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    circuit diagrams,circuit diagram,PCB diagram,electronic circuits diagram,Electronic schematics diagrams,China
    This site contains lots of FREE electronic circuits (schematics) & doityourself (DIY) circuit diagrams for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few. There are also links to sites that offer hobby electronic kits and other electronics hobby related stuff. Use the menu on the left to browse different circuit categories. You can view the entire electronic circuit schematics index by clicking here.
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    The information presented on this site is primarily intended as a source of reference to engineers, repairmen, and hobbyists. Most of the projects are given a brief description regarding its operation and hence a person with elementary knowledge in electronics can easily understand its operation.

    Before using information on this website please read the disclaimer. 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.

    Drawing circuit diagrams the 'electronics way'
    Circuit diagrams for electronics are drawn with the positive (+) supply at the top and the negative () supply at the bottom. This can be helpful in understanding the operation of the circuit because the voltage decreases as you move down the circuit diagram.
    Circuit diagrams for science are traditionally drawn with the battery or power supply at the top. This is not wrong, but there is usually no advantage in drawing them this way and I think it is less helpful for understanding the circuit.

    I suggest that you always draw your circuit diagrams the 'electronics way', even for science!

    [I hope your science teacher won't mind too much!]

    Note that the negative supply is usually called 0V (zero volts).
    This is explained on the Voltage and Current page.

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    Contemporary Computer, Electronics and Science Projects choosen by our editors.

    Nokia 6280 with SLR optics
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    Added on Nov 19, 2007
    Replace a mini USB port on your cellphone
    At some point, just about everyone manages to mess up their precious electronics. In this case, someone (not me) somehow managed to totally demolish the mini USB port in their new Motorola cell phone. Surface mount repairs can be challenging without some serious tools, but it\'s possible to replace parts without a rework station.燞ere is how to do that with some fairly inexpensive tools.
    Added on Nov 19, 2007
    Identifying Electronic Components
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    Added on Nov 19, 2007
    Adding Internal USB (and internal ReadyBoost) to a UMPC
    Identify the interface and pins on the internal USB port. Find a USB hub that will physically fit into the eo. Find a fast flash drive that will also fit. Cut and wire the internal USB port to talk to the hub. Wire a port on the hub to manage the WiFi or Bluetooth module. Get it all to actually fit.
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    DIY laser longdistance listening device
    The following project will show how you can use a laser pointer to hear noises from hundreds of feet away (the distance will be relative to the strength of the laser).
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    How to Upgrade the Creative Zen Vision W Hard Drive
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    in All Sections Top PicksAll ProjectsNew Gadgets

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    Fix that stupid USB connector
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    Added on Nov 19, 2007
    Accelerometer Based Mouse
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    GP2X built in USB host port
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    Simple Parallel (Printer) Port Interface
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    Added on Jul 21, 2007
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    The chronograph works in the normal way, by timing how long it takes a projectile to break two infrared beams spaced 3 inches apart in the tube. The spacing is critical as any offset will result in a measurement error. The minimum measurable projectile speed is approximately 38.1 ft/sec.
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    Added on Nov 19, 2007
    Electric LEGO Motor II
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    The high performance SMD headphone
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    New in
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    Added on Jul 18, 2007
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    Added on Jul 18, 2007
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    Video through the microscope
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    Added on Jul 18, 2007
    Listening to Electric Fish
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    Added on Jul 18, 2007
    Building the impossible kaleidoscope
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    Added on Jul 16, 2007
    Building a simple spectroscope
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    Make a permanent rainbow
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    V. Ryan ? 2002

    Below is an example of a 555 monostable timer circuit. When a circuit is designed it is first drawn on a piece of software that allows the components to be set out in the circuit. Software such as 'Crocodile Clips' is ideal for school use as it allows each component to be moved around the screen and testing of the circuit once it is complete. Once complete as a working circuit diagram it must then be converted into a printed circuit board layout (PCB). Normally the completed circuit diagram is imported into a second piece of software such as PCB Wizard which converts the diagram automatically.
    Left is the monostable circuit drawn as a circuit diagram. Circuit diagrams are often easier to understand and follow. Some of the components have been labelled. If you compare the circuit diagram with the printed circuit board version (below it) one of the main differences is the numbering of the pins of the 555 IC. On a PCB these are always in order but this is not always the case for the circuit diagrams.

