How much voltage are you reading ? Large value or a small ripple ?the AC voltage should be rectified and no AC components must be there, how come I still read an AC voltage on its output? Could it be that there are harmonics on the output, and the voltmeter reads them, contrarily to a DC motor that takes the average value of the rectified output?
This all means that the bridge is working fine, but there exists some sort of harmonics?
If you take 1.5 V dry cell and attempt measuring voltage using multimeter on AC range, it will show more than 1.5 V AC.
If it is so then:
What you are measuring is not real pure AC.
To be able to measure the AC component in the DC output you will have to include a capacitor in series with the multimeter with multimeter in the AC range.
Even then the AC component at the filtered output will depend on the load connected as pointed out by FvM.
The value of capacitor will also matter if the reactance / impedance becomes comparable to the internal resistance of the multimeter used.
As for betwixt, i tried to connect non polarized capacitor in series with one of the two probes of the multimeter, from 10nF to 1uF the result was that i wasnt able to neither see DC nor AC voltage for a silver battery cell that has 7,5V.
You have ripple because the value of your 100uF filter capacitor is too low for the amount of current you are drawing in the load.
Increase the value of the filter capacitor to 1000uF, then 4700uF then 10000uF to see the ripple almost vanish.
I think your multimeter is garbage. Mine does not measure AC from a battery.
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