Unlike a block diagram or layout diagram, a circuit diagram shows the actual wire connections being used. The diagram does not show the physical arrangement of components. A drawing meant to depict what the circuit actually looks like is called "artwork" or "layout".

Circuit diagrams are used for the design (circuit design), construction (such as PCB layout), and maintenance of electrical and electronic equipment.

Contents [hide]
1 Legends
2 Symbols
2.1 Standards
2.2 Linkages
3 European and Australian codes
4 Organization of drawings
5 Art Work
6 See also
7 External links

[edit] Legends

Common circuit diagram symbols (with US Resistor Symbol)On a circuit diagram, the symbols for components are labelled with a descriptor (or reference designator) matching that on the list of parts. For example, C1 is the first
ANSI standard Y32 (also known as IEEE Std 315)
IEC 60617 originally consisted of 13 parts, from resistors and capacitors to logic symbols and even a generalised drawing standard of connections and bus line widths. It is now published as a subscription online database IEC 60617-DB [1].

Different symbols may be used depending on the discipline using the drawing; for example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics.

[edit] Linkages

Schematic wire junctions:
1. Old style: (a) connection, (b) no connection.
2. One CAD style: (a) connection, (b) no connection.
3. Alternative CAD Style: (a) connection, (b) no connection.The linkages between leads were once simple crossings of lines; one wire insulated from and "jumping over" another was indicated by it making a little semicircle over the other line. With the arrival of computerized drafting, a connection of two intersecting wires was shown by a crossing with a dot or "blob", and a crossover of insulated wires by a simple crossing without a dot. However, there was a danger of confusing these two representations if the dot was drawn too small or omitted. Modern practice is to avoid using the "crossover with dot" symbol, and to draw the wires meeting at two points instead of one. It is also common to use a hybrid style, showing connections as a cross with a dot while insulated crossings use the semicircle.
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RAD Hard Line
M.S. Kennedy Corp.

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FSP TECHNOLOGY INC.
PC Power Supply: FSP300-60GLN(80)
FSP Technology, the sixth largest power supply vendor in the world, offers the FSP300-60GLN(80), an 80 Plus Certified PC power supply unit that features high efficiency coupled with both low ripple and low noise output. The FSP300-60GLN(80) also features resettable power shut down, and over voltage and short circuit protection. (read more)

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FSP TECHNOLOGY INC.
PC Power Supply: FSP300-60GLS(80)
FSP Technology, the sixth largest power supply vendor in the world, offers the FSP300-60GLS(80), a 300 Watt PC power supply unit that features high efficiency coupled with both low ripple and low noise output and an 8 cm fan. The FSP300-60GLN(80) also features resettable power shut down, and over voltage and short circuit protection. (read more)

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FSP TECHNOLOGY INC.
PC Power Supply:FSP250-60SPV
FSP Technology, the sixth largest power supply vendor in the world, offers the FSP250-60SPV. (read more)

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FranMar International
250~910 W IPC power supply
250~910 W, 6 output
Redundant power system with on line
Hot-swap and hot-plug function (read more)

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Kikusui America, Inc.
Variable-switching Multi Range DC Power Supply
Outline

The PWR Series offers constant voltage (CV)/constant current (CC) automatic crossover DC power supplies that enable you to combine a wide range of voltages and currents within the output power rating. For example, the model that has an output power rating of 1600W (PWR1600L) provides a seamless operation range from 80 V - 20 A to 16V - 100A. With a single PWR Series power supp... (read more)

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Control Resources, Inc.
15 VDC Dual Power Supply
Control Resources Introduces New 15 VDC Dual Power Supply

Control Resources’ LabPower DS1501 is a benchtop power supply intended for convenient powering of small digital and analog circuits. (read more)

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High Voltage Power Solutions, Inc.
Open Board High Voltage Power Supply
The CS2211 series of regulated solid state switching power supplies is designed for electrostatic air cleaning equipment and other equipment requiring reliable, compact, economical high voltage (5kVDC and above) power supplies. (read more)

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Xenon Corporation
PWB Curing Systems Penetrates Multi-Film Circuits
A new, mercury-free, PWB (printed wiring board) curing system that employs pulsed UV to cure multi-film flexible circuit boards without damage is being introduced by Xenon Corporation of Woburn, Massachusetts. (read more)

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Simple 5V power supply for digital circuits

Summary of circuit features
Brief description of operation: Gives out well regulated +5V output, output current capability of 100 mA
Circuit protection: Built-in overheating protection shuts down output when regulator IC gets too hot
Circuit complexity: Very simple and easy to build
Circuit performance: Very stable +5V output voltage, reliable operation
Pinout of the 7805 regulator IC. Circuit Diagrams
Next Page: Circuit Symbols
Also see: Block Diagrams

Circuit diagrams show how electronic components are connected together. Each component is represented by a symbol and a few are shown here, for other symbols please see the Circuit Symbols page.

