Cambridge
TECHNICALS
CAMBRIDGE TECHNICALS
IN ENGINEERING
LEVEL 3 UNIT 5 – ELECTRICAL AND
ELECTRONIC DESIGN
RESOURCES LINK
April 2015
Introduction
Resources Link is an e-resource, provided by OCR, for teachers of OCR
qualifications. It provides descriptions of, and links to, a variety of independent
teaching and learning resources that you may find helpful.
In Resources Link you will find details of independent resources, many of which are free:
where this is the case this has been indicated.
If you know of other resources you would like to see included here, or discover
broken links, please let us know. We would also like to hear from you if have any
feedback about your use of these, or other, OCR resources. Please contact us at
resources.feedback@ocr.org.uk.
We leave it to you, as a professional educator, to decide if any of these resources are
right for you and your learners, and how best to use them.
2
Cambridge
TECHNICALS
Resources Link
Contents
Electrical Circuit Theory and Technology
5
Diodes (circuit protection)
25
Electrical and Electronic Principles
6
Transformer basics
26
Unit and Circuit Symbols
7
Faraday’s Law
27
Resistor Combinations
8
Lenz’s Law
28
Ohm’s Law and Power examples
9
Electric motors and generators (introduction)
29
Kirchhoff’s Laws
10
DC motor types (series and shunt)
30
RC circuits
11
Motors (AC and DC)
31
What is alternating current (AC)?
12
Electromagnetic Compatibility
32
The AC Waveform
13
Electromagnetic Compatibility
33
Phase Difference and Phase Shift
14
System diagrams (basic introduction)
34
Phase Difference and Phase Shift
15
Open and Closed loop systems and block diagrams
35
Resistors, capacitors and inductors in AC circuits
16
Block Diagrams
36
Power Factor 17
Sensors and Transducers
37
Filters (low and high pass)
18
Sensors and Transducers
38
Battery types
19
Diodes39
Solar (PV) Cells
20
Transistors (switch)
40
Rectifier circuits
21
Transistor (common emitter amplifier)
41
Voltage regulators
22
Darlington Pair
42
Power supplies and load regulation
23
Darlington Pair
43
Fuses and circuit breakers
24
Op Amps – comparator
44
Cambridge
TECHNICALS
Resources Link
3
Contents
The summing op-amp
45
Online circuit simulator
46
Online op-amp simulator (from Texas Instruments)
47
Introduction to digital logic gates
48
Logic gate truth tables
49
Online logic simulator
50
Basic flip flops
51
The D-Type flip flop
52
JK and T type flip flops
53
Online simulation software
54
BCD Counter
55
Display Decoder
56
Data sheets online
57
Embedded systems - application of programmable devices
58
Microprocessors and Microcontrollers
59
Programmable Interface Controller (PIC)
60
Programmable Logic Controller (PLC)
61
System layouts for programmable devices – the microwave oven
62
4
Cambridge
TECHNICALS
Resources Link
Electrical Circuit Theory and Technology (John Bird, 2013)
Description:
A text book providing comprehensive coverage of
circuit theory and electrical/electronic devices.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
£30.39
Format:
Paperback or Kindle Book
http://www.amazon.co.uk/Electrical-Circuit-Theory-Technology-John/
dp/0415662869/ref=sr_1_2?ie=UTF8&qid=1417770198&sr=8-2&keyword
s=john+bird+electrical+and+electronic+principles+and+technology
5
Cambridge
TECHNICALS
Resources Link
Electrical and Electronic Principles (John Bird, 2014)
Description:
A text book providing comprehensive coverage of
electrical and electronic principles.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
£25.64
Format:
Paperback or Kindle Book
http://www.amazon.co.uk/Electrical-Electronic-Principles-TechnologyJohn/dp/0415662850/ref=sr_1_1?ie=UTF8&qid=1417770198&sr=81&keywords=john+bird+electrical+and+electronic+principles+and+
technology
6
Cambridge
TECHNICALS
Resources Link
Unit and Circuit Symbols
Description:
Comprehensive resource presenting standard
electrical units and circuits symbols. Web page with
PDF to download. Institution of Engineering and
Technology (IET).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Webpage with PDF download
http://www.theiet.org/students/resources/units-symbols.cfm
7
Cambridge
TECHNICALS
Resources Link
Resistor Combinations
Description:
Excellent introduction to resistor circuits including
resistors in series and parallel.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.physicsclassroom.com/class/circuits/Lesson-4/
Combination-Circuits
8
Cambridge
TECHNICALS
Resources Link
Ohm’s Law and Power examples
Description:
Recap on Ohm’s Law and power calculations.
