Hi there, great idea in replacing the dodgy reg!
I recently dug out of lynx and found my batteries had leaked in the compartment, whenever i put the thing away 20+ years ago i guess i didn't think about batteries leaking as a ten year old.
So I did some digging and found this thread, and this forum, hoorah! There is still love for the Lynx. I can't find the charger, so this got me thinking.
Okay, i'm now wondering about updating the thing, i found McWill's LCD, and the flash cart that's in testing, and this got me thinking. So how much in total would a Lynx 2, with a new lcd, and flashcart(sd) pull, probably, 600mA? What do you reckon?
So I'm thinking of replacing the horrid idea of AA batteries with lipo's, either several in series or one larger one and then using a usb charger to charge them and supply enough voltage to the Lynx to power it whilst it's on charge. So this way you could sit on a flight with the usb plugged in charging and playing away.
I've had a look at the schematics that i've found here http://www.retroisle.com/atari/lynx/Technical/Hardware/Lynx-Schematics.php and can't see that the 9v is used anywhere, it's simply stepped down to the 5v.
It's been over ten years since i've touched or looked at schematics and my mind is fairly sketchy. So I'm thinking on installing one of these http://core-electronics.com.au/usb-liion-lipoly-charger-v1-2.html and then output to a 5v step-up Pololu reg or one akin to the one you used. I found your thread when best working out where i would plug the thing in.
What do you reckon, would it cause any hassal to the Lynx overall would you have thought? I don't like the idea of hacking up the Lynx but may knock up something to make it sit in the battery box with a 3d printer. Think anyone else would be interested in using it?