At 300 ma a couple of 1 amp diodes will give you approximately the right voltage drop.
1N4001, common as dirt, you can probably find some old or broken electronic device in your home with some in it.
At 300 ma a couple of 1 amp diodes will give you approximately the right voltage drop.
For your 300 ma load at 1.5 volts, your load resistance is 5 ohms. To drop your 3 volt supply to 1.5 volts at the load, you need a 5 ohm, minimum 1/2 watt resistor. This assumes (I know) that your power supply will maintain 3 volts at 300 ma. Be aware that if your load doesn't draw 300 ma all the time, the voltage across it will vary.
Part no. 242114 | |
---|---|
Manufacturer | MAJOR BRANDS |
Manufacturer no. | LM1117T-3.3/LD1117V33 |