Includes links to further tutorials on DC networks.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/dccircuits/dcp_2.html
9
Cambridge
TECHNICALS
Resources Link
Kirchhoff’s Laws
Description:
A good introduction to Kirchhoff’s first and second
laws.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/dccircuits/dcp_4.html
10
Cambridge
TECHNICALS
Resources Link
RC circuits
Description:
An explanation with examples of RC circuits.
Includes RC time constant.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/rc/rc_1.html
11
Cambridge
TECHNICALS
Resources Link
What is alternating current (AC)?
Description:
Introduction to AC theory – includes generation
and transmission and links to further detailed
worksheets.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.allaboutcircuits.com/vol_2/chpt_1/1.html
12
Cambridge
TECHNICALS
Resources Link
The AC Waveform
Description:
An introduction to the theory of the AC waveform –
including amplitude, frequency and periodic time.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/accircuits/ac-waveform.html
13
Cambridge
TECHNICALS
Resources Link
Phase Difference and Phase Shift
Description:
An introduction to the concept of phase and phase
angle in AC circuits. Explains how to construct
phasor diagrams.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/accircuits/phase-difference.html
14
Cambridge
TECHNICALS
Resources Link
AC circuits: alternating current electricity
Description:
An introduction to AC theory including the
behaviour of inductors and capacitors in AC circuits.
Has some useful animated graphics illustrating
phase difference.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.animations.physics.unsw.edu.au//jw/AC.html
15
Cambridge
TECHNICALS
Resources Link
Resistors, capacitors and inductors in AC circuits
Description:
An introduction to the behaviour of resistors,
inductors and capacitors in AC circuits, including
phasor diagrams. 12 page PDF including diagrams.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Online PDF
http://www.physics.ryerson.ca/sites/default/files/u11/guidelines/L5_
RLC_Circuits.pdf
16
Cambridge
TECHNICALS
Resources Link
Power Factor
Description:
Tutorial covering power factor in AC circuits.
Includes detailed explanation and worked
examples.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.allaboutcircuits.com/vol_2/chpt_11/3.html
17
Cambridge
TECHNICALS
Resources Link
Filters (low and high pass)
Description:
Tutorials explaining the function and application of
low and high pass filters. Includes worked examples.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/filter/filter_2.html
18
Cambridge
TECHNICALS
Resources Link
Battery types
Description:
An explanation of the features and characteristics of
different types of batteries.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://batteryuniversity.com/learn/article/whats_the_best_battery
19
Cambridge
TECHNICALS
Resources Link
Solar (PV) Cells
Description:
Website dedicated to solar photo-voltaic (PV) cell
education. Includes detailed explanation of how
solar cells work.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://pveducation.org/pvcdrom/solar-cell-operation/solar-cell-structure
20
Cambridge
TECHNICALS
Resources Link
Rectifier circuits
Description:
A full explanation of the function and application of
a range of DC diode rectifier circuits.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.allaboutcircuits.com/vol_3/chpt_3/4.html
21
Cambridge
TECHNICALS
Resources Link
Voltage regulators
Description:
A basic introduction to voltage regulators and
power supplies. Includes a block diagram.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electrical4u.com/regulated-power-supply/
22
Cambridge
TECHNICALS
Resources Link
Power supplies and load regulation
Description:
Explain the function and operation of stabilised
power supplies, including load regulation.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Online PDF
http://www.talkingelectronics.com/Download%20eBooks/Principles%20
of%20electronics/CH-17.pdf
23
Cambridge
TECHNICALS
Resources Link
Fuses and circuit breakers
Description:
A basic introduction to fuses. Also includes
discussion about circuit breakers and other forms of
circuit protection.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.allaboutcircuits.com/vol_1/chpt_12/4.html
24
Cambridge
TECHNICALS
Resources Link
Diodes (circuit protection)
Description:
Explains how diodes can be used to protect a
circuit.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://jeelabs.org/2011/01/09/easy-electrons-%E2%80%93-diodes/
25
Cambridge
TECHNICALS
Resources Link
Transformer basics
Description:
A basic introduction to transformers. Includes
voltage, current and turns ratio.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/transformer/transformer-basics.html
26
Cambridge
TECHNICALS
Resources Link
Faraday’s Law
Description:
A tutorial explaining Faraday’s Law. Includes
practical experiments that could be performed.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://electrical4u.com/faraday-law-of-electromagnetic-induction/
