Lab: Electronics / Circuit Building

 

LED Circuit Build Outs

1. Single LED Circuit 

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Breadboard drawing of a 220-ohm resistor and an LED powered by a 5-volt regulator . The breadboard is wired above, with a 5-volt voltage regulator and DC power jack. One side of the resistor is connected to the left side voltage bus of the breadboard. The other side is connected to row 15. The anode of an LED is connected to row 15 as well. The cathode of the LED is connected to row 16. A black wire connects row 16 to the left side ground bus.

 

 

2. A Switched LED Circuit

Schematic image of a pushbutton, a 220-ohm resistor and an LED connected to a 7805 5-volt regulator. At left, there is a power plug. The positive terminal of the power plug is connected to the voltage input of a 7805 voltage regulator. The negative terminal of the power plug is connected to the ground terminal of the regulator. The voltage output of the regulator is connected to one side of a pushbutton. The other side of the pushbutton is connected to a 220-ohm resistor. The other side of the resistor is connected to the anode of an LED. The cathode of the LED is connected to the ground terminal of the regulator. Breadboard drawing of a solderless breadboard with a 7805 voltage regulator mounted on it as shown in the drawings above. The regulator is connected to a DC power plug, and the ground and voltage output of the regulator is connected to the voltage and ground bus rows on the right side of the breadboard. The ground and voltage bus rows on the right are connected to the ground and voltage bus rows on the left with wires at the bottom of the board. A pushbutton is mounted across the center of the breadboard, connected to rows ten and twelve. A red wire connects row ten to the voltage bus on the left side of the board. A 220-ohm resistor is connected to row twelve on the left side of the center section of the board. Its other end is connected to row sixteen in the center area. An LED is connected to another hole in row sixteen. The other side of the LED is connected to a hole in row seventeen. Another hole in row seventeen connects to the ground bus on the right side of the board.

 

 

 

 

 

 

3.Components in a Series

 

 

Schematic image of a pushbutton, a 220-ohm resistor and two LEDs connected to a 7805 5-volt regulator. At left, there is a power plug. The positive terminal of the power plug is connected to the voltage input of a 7805 voltage regulator. The negative terminal of the power plug is connected to the ground terminal of the regulator. The voltage output of the regulator is connected to one side of a pushbutton. The other side of the pushbutton is connected to a 220-ohm resistor. The other side of the resistor is connected to the anode of an LED. The cathode of the LED is connected to another LED's anode. The cathode of the second LED is connected to the ground terminal of the regulator. Breadboard drawing of a solderless breadboard with a 7805 voltage regulator mounted on it as shown in the drawings above. The regulator is connected to a DC power plug, and the ground and voltage output of the regulator is connected to the voltage and ground bus rows on the right side of the breadboard. The ground and voltage bus rows on the right are connected to the ground and voltage bus rows on the left with wires at the bottom of the board. A pushbutton is mounted across the center of the breadboard, connected to rows ten and twelve. A red wire connects row ten to the voltage bus on the left side of the board. A 220-ohm resistor is connected to row twelve on the left side of the center section of the board. Its other end is connected to row sixteen in the center area. An LED is connected to another hole in row sixteen. The other side of the LED is connected to a hole in row seventeen. A blue wire connects row seventeen to row twenty. Another LED's anode is connected to row twenty. Its cathode is connected to row twenty-one. A black wire connects row twenty-one to the the ground bus on the right side of the board.

 

 

 

4. Components in Parallel/Measuring Amperage

Schematic image of a pushbutton, a 220-ohm resistor and three LEDs in parallel connected to a 7805 5-volt regulator. At left, there is a power plug. The positive terminal of the power plug is connected to the voltage input of a 7805 voltage regulator. The negative terminal of the power plug is connected to the ground terminal of the regulator. The voltage output of the regulator is connected to one side of a pushbutton. The other side of the pushbutton is connected to a 220-ohm resistor. The other side of the resistor is connected to the anodes of three LEDs. The cathodes of the three LEDs are connected to the ground terminal of the regulator.A pushbutton is mounted across the center of the breadboard, connected to rows ten and twelve. A red wire connects the switch to the left side voltage bus. A 220-ohm resistor is connected to row twelve on the left side of the center section of the board. Its other end is connected to row sixteen in the center area. Three LEDs' anodes are connected to another hole in row sixteen. The cathodes of the LEDs are connected to holes in row seventeen. A black wire connects row seventeen to the ground bus on the left side of the board.

 

 

 

 

 

5. Generating a Variable Voltage with a Potentiometer

Schematic image of a potentiometer controlling an LED. At left, there is a DC power plug. The positive terminal of the power plug is connected to the voltage input of a 7805 voltage regulator. The negative terminal of the power plug is connected to the ground terminal of the regulator. The voltage output of the regulator is connected to one side of a potentiometer. The other side of the potentiometer is connected ground. The wiper of the potentiometer is connected to a 220-ohm resistor. The other side of the resistor is connected to the anode of an LED. The cathode of the three LEDs are connected to ground.Breadboard drawing of a potentiometer controlling an LED. A 7805 5-volt voltage regulator powers the board as shown in the circuits above. A potentiometer's outer connections are connected to the voltage bus and ground bus on the left side of the board. The center of the potentiometer connects to row seventeen on the left side of the center section of the board. A 220-ohm resistor is connected to row seventeen on the left side as well. Its other end is connected to row twenty-one in the left center area. An LED's anode is connected to another hole in row twenty-one. The LED's cathode is connected to row twenty-two. A black wire connects row twenty-two to the ground bus on the left side of the board.

 

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