Circuit diagrams and component layouts
Circuit diagrams show the connections as clearly as possible with all wires drawn neatly as straight lines. The actual layout of the components is usually quite different from the circuit diagram and this can be confusing for the beginner. The secret is to concentrate on the connections, not the actual positions of components.
The circuit diagram and stripboard layout for the Adjustable Timer project are shown here so you can see the difference.

A circuit diagram is useful when testing a circuit and for understanding how it works. This is why the instructions for projects include a circuit diagram as well as the stripboard or printed circuit board layout which you need to build the circuit.

Drawing circuit diagrams
Drawing circuit diagrams is not difficult but it takes a little practice to draw neat, clear diagrams. This is a useful skill for science as well as for electronics. You will certainly need to draw circuit diagrams if you design your own circuits.
Follow these tips for best results:

Make sure you use the correct symbol for each component.
Draw connecting wires as straight lines (use a ruler).
Put a 'blob' () at each junction between wires.
Label components such as resistors and capacitors with their values.
The positive (+) supply should be at the top and the negative (-) supply at the bottom. The negative supply is usually labelled 0V, zero volts.
If you are drawing the circuit diagram for science please see the section about drawing diagrams the 'electronics way'.
If the circuit is complex:
Try to arrange the diagram so that signals flow from left to right: inputs and controls should be on the left, outputs on the right.
You may omit the battery or power supply symbols, but you must include (and label) the supply lines at the top and bottom.

1. Unregulated voltage in
2. Ground
3. Regulated voltage out Design and Construction of a Remote Controlled Power Supply Unit

Mahmud Shehu AHMED, Murtala B. Z. ADAMU, Jonathan G. KOLO

Department of Electrical and Computer Engineering, Federal University of Technology, Nigeria

Mahmud_ahmed134@yahoo.com.uk, adamsmurtala@yahoo.com, jgkolo@gmail.com

Abstract

The paper presents the design and construction of an infrared remote controlled power supply-switching unit, which is a device that enables the user to operate or control the mains power supplied from approximately 5 to 10 meters away. The remote transmits a beam of light using an infrared light emitting diode; this light is picked and decoded by the receiver unit (Photodiode). The receiver only activates when it receives the beam of light, there are no accidental activations. The system was broken down into simpler functional parts namely: The transmitter stage, the detector (phototransistor) stage, the NAND Schmitt trigger stage, the flip-flop stage and the relay stage. Details of the stages are described in the paper.

Keywords

Transmitter, Infrared, Control, Device, Design

Introduction

With the advancement in technology, new electrical protective devices with various levels of complexity have been designed, and different failures from these systems have been recorded. The design and construction of a reliable cost effective protective device, “the remotely controlled power supply switching unit」 is to be used in collaboration with some other forms of protective devices (circuits breakers and fuses). The primary aim of this work is to design a simple cost effective and reliable circuit (protective system), which will aid in- protecting electrical and electronic devices in our homes and offices with ease.

Basically, a remote control operates in the following manner. A button is pressed; this completes a specific comprises of a transmitter designed to generate an average frequency from 30 KHz to 60 KHz. [9]. The frequency rate of the output pulse is determined by the values of two resistors “R1 and R2」 and the timing capacitor “C of the 555 timer [8]. The signal generated by the timer is picked up by the infrared detector unit, which goes low on receiving the signal [2]. The detector unit (photodiode) is set by different values of “R1」 and “C1」and the values for the resistor “R1」 may be as high as 10Kohms and the capacitor C1 40屘F. This will prevent the photodiode unit from turning on under normal lighting conditions [8]. The output of the photodiode, which is at low level, is then inverted by the NAND Schmitt trigger, (the NAND gate is a NOT -AND, or an inverted AND function)[3]. The NAND gate used for this project is the CB 4093 BCN, the output of the NAND gate (a high) is now fed to into the flip flop which is a D – type of flip flop and it stores the information it receives which is a high (i.e.1), until it receives a contrary command or information which may be a low (i.e.0) when the transmitter button is pressed again [3,5]. The flip-flop receives data or information, which is a single bit and stores it; the data may be a low or high depending on the input. The output of the flip-flop now turns on or triggers the relay, which supplies power to the AC supply line. The flip-flop used for this work is the TC 4013 BP as shown in circuit diagram of Figure 4. The relay acts as a switch and as an isolator in this work because it is used to isolate the main circuit from the AC supply line, and it switches the power supply of a given room ON or OFF as the case may be.

