òY Thursday, September 27, 2007Y
9:24 AM
hihi im suling here again im using the music period to post this so risky argh >.<>
òY Sunday, September 23, 2007Y
4:20 PM
*drumroll please* Its the nature world now..now lets go and explore the trees no larh its hardwood larh...OKay people here are some of it that we will be studying...Jelutong ----->not very easy or durable and its very easy to work with derh!~~examples of it is carvings and manufactured toys larh
Dark red meranti----->quite strong and durable can be quite difficult to work with so be careful!~~examples of it is furniture,flooring,door and window frames and plywood(wow :o)
Ramin----->quite strong and durable can be quite difficult to work with though.. T_T~~examples of it is furniture,kitchen cabinets,picture frames and plywood
Teak----->hard,strong and durable...can be quite easy to work with :) attractive grain~~examples of it is quality furniture,laboratory bench-tops and parquet flooring
Chengal------>hard,strong and durable,its easy to work with and it can be stained,polished or varnished ~~examples of it is garden benches,bridges and boats
Kapur------>VERY durable and stiff and has a camphor smell~~examples of it is formwork in construction,hulls of boats and decks of lorries
Nyatoh------>fairly strong and durable plus it can be stained and polished~~examples of it is beams,rafters,joists,furniture,plywood,door and window frames....
4:13 PM
People now lemme present to you the beloved fashion parade of NIGHTLIGHT lol hope you will like these fantastic pictures of nightlight and may everyone of 1e5 their nightlight have awesome results arh ~~ :P
3:23 PM
OKay now we have arrived to materials~~~tra la la
materials very easy larh is about choosing the correct or suitable material to make that specific product we can choose a lot of materials like recycled ones or from nature or man made here are some of it larh
First friends one important thing to remember is that YOU are the designer no one else so just go along with your feelings but sometimes the feeling must lead you to the right thing larh..
so little designers you must know the properties of the materials you are going to use so you wont make the wrong thing and regret later...you also must be creative with the appearance of your products you must know the aim of your product is for who and how to make the product interesting long lasting and attractive!!! :D
And arh last but not least people please be environmental friendly larh save the earth even if you really enjoy designing a product please save the earth too try to protect and preserve the materials while doing your product
Labels: SAVE THE EARTH LEH~~~~
3:18 PM
design is also about being innovative..are YOU innovative leh?
It is about looking for clever ways to design a product making a brand new product or improve on the design and functions of the product.....
3:04 PM
what is ergonomics?~~~
designing for comfort and safe use..
when you want your design to be ergonomic take note of...... :
- safety
- how user use it
- proportion
- size
- texture
2:46 PM
hey hey what is exactly design and technology huh? here are some of the pictures...
okay...design is about creating a product that does its job well..The actions or activities a product perform are called functions. Design is all about creating a product that has a distinctive look or feel about it..The overall look or appearance of a product is called aesthetics :)
2:41 PM
whahaha im back again for more design and technology action liao after a very very long winter sleep lol no larh i just scared mr soo will scold me for my blog so out-dated derh so remember to continue support us larh.. heres a cute picture to make you glued to our blog hehe :)
òY Sunday, September 2, 2007Y
1:17 PM
Electronics: ResistorsResistors are used to control the flow of current in a circuit, by 'resisting' the flow of electrons. The value of a resistor is measured in ohms (R).Resistance is defined as the ratio of the potential difference (voltage) across a conductor, to the current flowing through it ie.:Resistance (ohms) = Voltage (volts)/Current (amps)
Electronics: Resistors
Resistors are available in values from fractions of ohms up to many millions of ohms (Megohms) although only certain 'preferred' values are readily available. To identify the resistance value of resistors a 'colour code' system is often used.
Electronics: Variable Resistors
Variable resistors or potentiometers are used where the flow of current in a circuit needs to be occasionally varied such as for:-Volume ControlFrequency ControlOutput Voltage ControlThey come in a range of sizes.
Electronics: Diodes
Diodes fall broadly into two types - rectifier and signal. Rectifier diodes are used in power supplies to convert a.c. to d.c. They may have to handle high currents and voltages but normally work at low frequencies (typically 50 Hz). Signal diodes normally handle much lower power but may be required to operate at much higher frequencies (many MegaHertz).Diodes allow current to pass through them in one direction only. In the forward direction, the resistance is low (typically 5 ohms - measured on an analogue ohmmeter). In the reverse direction, the resistance is very high. (Greater than 20 Meg-ohms).Uses include rectifiers in power supplies, signal demodulators and back EMF limiters in inductors.
