For crying out loud, I brought up a subject for discussion and got attacked like a teenager that told her dad she got a tattoo on her face.
I just have to do this:
The circuit shown in Figure 5 is a typical implementation ofa 6 V, 330 mA, constant voltage, constant current (CV/CC)output power supply.
find a tiny, cheap, constant voltage power supply that isn't already stuck inside a wall wart to experiment with.
It's a green thing.