1 Ağustos 2010 Pazar

Ücretsiz PCB Çizim Programları

PCB Here's a PCB design tools list you can download, and more resource for comparing which one
software you can choose to use. Get freeware and open source
PCB


    • http://www.cadsoft.de/"
    • ;EAGLE - Nice, easy to use CAD/CAM software for 
    •  PCB schematic and routing">PCB schematic and routing. You can download free evaluation version

  • TinyCAD is a free open-source schematic editor written by Matt Pyne.




  • http://www.freepcb.com/"

  • FREE-PCB -FreePCB is a free, open-source 

  • printed circuit board layout editor for Microsoft Windows!




  • http://geda.seul.org/"

  • gEDA is a free, open-source schematic capture and layout package that runs on Linux.




  • http://www.zenitpcb.com/"

  • ZenitPCB is a freeware layout software.




  • http://bach.ece.jhu.edu/%7Ehaceaton/pcb/index.html

  • PCB - Free unix PCB editor.




  • http://www.lis.inpg.fr/realise_au_lis/kicad/

  • KICAD -GPL open source schematic capture and PCB routing.




  • http://b.urbani.free.fr/

  • TCI3 -Free PCB routing and schematic capture software.





  • http://members.ol.com.au/score/

  • SCORE - Free schematic capture software (Alfa version).




  • http://www.protel.com/"

  • ;PROTEL - CAD/CAM software for schematic and routing. You can download 30 days free trial. Protel offers free old-DOS based software called EasyTrax. 




  • "http://www.suigyodo.com/online/e/index.htm"

  • MINIMAL PCB EDITOR - Open source schematic capture and board layout editor for windows by OKADA Hitoshi



  • http://www.olimex.com/pcb/dtools.html"
    freeware and open source PCB Design ToolsMore source for freeware and open source PCB Design Tools
    See more:
    http://printedboardcircuit.blogspot.com/2008/06/printed-circuit-board-software.html"
    Printed Circuit Board Software - WinCircuit 2008
    Printed Circuit Board Software - WinCircuit 2008
    printedboardcircuit , dan alıntıdır .siteye emeği geçenlere teşekkür ederim

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    İzleyiciler

    LED DİRENÇ HESAPLAMA

    All LEDs require current limiting, without a current limiting mechanism the LED will usually burn out in under a second. Adding a simple resistor is the easiest way to limit the current. Use the calculator below to find out the value of resistor you require.

    For example if you are wanting to power one of our_blank">red LEDs in an automotive application you would see that the typical forward voltage is 2.0 Volts and the maximum continuous forward current is 30mA. Therefore you would enter 14.5, 2.0 and 30 into the Single LED calculation box. After calculating you get 470ohm 1 watt as the result. Here is a that allows you to enter a resistor value and generate the corresponding color code.

    Note: For automotive applications use the actual system voltage, not 12 Volts. Most 12 Volt system actually operate at around 14.5 Volts.

    Supply Voltage
    VOLTS
    Voltage Drop Across LED
    VOLTS
    Desired LED Current
    MILLIAMPS



    Calculated Limiting Resistor
    OHMS
    Nearest higher rated 10% resistor

    Calculated Resistor Wattage
    WATTS
    Safe pick is a resistor with
    power rating of (common values are .25W, .5W, and 1W)
    WATTS

    LEDs in series

    Several leds in series with one resistor
    Supply Voltage
    VOLTS
    Voltage Drop Across LED
    VOLTS
    Desired LED Current
    MILLIAMPS
    How many LEDs connected




    Calculated Limiting Resistor
    OHMS
    Nearest higher rated 10% resistor

    Calculated Resistor Wattage
    WATTS
    Safe pick is a resistor with
    power rating of (common values are .25W, .5W, and 1W)
    WATTS
    LM317 UYGULAMA DEVRELERİ HESAPLAMASI

     




    Çıkış Voltajı
    R1 resistor

    R2 resistor

    R1 resistor
    R2 resistor

    Çıkış Voltajı


    Lm317 uygulama devreleri ve detayli bilgiye Buradan ulasabilirsiniz

    LM555 - ASTABLE OSCILLATOR CALCULATOR

    LM555 - ASTABLE OSCILLATOR CALCULATOR
    Value Of R1 Ohms Value Of R2 Ohms
    Value Of C1 Microfarads
    Output Time HIGH SECONDS Output Time LOW SECONDS Output Period HIGH + LOW SECONDS Output Frequency HERTZ Output Duty Cycle PERCENT
    Resistor values are in Ohms (1K = 1000) - Capacitor values are in Microfarads (1uF = 1)

    NOTE: The leakage currents of electrolytic capacitors will affect the actual output results of the timers. To compensate for leakage it is often better to use a higher value capacitor and lower value resistances in the timer circuits.

    LM555 Astable Oscillator Circuit Diagram


    LM555 - ASTABLE CAPACITOR CALCULATOR

    The next calculator can find the capacitance needed for a particular output frequency if the values of R1 and R2 are known.

    Value Of R1 Ohms Value Of R2 Ohms
    Frequency Desired Hertz
    Capacitance uF
    s

    VOLT AMPER OHM ve WATT HESAPLAMA

    Current:
    kA (kiloamps) A (amps) mA (milliamps) µA (microamps)
    Voltage:
    kV (kilovolts) V (volts) mV (millivolts) µV (microvolts)