EXAM PAPERS AND MARK SCHEMES. Find past papers and mark schemes for your exams, and specimen papers for new courses.
EXAM PAPERS. PCB Manufacture. For a certain number of projects, including first-prototype, surface mount 'breadboarding', layout experimentation, rapid multiple-revisions, and 1-hour deadlines doing your own PCB etching can be quick, clean, and very very inexpensive.
The method set up in the Media Lab basement is somewhat-similar to that of large pcb manufacture shops, except in scale and automation. There is no system for through-hole plating, automated drilling/routing or multilayer design. However, you can make precisely aligned doublesided boards with simple registration techniques. Added 2/7/04: The etching setup is now in the Holography darkroom, in the LL across from the shops. To get access/training please email or visit me (ladyada@ml in office 020D) PCB Making-Part 2-Photo Resist Method of Etching a Printed Circuit Board. PCB Making-Part 1-Photo Resist Method of Etching a Printed Circuit Board. Outputs. Output Components. Www.clarvis.co.uk Design & Technology Resources ©2011 E.Clarvis An output transducer is simply a component that converts electrical energy into light, sound, movement or heat.
Relays. Seven-segment display. A typical 7-segment LED display component, with decimal point A seven-segment display (SSD), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays.
Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information.[1] Concept and visual structure[edit] The individual segments of a seven-segment display. Light-emitting diode (LED) How Light Emitting Diodes Work" Light emitting diodes, commonly called LEDs, are real unsung heroes in the electronics world.
They do dozens of different jobs and are found in all kinds of devices. Among other things, they form numbers on digital clocks, transmit information from remote controls, light up watches and tell you when your appliances are turned on. Collected together, they can form images on a jumbo television screen or illuminate a traffic light. Basically, LEDs are just tiny light bulbs that fit easily into an electrical circuit. But unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they don't get especially hot. In this article, we'll examine the technology behind these ubiquitous blinkers, illuminating some cool principles of electricity and light in the process.
Opto Isolator. Switches. Switches. Switches are electronic components that are used to break electrical circuits, interrupting the current or diverting it from one conductor to another.
They can control the flow of power within a device, domestic circuit or appliance, and switches are found in all manually or automatically operated circuits. Rapid Online stocks a comprehensive range of industrial switches, microswitches and toggle switches including control unit switches, edge and DIL switches, key and keyboard operated switches, latching PCB switches, push-button switches, rotary, slide and tactile switches. Symbols. Resistors. Resistors. Capacitors. Capacitors. Other Revision Sites. GCSE ELECTRONIC PRODUCTS Edutek. Interactive learn and test zone. GCSE REVISION. Can you calculate the current limiting resistor needed when using an LED to protect it: • Find the voltage across R, by subtraction. • Note the maximum current through the LED. • Calculate R, using R = V/I • Choose the next largest preferred value.
Design & Technology Resources. Www.clarvis.co.uk Design & Technology Resources ©2011 E.Clarvis Operational Amplifiers and Comparators PIC Chips Peripheral Interface Controllers Potential Divider Exercises Part no.1 Systems & Symbols.
Integrated circuits. 555 timer. 555 Timer Navigation Custom Search Learn about the 555 by building the DOCTRONICS Safety Lights Project: 1.
Pin connections The 555 timer is an extremely versatile integrated circuit which can be used to build lots of different circuits. 555 Timer. The 555 Asatble Circuit. The 555 Monostable Circuit. 4017 Decade Counter. GCSE Bitesize: Forms of mechanical switch and switch bounce. 741 Operational Amplifier. The Thyristor. Thyristors. Design & Technology Resources. Low Power Multi-Voltage Desktop Power Supply : Multi Voltage Power Supplies : Maplin Electronics.
Shop With Confidence We offer a 28 day returns policy. We want our customers to be 100% satisfied every time they shop with us, should you change your mind we are here to help. If you are not completely satisfied with your purchase, you can return the item to us in its original condition within 28 days of receipt and we will issue a full refund, or replace the item, if preferred. We offer two ways to return a product either visit any one of our stores nationwide or by post which ever you prefer. For further information about our returns policy visit our help page if you wish to return an item please visit our returning an item help page. Delivery Options United Kingdom Options Price Option Delivered Reserve for store pickup Ready for collection within 20 minutes✝ School Electronics: Circuits and modules for GCSE Electronic Products. Revision Notes Zip File©Christopher Leigh These notes are in "pdf" format and go through the AQA specification for Electronic Products section by section.
Wind up radio, solar powered radio, energy efficient DAB radios - EthicalSuperstore.com. Rapid catalogue. Transistor Basics. Diagram 'A' shows an NPN transistor which is often used as a type of switch.
A small current or voltage at the base allows a larger voltage to flow through the other two leads (from the collector to the emitter). The circuit shown in diagram B is based on an NPN transistor. When the switch is pressed a current passes through the resistor into the base of the transistor. The transistor then allows current to flow from the +9 volts to the 0vs, and the lamp comes on. The transistor has to receive a voltage at its ‘base’ and until this happens the lamp does not light. Transistors. Field Effect Transistors. Darlington Pairs. Tutorial: Op Amps. << Go Back to Other Tutorials Need to amplify a small input voltage? Need to mix several voltage sources? Maybe you want to make an audio equalizer or signal generator? The Operational Amplifier is your man. We learned a lot about the Op Amp when building our iPod Preamplifier, and we thought it would be useful to share.
Msc-ks4technology.wikispaces. Operational Amplifiers are voltage amplifiers, and transistors are current amplifiers Operational Amplifiers often known as Op-Amps are used in a range of circuits. They are generally used to amplify weak electrical current in a circuit. It is one of the most versatile devices in all of electronics. Op-amps are integrated circuits that cram the equivalent of many transistors, resistors and capacitor into a small silicon chip. It is not important to know what the circuit looks like but to understand the functions the Operational Amplifiers can perform. The most popular type of Op Amp is the 741 as shown below as 8 pin dual layout IC's. Microcontrollers. Logic. PIC. PIC Microcontrollers PIC Stands for: Peripheral Interface Controller or Programmable Integrated Circuit A PIC is a chip that can be programmed to do a number of different functions. They are used in electronic products such as: remote controls, microwave ovens, car remote key fobs, washing machines, and much more.
PICAXE. The Diode. Diodes. Power supplies. Batteries.