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  • How to create +/- voltage using one power supply

    The voltage divider will work, but the voltage across each resistor will drop as the load increases, so if you are going to use light loads make sure the voltage is high enough so it won't go to low for your application. The total voltage will be the same, but how much is positive and negative is not predictable, but it works in a pinch. A much better, but slightly more complicated circuit for beginners is a LM317, LM337 dual power supply. The output voltage will not vary for any load, but current maxes out at 1 amp without adding transistor boosts. Check out this website where you can calculate the voltage drop across a voltage divider with a resistor in parallel with one load (though in this case both resistors have some load)http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv....see more »The voltage divider will work, but the voltage across each resistor will drop as the load increases, so if you are going to use light loads make sure the voltage is high enough so it won't go to low for your application. The total voltage will be the same, but how much is positive and negative is not predictable, but it works in a pinch. A much better, but slightly more complicated circuit for beginners is a LM317, LM337 dual power supply. The output voltage will not vary for any load, but current maxes out at 1 amp without adding transistor boosts. Check out this website where you can calculate the voltage drop across a voltage divider with a resistor in parallel with one load (though in this case both resistors have some load)http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv.html

    The voltage divider will work, but the voltage across each resistor will drop as the load increases, so if you are going to use light loads make sure the voltage is high enough so it won't go to low for your application. The total voltage will be the same, but how much is positive and negative is not predictable, but it works in a pinch. A much better, but slightly more complicated circuit for beginners is a LM317, LM337 dual power supply. The output voltage will not vary for any load, but current maxes out at 1 amp without adding transistor boosts. Check out this website where you can calculate the voltage drop across a voltage divider with a resistor in parallel with one load (though in this case both resistors have some load)http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv....see more »The voltage divider will work, but the voltage across each resistor will drop as the load increases, so if you are going to use light loads make sure the voltage is high enough so it won't go to low for your application. The total voltage will be the same, but how much is positive and negative is not predictable, but it works in a pinch. A much better, but slightly more complicated circuit for beginners is a LM317, LM337 dual power supply. The output voltage will not vary for any load, but current maxes out at 1 amp without adding transistor boosts. Check out this website where you can calculate the voltage drop across a voltage divider with a resistor in parallel with one load (though in this case both resistors have some load)http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv.html

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