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Wow, thank you very much for your insights! (and [USER=604253]@danadakk[/USER] for the simulation).

The final circuit is a battery (64V) voltage measurement:

[ATTACH=full]198507[/ATTACH]

The components values are not accurate though, it's just a proof of concept.

I actually need a reference voltage of about 40V and I could set up a current source value of 5 mA or smth.

I just wanted to get a broader range for the battery voltage output signal (toward the uC ADC).

PS: Sorry for the delay, my postings are moderated.

[QUOTE="riscv, post: 1790814, member: 695355"] Wow, thank you very much for your insights! (and [USER=604253]@danadakk[/USER] for the simulation). The final circuit is a battery (64V) voltage measurement: [ATTACH type="full" alt="ref_volt_v2.gif"]198507[/ATTACH] The components values are not accurate though, it's just a proof of concept. I actually need a reference voltage of about 40V and I could set up a current source value of 5 mA or smth. I just wanted to get a broader range for the battery voltage output signal (toward the uC ADC). PS: Sorry for the delay, my postings are moderated. [/QUOTE]

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