I need to convert from 4 to 3.3V. So I was thinking of a diode, or voltage regulator. Voltage regulators, I know that it uses about 5mA to do the job.
How much current a diode uses ? I cant find this information…
[sorry I deleted the former question, was wrong 3.3 not 4.4]
Best Answer
Presumably you are considering using the forward voltage drop, Vf of a silicon diode placed in series with the load to drop about 0.7 V to bring your voltage down.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Using a diode to reduce supply voltage.
This works but you need to be aware of a few things:
A diode doesn't "use" current. It passes current but reduces the voltage. The power dissipated in the diode can be calculated from \$ P = VI = 0.7 \times I \$.