Fucking pt100 sensors and fucking max31865 amplifiers! Waited a few months to arrive (working on an arduino bbq temp monitor and log server), ordered fucking everything, asembled fucking everything and this piece of fucking shit reads random values between -200 AND 980 DEGREE not even constant and sometimes gives under/over voltage. Tried a whole another max and different pt100s but every fucking time this random madness. WHY THE FUCK IT CANT JUST DISPLAY THE FUCKING TEMPERATURE???

[Question]
What type of amplifier circuit would I need to power a 60w 8ohm speaker or can you recommend any prebuilt amplifier boards ?

[TLDR;]
I spotted the below stuff while cleaning out my junk cupboard and thought it might be a fun side project to convert them into a portable bluetooth speaker since the earphones are shit anyway and I've always wanted to learn more about amplifiers.

The only question remaining is how to amplify the headphone output signal enough to power the speaker. I plan on either using cells from old laptop batteries or a motorbike battery as a power supply so input voltage would be roughly 10-12v.

The speaker is from a set I salvaged from an old 80's hifi and has excellent sound quality, would mounting the components inside it have a large negative effect on it's sound?

Also although I would prefer to make my own amplifier board as a learning experience the goal is to have a portable speaker with good sound quality... is this something I'm likely to get from my first attempt at an amplifier or should I rather get a ready made board?