User:Paulacruz
H O M E W O R K S
Homework 01 | Understanding electronic circuits
Circuit with one resistor | Battery 6.73V | Resistor 471 Ohm
Voltage across resistor 6,1 V | Current through resistor 12,9 A
↳ Double resistor (1k)
Voltage 6,35 V | Current 6,4 A
↳ Half Resistor (220 Ohms)
Voltage 5,5 V | Current 25,2 A
Circuit with two resistors | Battery 6,7 V | Resistors 470 Ohm
Voltage across resistor ¹ 3,2V Current resistor ¹ 6,8 A
Voltage across resistor ² 3,2V Current resistor ² 6,8 A
↳ Double one of them | Battery 6,7 V | Resistor 470 Ohm and 940 Ohm
Voltage resistor ¹ (double) 4,4 V Current resistor ¹ (double) 4,4 A
Voltage resistor ² 2,05 V Current resistor ² 4,4 A
↳ Half Value of resistor | Battery 6,7 V | Resistor 470 Ohm and 220 Ohm
Voltage resistor ¹ 2,05 V Current resistor ¹ (half): 9,2 A
Voltage resistor ² 4,25 V Current resistor ² 9,2A
Circuit with four resistors | Battery 6,5 V | Fours resistor of 470 Ohms (total of 1410 Ohms)
Voltage across all resistors 1,6 V Current across all resistors 3,5 A
↳ Double one of them
Voltage resistor double 2,7V | Voltage resistor rest 1,27V | Current 2,7A
↳ Half Value of resistor
Current 4 A
Voltage resistor half 0,87 V Voltage resistor rest 1,87 V
Two parallel | Battery 6,4 V | Resistor 470 Ohms
Voltage resistors 5,7V Current both 12,2 A
↳ Double resistor
Voltage normal 5,85 V Voltage double 5,85 V
Current normal 12,5 A Current double 5,9 A
↳ Half resistor
Voltage half 5,36 Voltage normal 5,36
Current normal 11,5 A Current half 24,5 A
Three parallel | Battery 6,3 V | Resistors 470 Ohms
Voltage resistors: 5,5V Current 12,9 A
↳ Double resistor
Voltage 5,6 V
Current double 6,3 A Current normal 12,9 A
↳ Half resistor
Voltage 5,16 V
Current half 23,3 A Current normal 10,7 A
LED lamp
Less resistance ⟿ more light
Homework 02 | To find and build a (small) circuit using the 555 timer
A Circuit that flashes an LED on and off. [[1]]
↳ This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2.
Parts lists
1x - NE555 Bipolar Timer
1x - LED (Red)
1x - 470K Resistor (1/4W)
2x - 1K Resistor (1/4W)
1x - 1μF Electrolytic Capacitor (16V)
1x - 9V Voltage Battery
Comments and observations
• Smaller resistors led into faster flashing lights.
• To add more LEDs, it is needed to create a "bridge" (using wire).
• More LEDs will use more of the battery. You need to check out the value of the battery before adding LEDs. Adding LEDs to the circuit may overload the 555 Timer. In order to avoid it, it should be add more resistors in the circuit.
Homework 03 | Recreating schematic layout
1. Download and install CadSoft EAGLE
2. Download the EAGLE 555 blink template with schematic and PCB layer here: Media:Eagle_555_template.zip .
3. The template contains all the components needed to create a simple 555 Astable circuit (aka a Blinking LED)
4. Create the PCB layout
5. Following the SparkFun tutorials on EAGLE (see resources below) will be VERY helpful along the way!!
6. Don't not make your PCB larger than 3 x 3 cm (as in the template).
7. Don't make your traces smaller than ~0.3mm (12mil)
P E R S O N A L ∴ I N S P I R A T I O N
• How To Draw Mushrooms On An Oscilloscope With Sound [[2]]
• Aram Bartholl | PAINT figure drawing class!! [[3]]
• Aram Bartholl | On (light installation) [[4]]
• Aram Bartholl | Papierpixel (light installation) [[5]]
T U T O R I A L S & H E L P
• Como interpretar diagramas [[6]]
• Como ler esquema eletrônico, eletrônica, eletricidade, circuito impresso, fenolite [[7]]
• 3x3x3 LED Cube Circuit [[8]]
