Re: Onboard Boost for a Single Coil
You can't boost without a battery. Since you can't add from nothing, you need a battery to add more volts to your signal, always think of batteryless operations as cutting.
So if you want a boost, without a battery, you'll need a high output pickup, then a cut switch. The real trick would be to find a high output single coil pickup that you like the sound of. You'll probably also have to add in a capacitor to retain the high end of the single coil, if one's not built into the knob already.
I believe fender deluxe strats have a volume knob with a button built in under the "volume" label. So maybe you can find that part and a wiring schematic for a place to start?