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I'm trying to make a power supply, and I need assistance!?
I'm trying use a 12 volt, 300mA plug-in power supply (from an old scanner) for my vintage pachinko machine. I just need 3 volts (for the EL wire), 4.5 volts (for LEDs,sound box), and 12 volts ( for wireless triggers). I made a voltage divider with resistors, connected it to the power supply, but my voltmeter keeps showing a constant 12 volts. What am I doing wrong?
I don't have any capacitors or diodes connected.
Thank you for your help.
The amount of voltage drop across a resistance depends on the amount of power through the resistor. I=ER converts to E=I/R. This means that with NO current flow, the resistance has no effect on the voltage.
A better system would use Zener Diodes to set the voltage, with a current "limiting" circuit on EACH voltage.
I suggest you obtain a basic electronics book and or a book on power supply designs.
I also don't think a single 300ma supply will be sufficient for all you want.
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