Component list
7805 regulator IC
100 uF electrolytic capacitor, at least 25V voltage rating
10 uF electrolytic capacitor, at least 6V voltage rating
100 nF ceramic or polyester capacitor

UltraVolt, Inc.
"HV Rack"? Rack Mount HV Power Supply System
The "HV Rack"? line of rack-mount power supplies can be configured with up to 4 channels, each at 0 to 62V through 0 to 40kV and from 4 watts to 250 watts. Each channel can be independently controlled with local and remote controls. (read more)

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Carlo Gavazzi Computing Solutions
786 Series Rugged Industrial PC Platform
Rugged industrial pc platform available with SBC, I/O, and expansion. (read more)

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[edit] European and Australian codes
To comply with Wikipedia's quality standards, this section may need to be rewritten.
Please help improve this article. The discussion page may contain suggestions.

The following codes which vary slightly from the American codes are in common use in European and Australian standard electrical circuit diagrams. These codes are used for the "reference designators" printed on PCBs (which match the corresponding ones written on the corresponding schematic).

A: Assemblies
B: Transducers (photo cells, inductive proximity, thermocouple, flame detection)
C: Capacitors
D: Storage devices
E: Miscellaneous
F: Fuses
G: Generator, battery pack
H: Indicators, lamps (not for illumination), signalling devices
K: Relays, contactors
L: Inductors and filters
M: Motors
N: Analogue devices
P: Measuring/test equipment
Q: Circuit breakers, isolators, re-closers
R: Resistors, brake resistors
S: Switches, push buttons, emergency stops and limit switches
T: Transformers
U: Power converters, variable speed drives, soft starters, DC power supplies
V: Semiconductors
W: Wires, conductors, power, neutral and earthing busses
X: Terminal strips, terminations, joins
Y: Solenoids, electrical actuators
Z: Filters
Detailed rules for reference designations are provided in the International standard IEC 61346.

[edit] Organization of drawings
It is a usual although not universal convention that schematic drawings are organized on the page from left to right and top to bottom in the same sequence as the flow of the main signal or power path. For example, a schematic for a radio receiver might start with the antenna input at the left of the page and end with the loudspeaker at the right. Positive power supply connections for each stage would be shown towards the top of the page, with grounds, negative supplies, or other return paths towards the bottom. Schematic drawings intended for maintenance may

A generalized design flow would be as: Schematic -> Schematic Capture -> Rat's Nest -> Routing ->Art Work -> PCB Development & etching -> Component Mounting -> Testing.

[edit] See also
Electronics portal
AutoTRAX EDA a multiplatform schematic capture, SPICE simulator and PCB designer.
Kicad a GPL-ed EDA-Tool used for schematic circuit and PCB design.
gEDA, a GNU EDA-Tool used for schematic circuit design.
Schematic capture
Schematic editor
The schematic typically shows the pinout of each part.
Electronic symbol
OrCAD or Eagle (program) Software for electronic schematics and for manufacture of printed circuit boards.
Edwinxp – Totally Integrated Schematic Capture, Simulation Software and PCB design.
Multisim Electronic schematic capture and simulation software Hobby Electronic Kits

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Fm: Radio Circuit Diagram

FM Transmitter and FM Radio Transmitters, 3 Volt FM Transmitter
The most powerful circuit we've seen that operates on such low voltage (just two AA cells). A range of 100 meters can be expected and, given a good antenna and FM receiver, 500 meters can be expected. An external power supply can be used up to 9 volts. Tr
SUPRX High Performance FM Radio Receiver
4 Comments - in Radio Receivers
Schematic, circuit design and comprehensive details about a SUPRX FM radio receiver, featuring high sensitivity
Auto Scan FM Radio Box / Kit
FM Radio Receiver Box Kit with Auto-Scan Function.
5 Watt PLL FM Transmitter (Early Dutch Radio JukeBox)
1 Comment - in FM Transmitters
Interesting, hand-drawn schematic for a PLL FM Stereo Transmitter, with approximately 5 Watts RF output power.
Active AM Radio Antenna Amplifier / Preamplifier
0 Comments - in Radio Receivers
Circuit diagram for an AM radio antenna preamplifier that amplifiers the signal before it get to the AM receiver, thus making the AM radio signals stronger for better reception.
FM Transmitter kit with microphone (Wireless Mic) Free Circuit DiagramHome
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