Sure thing.
The extras that I am doing are for ones who feel a little more "gutsy" and have a bit of soldering & electronics skill under your belt. This is for my Lynx 2 since I only own this model.
Now for my disclaimer...umm yeah.
I DO NOT recommend this to any electronics novice. Be warned you could severely damage your Lynx if you don't know what you are doing.
I had to get that off my chest. Ok now to the fun stuff.
I am an engineer and deal with electronics on a daily basis so I took this project on as an extra challenge.
For the speaker, I purchased on eBay from China. It is a 2W 8ohm mylar speaker. It has a little more cone excursion than the Atari OEM speaker.
Here is the link
https://www.ebay.com/itm/2W-8-Ohm-40mm-Dia-Metal-Housing-Internal-Magnet-Speaker-Loudspeaker-4Pcs/321872671173?epid=1141773395&hash=item4af11b31c5:g:PeAAAOSwZtlaRTya
For the amplifier, I decided against the 3W mono amplifier since my Lynx 2 has 2 LM386 IC's, instead, I ordered, also from China, a micro mini class D stereo amplifier. I will use this in place of the old amplifier.
https://www.ebay.com/itm/Differential-Amplifier-Board-10W-10W-Class-D-Stereo-Audio-Amplifier-AMP-Module/201448801171?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
Just to satisfy any nit-pickers, yes I am aware the amp says 10W, however that is absolute maximum if powered at 9V and running on a 4ohm load. I don't really have much to worry since I am using an 8ohm speaker and I don't plan on blasting my ears out while playing ElectroCop.
To power the amplifier I will use the same voltage that is supplied for the 2 LM386 chips. I also chose this amplifier because it has better characteristics over the PAM8403, It can run on more than 5V, also is a differential amplifier which will give me the ability to further increase the gain or use the negative feedback to produce a bass-boost circuit. Wiring this new amplifier will also require some rewiring on the headphone jack since the speaker output is BTL, not single ended. Yeah this is where the fun for some might end because this part will challenge you if you want a working stereo headphone output.
The speaker should not need any unnecessary modification for it to fit. You should just be able to pull out the old speaker and snap in the new 2W mylar speaker in its place.
The amplifier mounting is as simple as using Scotch Foam Mounting Double-Sided Tape or equivalent and finding a spare blank area to mount it.
I won't get into the specifics on how it all connects as it does require some technical and electronics know-how. Also, I have not received the parts from China yet as they will take some time.
Of course another way one could go about the amplification upgrade would be replacing both LM386 IC's with a stereo op-amp and piping the output to the headphone jack, This should be wired in a way that the audio on headphones comes directly from the op-amp, once headphone is unplugged, both channels of audio from the opamp are feeding the input of a 3W mono amplifier that is connected to the speaker. Both methods of the audio upgrade just as complicated. My way just requires less parts, less thinking, trial and error, and "tearing up". Lol
For the Lynx voltage regulator repair kit, I ordered from Console5.com
https://console5.com/store/atari-lynx-1-2-voltage-regulator-rebuild-refresh-kit-with-power-jack.html