I was looking at an ipod battery hack in which a 5V zener diode is used to create 5V for USB-charging devices from a 9V battery.
What I'm wondering, and hoping those with more experience will know, is whether this could be adapted for Takky mods.
Quoting the 'meat' of the article form ipod hackaday;
the zener diode conducts in the reverse direction when its breakdown voltage of 5.1 volts is reached, and the voltage across the diode will be that same 5.1 volts, so it acts to limit our 9 volt supply down to roughly 5 volts, which is what usb powers devices at.
the resistor (100 - 330 ohm) is there to keep the circuit from shorting when the load (your shuffle) is removed. if you use a resistor less than 100 ohms you’ll know it because it will get hot. if you use too large a resistor, you won’t be able to supply enough current to your device.
Could a 3V zener diode be used to supply the 'missing' 3.3V that's currently added to Takkys using an additional power supply or a tough to find (for some) regulator?