    The PCB layout is set out in a slightly different way as the tracks are set in a more efficient layout, which saves space and expensive printed circuit board.

    The animation (below) displays each stage of drawing a PCB layout for the circuit diagram.Narrow Your Search
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    Posts: 1
    From: M'sia
    17 Jan 2003 1:35 PM
    Hi all,

    Searching for handphone circuit diagram and the PCB diagram. Does anyone have any idea where to get this cheaply If possible, with repair notes.




    Reply Quote

    Posts: 1
    From: London
    27 Jan 2003 4:24 PM

    I have this high resolution Pcb Diagram for you £10 pounds and just email me if you want the product , Kewl ...

    JE (mrtzx)

    Reply Quote

    Posts: 1
    From: ITN MALANG
    30 Apr 2003 10:57 PM

    Reply Quote

    George Anthony Kermeen.
    Posts: 1
    From: Dudley Designs And Technical Services
    24 Jun 2003 9:58 PM


    Have you got a circuit diagram, parts list service manual etc for a Motorola C520 mobile telephone please. I need to operate the keys with relays or analogue switches controlled by a microcomputer if possible and may be read the LCD message bus to access text messages if possible using a microcomputer. We would be very grateful for any help and advice to be able to achieve this please.

    Best Regards



    Reply Quote

    Posts: 1
    From: Bangladesh
    23 Jul 2003 10:33 AM
    dear Sir,

    I am from bangladesh. I am searching circuit diagram of mobile phone. I am providing servicing facility in my country. pls help me!!!! i am

    M. Sc. in applied physics & Electronics.

    best regard.

    yours faihfully


    Reply Quote

    Posts: 1
    From: Bangladesh
    20 Oct 2003 10:09 AM

    I wanna get circuit diagram of cellphone. Pls send or give information about that.



    Reply Quote

    Posts: 1
    From: India
    9 Feb 2004 9:09 AM

    Originally posted by mailtopang. on 17 Jan 2003 1:35 PM
    Hi all,
    Searching for handphone circuit diagram and the PCB diagram. Does anyone have any idea where to get this cheaply If possible, with repair notes.

    Reply Quote

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    Using Schematic Diagrams

    Because different electronic components have different characteristics, it is necessary to distinguish between them in any circuit diagram. Of course, we could use the block diagram approach, and just identify each component with words. Unfortunately, this takes up a lot of space and makes the overall diagram harder to recognize or understand quickly. We need a way to understand electrical diagrams far more quickly and easily.

    The answer is to use schematic symbols to represent electronic components, as shown in the diagram to the right. In this diagram, we show the schematic symbol of a battery as the electrical source, and the symbol of a resistor as the load. Even without the words and arrows, the symbols define exactly what this circuit is and how it behaves.

    The symbol for each electronic component is suggestive of the behavior of that component. Thus, the battery symbol above consists of multiple individual cells connected in series. By convention, the longer line represents the positive terminal of each cell. The battery voltage would normally be specified next to the symbol.

    The zigzag line represents any resistor. In most cases, its resistance is specified next to the symbol just as the battery voltage would be given. It is easier and faster to read the symbol and the legend "4.7k" next to it, than to see a box and have to read "4700ohm resistor" inside it.

    As we introduce various electronic components in these pages, we will provide their schematic symbols as well.

    One of the problems that can occur with schematic diagrams is too many lines all over the page. It's not a big deal when there are only two components in the circuit, but think of what the complete diagram for a modern television receiver or even a radio receiver would look like. We need a way to reduce the number of lines showing electrical connections.

    We can help reduce the problem by noting that one connection is common to all circuitry, and serves as the reference point from which all electrical measurements are made. This electrical connection is designated the "ground reference," or simply "ground," in the circuit. The modified schematic diagram is shown to the right.

    This circuit is actually the same as the one above, with the voltage source designated "E" (for EMF or ElectroMotive Force) and the load designated "R" (for Resistance). The ground symbols ( ) are assumed to be electrically connected to each other without any explicit connection shown. Often a circuit will be constructed on a steel or aluminum chassis, in which case the chassis itself is commonly used as the electrical ground as well as the mechanical support for the circuitry.
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