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The Arduino can produce PWM (pulse width modulation) signal with a voltage from 0V to 5V of 2.5V direct current offset.
However, I am working on audio amplification and wanted to remove the offset and to fit the zero offset PWM signal to an op amp.
The idea of using one resistor and one capacitor comes to mind. I tried several resistance and capacitance and found out that having a very high resistance and a very high capacitance will help to produce a higher zero offset analog signal output (AC in the schematic).
Below is the schematic:
Resistor and capacitor zero DC offset output analog voltage
Hope you enjoy this article.
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