ELECTRONIC PROJECTS CIRCUIT &  DESIGN CIRCUITS & IDEAS CIRCUIT BRICKS CIRCUIT BLOX TEACHING RESOURCES QUIK THINKAZ SCHEMES OF WORK TUTORIALS SHOP REFERENCE
 Home > A Level Resources A LEVEL ELECTRONICS RESOURCES Modified: 16:35, 02 April 2022 This page was written for the old OCR Electronics course before 2008. The material here is still in that format but can be used for any Electronics/Systems & Control Qualifiaction. GCE - H065/H465 Electronics syllabus specification AS Level - H065 Content Checklist EZ-CPU SYSTEM For A-LEVEL control module. Z80 programming made easy! The EZ-CPU system has been developed to assist with the A2 Control module. This system has been developed by teachers and tested with great success. There is support material available, used in the very successful delivery of this module. FREE SOFTWARE AVAILABLE Specially written software to the EZCPU system. Download/upload files and write programs using the virtual EZCPU There is a range of material from exams to circuit examples, grouped in unit order. Material is being added all the time so please click Refresh a couple of times when visiting this page again. FORMATS: - CrocClips, - Livewire - GIF - PDF - Powerpoint - Word PAGE CONTENTS..... 5.1.1 - System Components 5.1.2 - Fundamentals of Circuit Building 5.1.3 - Operational Amplifier Systems 5.1.4 - Digital Systems 5.2.1 - Negative Feedback 5.2.2 - Positive Feedback 5.2.3 - Boolean Algebra & Synchronous Counters 5.2.4 - Analysis of systems 5.4.1 - Resonant Circuits 5.4.2 - Transistor Circuits 5.4.3 - Analogue Communication Systems 5.4.4 - Television Systems 5.4.5 - Digital Communication Systems 5.5.1 - DC Servo Control Systems 5.5.2 - Triacs 5.5.3 - Logic & Memory Systems 5.5.4 - Micro-processor Systems
 AS ELECTRONICS - 3826 FOUNDATIONS OF ELECTRONICS 2526 SYSTEM COMPONENTS KIRCHOFF CIRCUIT EXAMPLES - Current and voltage circuits - - CIRCUIT FUNDAMENTALS +/- 15 VOLT REGULATOR CIRCUIT - Good supply for operational amplifiers - - BASIC POWER SUPPLIES SUMMARY - Revision material for power supplies - LOGIC GATE MONOSTABLES - NAND & NOR gate monostables - - LED SERIES RESISTOR Worksheet - Calculating series resistors for LEDs - - POTENTIAL DIVIDERS Worksheet - Calculating voltages in potential dividers - 10 questions, from easy to tricky - READING OSCILLOSCOPES Worksheet - Calculating frequencies from scope traces - - WAVE DEFINITIONS - Square, Sine and Triangle wave definitions as formulas - ZENER REGULATOR EXAMPLES - Ways of regulating voltages - - OPERATIONAL AMPLIFIER SYSTEMS AUDIO VU METER - example of op-amps as comparators - - - Breadboard layout - CROSS-OVER DISTORTION - Example of distortion and eliminating it using an op-amp - - LED VOLTMETER - more op-amps as comparators - - - Breadboard layout -   LIGHT METER - even more op-amps as comparators - -  - Breadboard layout - TIMING WORKSHEET - Question on timing network and a comparator - - LOGIC SYSTEMS ASTABLE - NOT GATES - How a NOT gate astable works with detailed explanation - - BI-STABLES TO LATCHES - How a bi-stable is improved to become a latch using NAND gates - - BI-STABLES TO FLIP-FLOPS! - Bi-stable developed into a D-type flip/flop - - CHANGING NAND GATES TO NOR - Step by step presentation - COMBINING LOGIC GATES 1 - 3 tasks combining Logic gates and simulating the results to check - FRUIT MACHINE - Using 7 segment displays as reels and some logic utilising EXOR gates to check for wins - - FULL ADDER - 2 full adders forming a 2-bit adder with 7 segment outputs - - HALF ADDER - 2 logic gates form a simple single bit half adder - - HEXADECIMAL DECODER - Some extra logic and a 4511 - - LOGIC GATE MONOSTABLES - NAND & NOR gate monostables - - LOGIC GATE THRESHOLD TEST - A simple circuit with Breadboard layout to test input voltage levels of logic gates - MASTER/SLAVE D-TYPE FLIP-FLOP - logic gate construction of a D-type F/F - - NAND GATE SUMMING OF TERMS - how to use NAND gates instead of multiple types - - PRIME NUMBER DETECTOR - generating logic circuit from a Boolean expression - - SIGNAL PROCESSING 2527 NEGATIVE FEEDBACK ACTIVE FILTERS - An example of bass cut and treble cut filters - - FILTERS SUMMARY - Summary of Bass & Treble boost/cut active filters - GRAPHIC EQUALISER - a 5 channel graphic equaliser using op-amps as active filters - - NEGATIVE FEEDBACK SYSTEMS - Inverting/non-inverting amps and ramp generator - - PLOTTING FILTER CHARACTERISTICS - Step by step plotting filter characteristics on a graph - AUDIO FILTERING - 5 channel sound to light unit - - SUMMING AMPLIFIER CIRCUITS - A couple of example circuits