27
Cambridge
TECHNICALS
Resources Link
Lenz’s Law
Description:
A tutorial explanation of Lenz’s Law.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://electrical4u.com/lenz-law-of-electromagnetic-induction/
28
Cambridge
TECHNICALS
Resources Link
Electric motors and generators (introduction)
Description:
An introduction to how DC motors and generators
work. Includes animated diagrams.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.animations.physics.unsw.edu.au/jw/electricmotors.html
29
Cambridge
TECHNICALS
Resources Link
DC motor types (series and shunt)
Description:
An explanation of the different types of DC motor –
including series and shunt types.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://electrical4u.com/types-of-dc-motor-separately-excited-shuntseries-compound-dc-motor/
30
Cambridge
TECHNICALS
Resources Link
Motors (AC and DC)
Description:
Website with comprehensive explanation of AC and DC
motor types. Includes videos of motors in operation.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.edisontechcenter.org/electricmotors.html
31
Cambridge
TECHNICALS
Resources Link
Electromagnetic Compatibility
Description:
Series of web pages explaining electromagnetic
compatibility (EMC) and how it can be mitigated
against. Ofcom website.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://ofcom.org.uk/static/archive/ra/topics/research/RAwebPages/
Radiocomms/index.htm
32
Cambridge
TECHNICALS
Resources Link
EMC and legislation
Description:
Website explaining EMC and legislation.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.ukqrm.org.uk/legislation.php
33
Cambridge
TECHNICALS
Resources Link
System diagrams (basic introduction)
Description:
A basic introduction to system diagrams.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.bbc.co.uk/schools/gcsebitesize/design/electronics/
industrial_designrev2.shtml
34
Cambridge
TECHNICALS
Resources Link
Open and Closed loop systems and block diagrams
Description:
Website explaining open and closed loop systems,
including inputs, outputs and feedback.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/systems/open-loop-system.html
35
Cambridge
TECHNICALS
Resources Link
Block Diagrams
Description:
Tutorial explaining the use of block diagrams for
describing electrical and electronic systems.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.hobbyprojects.com/block_diagrams/block_diagrams.html
36
Cambridge
TECHNICALS
Resources Link
Sensors and Transducers
Description:
Tutorial covering sensors and transducers (input
devices) and actuators (output devices).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/io/io_1.html
37
Cambridge
TECHNICALS
Resources Link
7-segment LED displays
Description:
Tutorial about LED displays (output devices). Website
also includes tutorials about other output devices.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html
38
Cambridge
TECHNICALS
Resources Link
Diodes
Description:
A basic introduction to the diode. Includes an
explanation of circuit protection using diodes, and also
zener diodes.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.technologystudent.com/elec1/diode1.htm
39
Cambridge
TECHNICALS
Resources Link
Transistors (switch)
Description:
An explanation of how a transistor can be used as a
switch.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/transistor/tran_4.html
40
Cambridge
TECHNICALS
Resources Link
Transistor (common emitter amplifier)
Description:
An explanation of how a transistor can be used as a
common emitter amplifier.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.allaboutcircuits.com/vol_3/chpt_4/5.html
41
Cambridge
TECHNICALS
Resources Link
Darlington Pair
Description:
A simple explanation of the Darlington pair transistor.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.technologystudent.com/elec1/transis2.htm
42
Cambridge
TECHNICALS
Resources Link
Op Amps
Description:
A series of video tutorials introducing the characteristics,
configuration and operation of op-amps.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page with video tutorials
http://www.allaboutcircuits.com/videos/73.html
43
Cambridge
TECHNICALS
Resources Link
Op Amps – comparator
Description:
A tutorial explaining the function of op amps, including
the op amp comparator.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/opamp/op-amp-building-blocks.html
44
Cambridge
TECHNICALS
Resources Link
The summing op-amp
Description:
A tutorial about the summing op-amp. Includes
characteristic equations.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/opamp/opamp_4.html
45
Cambridge
TECHNICALS
Resources Link
Online circuit simulator
Description:
Free online simulation package. Includes inverting,
non-inverting and summing op-amps. Can perform
simulation of other circuits, including digital circuits and
flip flops.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free, but requires setup of login. Some limitations
in free version.
