert AC to DC, then a voltage divider to step down the voltage, and finally, a comparator (like the LM393) to compare it with a reference voltage.

Has anyone here had experience with this kind of circuit? Could you give me some advice? Thank you all for reading!
Additional Notes (if needed for clarity):
Bridge rectifier (GBU406)→ Converts AC to pulsating DC.
Voltage divider → Reduces high voltage to a safe level for the microcontroller.
Comparator (LM393) → Compares the scaled-down voltage to a reference (e.g., 2.5V) to trigger the PIC when input > 90V.
Can u guys give me somes suggestions for component values (e.g., resistor ratios) or circuit protection (like a Zener diode) if thats in case?

<blockquote data-quote="tony abs" data-source="post: 1790819" data-attributes="member: 695443">Hello everyone,I have a question related to an AC/DC circuit and a microcontroller. The idea is that my PIC microcontroller can detect when the input voltage exceeds 90V. So, I&#039;m thinking of using a bridge rectifier to convert AC to DC, then a voltage divider to step down the voltage, and finally, a comparator (like the LM393) to compare it with a reference voltage.Has anyone here had experience with this kind of circuit? Could you give me some advice? Thank you all for reading!Additional Notes (if needed for clarity):<ul>
<li data-xf-list-type="ul">Bridge rectifier (GBU406)→ Converts AC to pulsating DC.</li>
<li data-xf-list-type="ul">Voltage divider → Reduces high voltage to a safe level for the microcontroller.</li>
<li data-xf-list-type="ul">Comparator (LM393) → Compares the scaled-down voltage to a reference (e.g., 2.5V) to trigger the PIC when input &gt; 90V.</li>
</ul>Can u guys give me somes suggestions for component values (e.g., resistor ratios) or circuit protection (like a Zener diode) if thats in case?</blockquote>

[QUOTE="tony abs, post: 1790819, member: 695443"] [B]Hello everyone,[/B] I have a question related to an AC/DC circuit and a microcontroller. The idea is that my PIC microcontroller can detect when the input voltage exceeds 90V. So, I'm thinking of using a [B]bridge rectifier[/B] to convert AC to DC, then a [B]voltage divider[/B] to step down the voltage, and finally, a [B]comparator[/B] (like the LM393) to compare it with a reference voltage. [B]Has anyone here had experience with this kind of circuit? Could you give me some advice? Thank you all for reading! Additional Notes (if needed for clarity):[/B] [LIST] [*][B]Bridge rectifier[/B] (GBU406)→ Converts AC to pulsating DC. [*][B]Voltage divider[/B] → Reduces high voltage to a safe level for the microcontroller. [*][B]Comparator (LM393)[/B] → Compares the scaled-down voltage to a reference (e.g., 2.5V) to trigger the PIC when input > 90V. [/LIST] Can u guys give me somes suggestions for component values (e.g., resistor ratios) or circuit protection (like a Zener diode) if thats in case? [/QUOTE]

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