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17th January 2019, 20:10 #1
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17th January 2019, 20:41 #2
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Re: circuit to mesure ac voltage
So show us the exact "reality" circuit you used.
What AC and DC voltage sources do you have?Zapper
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17th January 2019, 22:25 #3
Re: circuit to mesure ac voltage
Superposition theorem
The superposition theorem for electrical circuits states that for a linear system the response in any branch of a bilateral linear circuit having more than one independent source equals the algebraic sum of the responses caused by each independent source acting alone, where all the other independent sources are replaced by their internal impedances.My batteries are recharged by "Helpful Post" ratings.
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17th January 2019, 23:36 #4
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18th January 2019, 00:41 #5
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Re: circuit to mesure ac voltage
Hi,
Please focus on the "non working curcuit".
It makes no sense to show the "working" circuit, but complaining another circuit.
> photo, exact schematic, exact components and wiring
And please give unambigous informations.
ac =1.5 V
In opposite to this in mathematical discussion one often uses the "amplitude value"
With sine value:
1V RMS = 1.414Vp (peak) = 1.414V ampltude = 2.828Vpp (peaktopeak)
= 1.414V × sin(wt)
Btw: the simplest solution I see is just a capacitor and a resistor:
AC  C  (output)  R  1.5VDC.
But there are several ways, with and without Opamp, with and without capacitor...
You first have to decide your requirements / specifications.
Generally: if the real results differ a lot from the expected results, then  most probably  you are doing something wrong.
KlausPlease don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.

18th January 2019, 05:15 #6
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18th January 2019, 14:38 #7
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Re: circuit to mesure ac voltage
thanks for the informations so if i understood you i must use a capacitor with the ac input
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