Sound Advice?-SOLVED - Raspberry Pi Forums

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i've decided add speakers portable pi project i'm building, picked pair of speakers magnet 30mm 2800hz 8ohm 1w
small enough fit in enclosure, , know need amp drive them picked pam8403 5v mini digital power amplifier.
since project using composite video grabbed trrs 4 pole jack. figure should easy enough grab l & r channel jack , use input amp, since requires 5v power plan grab pin 2 or 4 off pi's gpio , use either 6 or 9 ground. ok, of easy enough here questions;
a) if add pot between power source , amp act volume control?
b) or amp fail operate @ reduced voltage?

second, since i'm bumping space constraints adding pot volume control might moot point anyway, know there volume control in in gui when run startx, since i'll using custom gui can point me commands/subroutine i'd run under cli change volume ?

help,
jeff

changing supply voltage extremely unusual way of controlling volume , won't work amp blocks, including pam8403.

need control level of signal input amp, pi output goes "top" of fixed element of pot, ground "bottom", while amp fed wiper (ground connected through).

google pam8403 more info -- |i didn't see sample circuit in datasheet, i'm sure there 1 somewhere (there form of volume control built in chip, didn't find how use brief search).

edit: on further inspection, onboard volume control has 2 states. muted or not :(


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