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gamelektro

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Posts posted by gamelektro

  1. i made the project DS1621 pc thermometer From electronics-lab.com
    http://www.electronics-lab.com/proje...010/index.html or From
    http://www.riccibitti.com/pc_therm.htm

    i'm a newbie for electronics so There is something i want to ask?

    1. about voltage limiters (R1, DZ2, R2, DZ1) on the SCL clock input and SDA data input.
    how to look for the value for resistor and dioda zener for that project, i mean 4700 ohm and 5 volt dioda zener, what formula used in searching the value for that resistor and dioda zener. ? how to count it ? until we get the value for resistor and dioda zener?. i'm having trouble to read the data sheet because to many symbol that i don't understand.

    2.i'm learning the source code, but there is something i don't understand.

    temperature = (temperature_int * 256 + temperature_frac) / 128 * 5 / 10
    If temperature_int >= 128 Then
    temperature = temperature - 256

    i don't understand about the code, does anyone can help me to explain this code and explain the formula code? Please help.

    i'm sorry about the english sentence
    i'm doing my best to write it.
    Thank You

    Please Help me explain this project!!!!

  2. i made the project DS1621 pc thermometer From electronics-lab.com
    http://www.electronics-lab.com/projects/pc/010/index.html

    i'm a newbie for electronics so There is something i want to ask?

    1. about voltage limiters (R1, DZ2, R2, DZ1)  on the SCL clock input and SDA data input.
    how  to look for the value for resistor and dioda zener for that project, i mean 4700 ohm and 5 volt dioda zener, what formula used in searching the value for that resistor and dioda zener. ? how to count it ? until we get the value for resistor and dioda zener?. ???

    2.i'm learning the source code, but there is something i don't understand.

    temperature = (temperature_int * 256 + temperature_frac) / 128 * 5 / 10
        If temperature_int >= 128 Then
            temperature = temperature - 256

    i don't understand about the code, does anyone can help me to explain this code and explain the formula code? Please help. ???

    i'm sorry about the english sentence
    i'm doing my best to write it.
    Thank You

    Please Help me explain this project!!!! :)

  3. i made the project DS1621 pc thermometer
    http://www.electronics-lab.com/projects/pc/010/index.html

    There is something i want to ask?

    1. about voltage limiters (R1, DZ2, R2, DZ1)  on the SCL clock input and SDA data input.
    how  to look for the value for resistor and dioda zener for that project, i mean 4700 ohm and 5 volt dioda zener, what formula used in searching the value for that resistor and dioda zener. ? how to count it ? until we get the value for resistor and dioda zener?.

    2.i'm learning the source code, but there is something i don't understand.

    temperature = (temperature_int * 256 + temperature_frac) / 128 * 5 / 10
        If temperature_int >= 128 Then
            temperature = temperature - 256

    i don't understand about the code, does anyone can help me to explain this code and explain the formula code? Please help.

    i'm sorry about the english sentence
    i'm doing my best to write it.
    Thank You


  4. i made the project DS1621 pc thermometer
    http://www.electronics-lab.com/projects/pc/010/index.html

    There is something i want to ask?

    1. about voltage limiters (R1, DZ2, R2, DZ1)  on the SCL clock input and SDA data input.
    how  to look for the value for resistor and dioda zener for that project, i mean 4700 ohm and 5 volt dioda zener, what formula used in searching the value for that resistor and dioda zener. ? how to count it ? until we get the value for resistor and dioda zener?.

    2.i'm learning the source code, but there is something i don't understand.

    temperature = (temperature_int * 256 + temperature_frac) / 128 * 5 / 10
        If temperature_int >= 128 Then
            temperature = temperature - 256

    i don't understand about the code, does anyone can help me to explain this code and explain the formula code? Please help.

    i'm sorry about the english sentence
    i'm doing my best to write it.
    Thank You
  5. Hello Mr, what type trafo must i used? Trafo With the CT ( Center Tap ) or Without CT.?

    The trafo 12v/1,5Amp not sold In my country, there only have  12v/1Amp.
    I Have a trafo 12v/1 amp without a CT ( I buy it this morning) and 12v/300mA with CT ( already have it ).

    So Mr which must i choose for the trafo to make the voltage regulator with output 12 Vdc, ?
    Mr,  it is possible to make the Voltage Regulator 12vdc without 7812?, just using the trafo,dioda and capasitor.? Can we do that?!!!!
    and  if we can do that please tell me about the picture schematic?

    sorry if my english not very well?? Thank You

  6. I look the project in Electronic-Lab.com it's about DS1621 pc thermometer. 
    http://www.electronics-lab.com/projects/pc/010/index.html

    i need to know full explanation about the schematic, please tell me how ds1621 pc thermometer  work.  i didn't get understand what  function the diode zener in the schematic,  please tell me how it work the voltage regulator in the schematic. how the pc can read the data from the IC? i know about I2C but i dont understand about this project, The Explanation to little , is this project ds1621 really work?...I want to try to make this project.
    Please Help me... 

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