Format:
Web page – online simulation tool
https://www.circuitlab.com/circuit/mrp5kc/op-amp-inverting-summingamplifier/
46
Cambridge
TECHNICALS
Resources Link
Online op-amp simulator (from Texas Instruments)
Description:
Online simulation tool includes inverting and noninverting op-amps.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page – simulation tool
http://www.ti.com/lsds/ti/analog/webench/amplifiers.page
47
Cambridge
TECHNICALS
Resources Link
Introduction to digital logic gates
Description:
Complete set of tutorials covering digital logic gates and
types.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/logic/logic_1.html
48
Cambridge
TECHNICALS
Resources Link
Logic gate truth tables
Description:
A tutorial about logic gate truth tables. Also has an
introduction to Boolean algebra and expressions.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/boolean/bool_7.html
http://www.technologystudent.com/elec1/diode1.htm
49
Cambridge
TECHNICALS
Resources Link
Online logic simulator
Description:
Online logic simulator. Includes most popular logic
gates and flip flops. Combinational circuits can be
constructed and tested.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page – online simulation
http://www.neuroproductions.be/logic-lab/
50
Cambridge
TECHNICALS
Resources Link
Basic flip flops
Description:
An introduction to the four main type of flip flop –
including D and T types. Begins with an explanation
of the S-R flip flop (using NOR and NAND gates).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.circuitstoday.com/flip-flops
http://www.technologystudent.com/elec1/diode1.htm
51
Cambridge
TECHNICALS
Resources Link
The D-Type flip flop
Description:
An introduction to the operation of the D-type flip
flop.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/sequential/seq_4.html
http://www.technologystudent.com/elec1/diode1.htm
52
Cambridge
TECHNICALS
Resources Link
JK and T type flip flops
Description:
Explanation of the operation of the JK and T type
flip flop. Includes circuit diagrams and truth tables.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.technologystudent.com/elec1/diode1.htm
http://www.brighthubengineering.com/diy-electronics-devices/46610jk-and-t-flip-flops/#imgn_1
53
Cambridge
TECHNICALS
Resources Link
Online simulation software
Description:
Online simulation software. Includes simulation of
analogue and digital circuits. Can also simulate flip
flops.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free (but requires login). Free version limited to
circuits with 10 components.
Format:
Online simulation tool
http://www.docircuits.com/public-circuit/457/d-flipflop
http://www.technologystudent.com/elec1/diode1.htm
54
Cambridge
TECHNICALS
Resources Link
BCD Counter
Description:
An explanation of how a BCD counter works.
Describes the circuit for the BCD counter using JK
flip flops.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/counter/bcd-counter-circuit.html
http://www.technologystudent.com/elec1/diode1.htm
55
Cambridge
TECHNICALS
Resources Link
Display Decoder
Description:
A description of a display decoder from BCD to
7-segment.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/combination/comb_6.html
http://www.technologystudent.com/elec1/diode1.htm
56
Cambridge
TECHNICALS
Resources Link
Data sheets online
Description:
An introduction to the four main type of flip flop –
including D and T types. Begins with an explanation
of the S-R flip flop (using NOR and NAND gates).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.electronics-tutorials.ws/logic/logic_1.html
http://www.technologystudent.com/elec1/diode1.htm
57
Cambridge
TECHNICALS
Resources Link
Embedded systems – application of programmable
devices
Description:
A basic introduction to embedded systems (i.e.
systems using a programmable device such as a
microprocessor or microcontroller).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.engineersgarage.com/articles/embedded-systems
http://www.technologystudent.com/elec1/diode1.htm
58
Cambridge
TECHNICALS
Resources Link
Microprocessors and Microcontrollers
Description:
A thorough video introduction to microcontrollers
and comparison with microprocessors.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
YouTube video
http://www.youtube.com/watch?v=CmvUY4S0UbI
59
Cambridge
TECHNICALS
Resources Link
Programmable Interface Controller (PIC)
Description:
An introduction to programmable interface
controllers (PICs).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.circuitstoday.com/peripheral-interface-controller-pic
http://www.technologystudent.com/elec1/diode1.htm
60
Cambridge
TECHNICALS
Resources Link
Programmable Logic Controller (PLC)
Description:
An introduction to programmable logic controllers
(PLCs).
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.allaboutcircuits.com/vol_4/chpt_6/6.html
http://www.technologystudent.com/elec1/diode1.htm
61
Cambridge
TECHNICALS
Resources Link
System layouts for programmable devices – the
microwave oven
Description:
Texas Instruments website with an example of an
embedded system for a microwave oven. Website
also includes system layouts and analysis of more
embedded systems.
Supports:
OCR Cambridge Technicals in Engineering Level 3
Unit 5
Cost:
Free
Format:
Web page
http://www.ti.com/solution/microwave_oven
http://www.technologystudent.com/elec1/diode1.htm
62
Cambridge
TECHNICALS
Resources Link
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Cambridge
TECHNICALS
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