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16 Cards in this Set
- Front
- Back
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What may cause changes on dc output voltage?
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ac line voltage and load resistance
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What is the ideal situation for regulation?
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zero-percent load regulation
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What is a common percent of regulation for regulators?
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0.1%
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What are two types of regulators?
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series or shunt
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What serves an indication of how much the output voltage changes over a range of load resistance values?
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percent of regulation
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What is a diode that blocks current until a specified voltage is applied?
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Zener diode
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What diodes are available with different breakdown voltages and conducts only when the Zener voltage reached?
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Zener diode
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What keeps the reference voltage applied to Q1 base?
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Zener diode, CR1, and, current limiting resistor R1
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What make up the regulator circuit?
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pass transistor, Q1, current limiting resistor, R1, Zener diode, CR1
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Where does the regulator sense the change of output voltage?
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at the emitter of Q1
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What determines the the bias of Q1?
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the voltage drop across fixed resistor, Rs, and the current limiting resistor, R1
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What happens when the bias of transistor increases?
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increases in the voltage drop across fixed resistor, and decrease in the load voltage
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What happens to the forward bias of Q1 when there is an increase in the input voltage or an increase in the load current?
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increase in the forward bias
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What happens when the forward bias increases?
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increases the current flow and decreases the resistance of transistor
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How Rv compensates the change if the load resistance increases?
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Rv lowers its resistance
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What happens to the resistance of the transistor if any decrease in the base-emitter forwards bias across Q1?
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the resistance increases
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