I need an MP3 player that runs 24/7. All the ones I have shut down and switch to file transfer mode when you plug in USB. So, I think I need a 1.5V AAA battery eliminator.
All my wall warts use a TL431 as regulator.
If I could find a replacement with 1.2V-ish reference in TO-92 I could just drop it in and change one resistor to get 1.5V.
What's a good cheap, shunt-regulator IC that will go down to 1.5V?
TL431 is 5 for a buck shipped on ebay. Closest thing I can find in 1.2V are SMT devices at $10 each shipped.
Anything cheap available?
Suppose I could use a Darlington transistor and not sweat the tempco.
Designing a supply from scratch is trivial. Problem is packaging it. I'm not that motivated.
Ideas? Thanks, mike