Makeshift (Digital) Potentiometer? Is It Possible?

i'm asking because don't have enough time wait digi pot in mail, , because love electronics challenge....

is possible build digital potentiometer scratch? circuit can control resistance of arduino\mcu...

i thought maybe pwm controlled.... i'm doing research speak , coming empty.

so possible?

how many "taps" want have?
you make r2r ladder , use analog switches, or small relays, pick off connection point.

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