Electronics: LEDs
Light Emitting Diodes (LEDs) come in different colours, shapes, sizes and brightness. The more common colours being red, green and yellow. They are also available in bi and tri - colour versions Round ones come in 3, 5 and 8mm sizes. There are also rectangular, square and bar types. Flashing types are available and seven segment displays are made of a number of LEDs in a particular pattern.LEDs are easily damaged by excess current therefore it is normal to connect the LED to the supply via a series current limiting resistor. The value of this resistor is not critical but is usually within the range 100 - 330R. Polarity must be observed when connecting LEDs (it should be noted that LEDs are damaged by reverse biased voltages larger than about 6 volts). The Anode is connected to the positive supply via the limiting resistor. The Cathode is connected to the negative supply.
Electronics: Transistors
Transistors are used as electronic switches and current amplifiers. They have three "legs" - base , collector and emitter. A small current to the base switches on the transistor allowing a much larger current to flow between collector and emitter. The ratio of the collector current to the base current is known as the "amplification" or "gain" of the transistor (hfe = Ic/Ib).They come in various different shapes and sizes and it is important to decide which type is required at the outset.Factors to be considered are voltage and power handling capacities, cost and availability. Transistors require a base voltage of at least 0.6V with respect to the emitter to "turn on". (Darlington Pair transistors require 1.2 V). A limiting resistor - typically 1K is required in the base circuit of the transistor stage to prevent overrunning and hence overheating and destruction of the transistor. Transistors come in NPN and PNP types. It is important to use the correct type when designing and building circuits.
Electronics: 555
This chip is designed to function as a monostable (one stable state) multivibrator or as an astable (free running) multivibrator. It contains the equivalent of approximately 20 transistors,resistors, diodes etc. It is used for timing or switching circuits which give pulsed or digital outputs.Data:Pin1 connected to the negative (-ve) supply2 TRIGGER a voltage greater than 1/3 supply volts enables the chip.3 OUTPUT is equal to the supply volts when the output is on (600mW max).4 RESET when connected to positive supply volts. 5 CONTROL OUTPUT applying a variable voltage to this pin varies the frequency of the output.6 THRESHOLD a voltage higher than the threshold voltage (2/3 supply volts) turns on the output.7 DISCHARGE when the output is turned on the pin goes to 0v allowing discharge of any connected capacitor.8 positive supply voltage (+ve) (4.5v - 16v)Uses: Oscillators, triggers, inverters, timers
Electronics: 741 OPERATIONAL AMPLIFIER (OP-AMP)
This chip is designed to accept two inputs on pins 2 and 3. The difference between the inputs is amplified to give the output. If the voltage on pin 2 is greater than pin 3 the output is negative. If pin 3 is greater than pin 2 the output is positive. The Op-Amp gives a voltage gain as opposed to a transistor which gives a current gain.Uses: Switching, amplifiers, oscillators and analogue computing.Data:Pin1 OFFSET NULL not normally used2 inverting input3 non inverting input4 0V is connected to the zero supply5 OFFSET NULL not normally used6 OUTPUT7 positive (+ve) supply voltage (+3V to +18V)OFFSET NULL is used to balance output in high gain applications
Electronics: 4001 Quad 2 input NOR Gate
This chip contains four (QUAD) NOR gates, each with 2 inputs, which can operate individually or in combination.Uses: NOR logic gate. Found on electronic resource boards - Short Time Delay 1, Flip Flop 1, Set Reset Flip Flop, Motor Speed ControlIn normal use:-Pin 14 (+3 to 15v) is connected to the positive (+ve) supply.Pin 7 is connected to the negative (-ve) supply.All unused inputs should be connected to the positive supply.N.B. The output signal is low powered and normally needs amplification to drive output devices.Each logic gate works as shown in the truth table.Input 1 Input 2 Output(eg pin 1) (eg pin 2) (eg pin 3)0 0 10 1 01 0 01 1 0Connecting two inputs of a gate together (eg 1 & 2) makes the gate act like a NOT gate or INVERTER.
