I was wondering if there is an easy way to take one of their amplifiers or take the microphone off of the assembly and solder the left or right of a headphone jack in its place.
I know audio is AC while the analog is 0-5 VDC
have the signal come from a phone/laptop and then split it to the arduino and some speakers that are separate.
I'm assuming the 2 resistors and the capacitor are in parallel?
is there anyway to have this adjustable to fine tune for minimal clipping
There is no need this produces exactly symmetrical clipping but if you want you can replace the two resistors with a 20K ( ish ) pot.
No... The resistors are for DC bias and they need to be equal.
You can add a pot (on the "audio side" of the capacitor), but you're probably not going to clip with a headphone signal (or with a line-level signal) so I'd try it first.
So let me get this straight, the resistors after the capacitor adjust the clipping so if it's variable, then it chills get the bias as close to 2.5 volts assuming I adjust it right.
Also, does the capacitor have to be 1uf or can it vary slightly? If so, how much?