voltage regulators
What you do with that 7.6V is your own business, E-rain... I was curious, though. 2cd the good vibes on Sebi, always comes back with a thoughtful answer; Mosfet presented some good ideas, too.
I saw the method Sebi mentioned many years ago, and always liked it for simplicity. It uses the quiescient (kwhy or Kwee-es-scent, what the part consumes on it's own) current flowing through the regulators' ground pin to raise the output voltage by a fixed amount. Check the following links, you'll find this circuit with equations near the end.
https://www.electro-tech-online.com/custompdfs/2003/08/LM7805-1.pdf
https://www.electro-tech-online.com/custompdfs/2003/08/LM78L05.pdf
Keep in mind that Iq is loosely spec'd, ~ 2-8 ma. No problem if you only make a few units and hand-select the resistors, but it's not something you would depend on for higher volume production. The regulators you have on hand may have closely matched Iq's (no pun intended), but then they probably come from the same batch. Always use the worse-case specs from the data sheet when making a production design, and then de-rate by another 10%, if the cost is small.
Here's why I asked for the end application. The first thing I'd do is take apart the PSX pad and see if it has it's own 5V regulator. The numbers mentioned (7.6V - 9V) suggest there's one inside. 7.6V is a typical minimum voltage a designer would spec to account for the insertion loss of a 7805 type regulator (~ 2V). It's kind of redundant to regulate the regulator if that's the case (there are situations where you may want to do this, such as spreading heat dissipation around the various physical components. It's inefficient to do so, and you're better off reducing power dissipation in the first place. Ex: using switching regulators for digital logic).
A quick web search didn't turn up the internals for the PSX pad. Sometimes it's a quicker to figure things out on your own. Don't be afraid to take things apart, even if you can't put them back together. Learning's worth more than stuff. Good luck!
- CAL