Amplifier, Infrared Remote and other projects

Discussion in 'Homework Help' started by Xufyan, Aug 3, 2010.

  1. Xufyan

    Thread Starter Member

    Aug 3, 2010
    114
    0
    1. The problem statement, all variables and given/known data

    for what purpose dodes are used in these projects.

    I want to search those devices and projects in which diodes are use.
    i have found six of them and found some incomplete information (without purpose of diode)
    here are the projects,


    http://www.electronickits.com/kit/co...lec/ck1600.htm
    http://www.electronics-project-desig...orControl.html
    http://www.electronics-project-desig...r-Circuit.html
    http://www.electronics-project-desig...Amplifier.html



    Efforts.
    I am searching a lot for the purpose of diode in these projects for last 4 daysbut didn't find.
    i've found the purpose of diode in these projects.

    Radio
    Power Supply
    Guitar Distortion Pedal
    Temperature Measuring Device
    Logic Gates
    Electronic Musical Keyboard

    can anyone tell me what is the purpose of diode in these projects.
     
    Last edited by a moderator: Aug 3, 2010
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,685
    900
    You have restated the same thing three times, but have not really defined a specific question that can be answered. For example, the first link you give links to a schematic that contains 4 diodes (zener, LED, 1N4148, 1N400X). Which diode's function is not clear to you? The second link you give leads to nothing. It is just something general about motor control.

    1) You have spent 4 days studying this/these question(s). What partial solutions have you reached?
    2) Have you read the AAC ebook on diodes?
    3) I suggest that you draw the specific portions of the circuits that you do not understand and post each one as a question plus say what you think the purpose for each may be. I am not suggesting separate threads for each.

    John
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The OP needs to post specific circuits, as the post otherwise appears to be very close to spam.
     
  4. Xufyan

    Thread Starter Member

    Aug 3, 2010
    114
    0
    Electronic Musical Keyboardi want to know the function of these diodes , 1N4148, 1N400X.

    In the last four days i found about 8 pojects which are using diodes and i also manage to find the purpose of diode in those projects.
    here is the list of projects,

    Mobile Phone Incoming Call Detector
    Telephone Audio Interface
    Geiger Counter
    Emergency (Police/Fire) Siren and Chime Electronic Circuits
    Cell Phone Battery Charger
    Amplifier
    Infrared Remote Control
    Electronic Musical Keyboard
    Logic Gates
    Temperature
    Measuring Device
    Guitar Distortion Pedal
     
  5. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,685
    900
    The first link is to a toggle switch. Is that what you are referring to? Here it is:
    [​IMG]

    D2 is a protection diode for the inductive "kick" from the relay coil. Look it up in the ebook. D1 is a blocking diode. Ask yourself what will happen to the time constant for the down stream capacitor (C2) and resistor (R5) input to the 4013, if it were not there? Look at R3 and R4.

    Copying and posting the schematic or circuit element is no big deal. But since this is homework on which you want help, you should make at least that effort.

    John
     
  6. Xufyan

    Thread Starter Member

    Aug 3, 2010
    114
    0
    Thanks alot....now i've understand the circuit little bit..can you tell me how did you identify for what purpose the Diodes are connected...?
    i am just a newbie in all these
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    When you learn a little about electronic circuits then the function of the parts is obvious.
     
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