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Basic Circuits TEST YOUR BRAIN!

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Creates a set voltage Potential Dividers

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**Potential Divider Vout = 10 x 100 = 1000 = 5V 100 +100 200**

R1 = 100 Vs = 10V R2 = 100 Vout = 5V Vout = 10 x 40 = 400 = 6.6V R1 = 20 Vs = 10V R2 = 40 Vout = 6.6V Vout = 10 x 20 = = 3.3V R1 = 40 Vs = 10V R2 = 20 Vout = 3.3V R1 R2 Vs Vout = Vs x R2 R1 + R2

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Creates an adjustable voltage Potentiometer

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Potentiometer 10V 10V VR1 Volts

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Potentiometer 10V 7.5V VR1 Volts

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Potentiometer 10V VR1 5V Volts

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Potentiometer 10V VR1 2.5V Volts

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Potentiometer 10V VR1 0V Volts

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Converts a light level into a voltage LDR Potential Divider

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LDR Potential Divider 10V Vout Volts LDR Resistance

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LDR Potential Divider 10V Vout Volts LDR Resistance

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LDR Potential Divider 10V Vout Volts LDR Resistance

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LDR Potential Divider 10V Vout Volts LDR Resistance

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LDR Potential Divider 10V Vout Volts LDR Resistance

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Compares two different input voltages Comparator

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**Inverting > Non-inverting**

Comparator Inverting > Non-inverting

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**Inverting = Non-inverting**

Comparator Inverting = Non-inverting

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**Inverting < Non-inverting**

Comparator Inverting < Non-inverting

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LED lights on when it is dark Light Sensor

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**Light Sensor - + Vout 10V Inverting input voltage Output voltage LDR**

Resistance Non-Inverting input voltage

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**Light Sensor - + Vout 10V Inverting input voltage Output voltage LDR**

Resistance Non-Inverting input voltage

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**Light Sensor - + Vout 10V Inverting input voltage Output voltage LDR**

Resistance Non-Inverting input voltage

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**Light Sensor - + Vout 10V Innverting input voltage Output voltage LDR**

Resistance Non-Inverting input voltage

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Produces continuous pulses 555 Timer Astable Circuit

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555 Astable Circuit F = (R1+2R2) x C1

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555 Astable Circuit SMALL CAPACITOR HIGH FREQUENCY

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555 Astable Circuit LARGE CAPACITOR LOW FREQUENCY

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**555 Timer Monostable Circuit**

Produces a pulse of a set length 555 Timer Monostable Circuit

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555 Monostable Circuit T = 1.1 x C1 x R1

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555 Monostable Circuit Output Trigger

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555 Monostable Circuit

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**Field Effect Transistor (FET)**

Allows a voltage to control a large Current. Field Effect Transistor (FET)

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**Transistor Driver A small current on the base creates a large current**

through the speaker Transistor Driver C B E

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**Transistor Driver A small current on the base creates a large current**

through the lamp Transistor Driver C B E

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**Field Effect Transistor (FET)**

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**FET Driver A voltage on the gate controls the current through**

the lamp. FET Driver D G V S

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Logic Gates

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AND

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AND Gate A=0 A B Q=0 Q B=0 Truth Table A B Q

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AND Gate A=0 A B Q=0 Q B=1 Truth Table A B Q 1

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AND Gate A=1 A B Q=0 Q B=0 Truth Table A B Q 1

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AND Gate A=1 A B Q=1 Q B=1 Truth Table A B Q 1

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OR

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OR Gate A A=0 Q=0 B=0 Q B Truth Table A B Q

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OR Gate A A=0 Q=1 B=1 Q B Truth Table A B Q 1

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OR Gate A A=1 Q=1 B=0 Q B Truth Table A B Q 1

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OR Gate A A=1 Q=1 B=1 Q B Truth Table A B Q 1

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NOT

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NAND

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NOR

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**Resistor A resistor limits the amount of current flowing in a circuit**

Symbol

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Digital Electronics Dan Simon Cleveland State University ESC 120 Revised December 30, 2010.

Digital Electronics Dan Simon Cleveland State University ESC 120 Revised December 30, 2010.

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