mixing DC & AC signals - GUITAR FUZZ AMPLIFIER - Using an inverting amplifier with diode feedback clipping - - INVERTING AMPLIFIER - Uses an op-amp without a dual rail supply - - NON-INVERTING AMPLIFIER - Uses an op-amp without a dual rail supply - - INVERTING/NON-INVERTING AMPLIFIER - A switchable mode amplifier - - POSITIVE FEEDBACK DRILL SPEED CONTROLLER - A PWM supply using ramp generator and comparator - - ELECTRONIC ORGAN - A long-winded but effective organ using ramp/square oscillators - POSITIVE FEEDBACK SYSTEMS - Schmitt triggers and oscillators - - RAMP/WAVE OSCILLATOR - Schmitt trigger & ramp generator - - - Breadboard layout - RELAXATION OSCILLATOR - Inv. Schmitt trigger and RC network - - -Breadboard layout - BOOLEAN ALGEBRA & COUNTERS 24 HOUR CLOCK - Hours minutes and seconds using BCD counters & 7-segment decoders - - COUNTING IN BINARY - A powerpoint presentation showing a 4-bit binary count from 0 to 15 - D-TYPE BINARY RIPPLE COUNTER - How to create a binary ripple counter - ONE SHOT SEQUENCER - Using a F/F and counter to produce a 6 pulse burst - - RACE HAZARD - An example of Race Hazard effect when using binary ripple counters - - SYNCHRONOUS COUNTERS - Progresively shows how to make 2,3 and 4 bit counters with D-types and logic - - TRAFFIC LIGHT SEQUENCER - Traffic lights from a binary counter and very little logic - - ANALYSIS OF SYSTEMS AUDIO AMPLIFIER - A basic design showing 4 system blocks in a standard audio amplifier - - DARLINGTON PAIR - Current flow explained in an NPN Darlington pair configuration -
 A2 ELECTRONICS - 7826 COMMUNICATION CIRCUITS 2529 RESONANT CIRCUITS TUNED CIRCUITS - Some parallel tuned circuits using LC filters - TRANSISTOR CIRCUITS CMOS GATE AMPLIFIER - Logic gate answer to amplify small signals - - FULL BRIDGE MOTOR DRIVER - Full bi-directional control with safety control using bipolar transistors - - TRANSISTOR AMPLIFIERS - 3 different types of transistor amplifier - - ANALOGUE COMMUNICATION SYSTEMS ANALOGUE CABLE TRANSMISSION - How to overcome losses in transmission cables - - FREQUENCY MODULATING A 555 ASTABLE - An actual application for pin5!! - - TELEVISION SYSTEMS DIGITAL COMMUNICATION SYSTEMS 4-BIT ADC - A 4-bit digital to analogue converter - - 4-BIT ADC - Voltmeter with 7 segment display - - 4-BIT SUCCESSIVE ADC - Fast ADC using successive approximation method - much faster!! - - 8-BIT SUCCESSIVE ADC - 8-bit version. - - 4-BIT DAC - 4-bit digital to analogue converter - - 8-BIT DAC - 8-bit digital to analogue converter producing ramp waveform - - DIGITAL TRANSMISSION - Model of 4-bit digital streaming - DIGITAL WAVE GENERATOR - Creating waves using a binary word genrator and a DAC - - DIGITAL WAVE GENERATOR 2 - Creating waves with higher resolution - - FDM TRANSMITTER/RECEIVER - A method of sending control signal using Frequency Division Multiplexing - - FSK MODEM - Example of data transmission using Frequency Shift Keying modulation - - FREQUENCY TO VOLTAGE CONVERSION - Using the LM2917 for a few useful applications - RS232 4Bit TRANSMISSION - A simple 4 bit transmitter and receiver demonstrating the principle of RS232 - - CONTROL CIRCUITS 2530 SERVO SYSTEMS SERVO CONTROLLER - A 555 astable driving a monostable - - TRIACS LOGIC & MEMORY SYSTEMS BASIC REGISTERS - Examples of SIPO and PIPO registers using D-type F/F - - BASIC REGISTERS 2 - Examples of PISO and SIPO registers using D-type F/F - - COMPLEX REGISTERS - Serial in/out and parallel in/out - - MICROPROCESSOR SYSTEMS SERIAL ADDITION - A serial adder using 2 x 4bit values to produce a 5bit result - - SERIAL SUBTRACTION - A simple alteration to the adder - surprisingly simple - - EZCPU - The EZ-CPU page EZCPU WORKSHEETS Worksheets for use with the EZCPU covering the assembly language aspects of the Control Module (2530). Good examples of flowchart design and implementation. GLOSSARY OF TERMS - Glossary of Terms worksheet - EXAMS and TESTS OCR Test Papers from OCR web site POWER SUPPLY EXAM - Design of stabalised and regulated power supplies, 30 minutes - The following are authored by Michael W. Brimicombe and follow his book "Electronics Explained" which I use to aid delivery of the course. These are from his website and are a series of revision exercises and experiments covering various topics. IMPORTANT - The following are OCR papers and subject to copyright - you may only use these for personal revision use - downloading these papers is a an agreement by yourself to adhere to this regulation and all copyright associated with them.
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