I am looking for a way to power my MP3 player which takes a 1.5 battery every 12 hours. I use it most of the time while working in the computer. So I want to use a usb port to get 5v and lower the voltage by using a 1.5 zener diode (*).
The problem is that I don't find such diode in the market. How can I regulate the voltage to 1.5?
(*): 5-1.5=3.5v
Mp3 draws about 100ma.
3.5/100ma = 35 hom resistor.
Rpower= 3.5*100=0.35W, Use 1/2 watts
ZdiodePower=1.5*100ma= .15w, Use 1/4 watts.
The problem is that I don't find such diode in the market. How can I regulate the voltage to 1.5?
(*): 5-1.5=3.5v
Mp3 draws about 100ma.
3.5/100ma = 35 hom resistor.
Rpower= 3.5*100=0.35W, Use 1/2 watts
ZdiodePower=1.5*100ma= .15w, Use 1/4 watts.