Whatever diode model you choose, I highly recommend one with a zener voltage rating greater than the voltage of a single battery, for a maximum learning experience. It is important that you see how a zener diode functions when exposed to a voltage less than its breakdown rating. Record this voltage drop for future reference. Modify the circuit by connecting two 6-volt batteries in series, for 12 volts total power source voltage. Do you see how the diode voltage never exceeds a level of 12 volts? Zener diodes are frequently used as voltage regulating devices because they act to clamp the voltage drop across themselves at a predetermined level.
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Whatever diode model you choose, I highly recommend one with a zener voltage rating greater than the voltage of a single battery, for a maximum learning experience. It is important that you see how a zener diode functions when exposed to a voltage less than its breakdown rating. Record this voltage drop for future reference. Modify the circuit by connecting two 6-volt batteries in series, for 12 volts total power source voltage.
Do you see how the diode voltage never exceeds a level of 12 volts? Zener diodes are frequently used as voltage regulating devices because they act to clamp the voltage drop across themselves at a predetermined level. Whatever excess voltage is supplied by the power source becomes dropped across the series resistor. However, it is important to note that a zener diode cannot make up for a deficiency in source voltage.
For instance, this volt zener diode does not drop 12 volts when the power source is only 6 volts strong. It is helpful to think of a zener diode as a voltage limiter: establishing a maximum voltage drop, but not a minimum voltage drop.
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