http://www.linuxretail.com/power-divider-2/
Power Divider
I'm trying to make a Power Supply, and I need help!?
I'm trying to use a 12 volt, 300 mA plug-in power (of a age scanner) from my vintage pachinko machine. I only need 3 volts (for the EL wire), 4.5 volts (for the LED, sound box) and 12 volts (for active wireless). I made a voltage divider with resistors, connected to the power supply, but my voltmeter is showing a constant 12 volts. What I'm doing wrong? I have no capacitors or diodes. Thanks for your help.
The amount of voltage drop across the resistor depends on the amount energy through resistance. I makes ER = E = I / R. This means that no current flow, resistance has no effect on blood. A better system uses Zener diodes to set the voltage with a current "limited" in each circuit voltage. I suggest you get a basic e-book and / or a book on power designs. Nor do I believe that a single 300MA be enough to supply everything you want.
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