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Oneeye_IO

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  2. Led display Digital Voltmeter question

    in Projects Q/A

    Posted

    Hi again
    I've found this -> http://www.jaknato.cz/konstrukce/teplomer.htm . If you say that you can't measure voltage on the same power supply, how does this thermometer work ? There is no other power supply for transistor PN junction. It's everything in one. I just only need to know if it's possible to make circuit which can measure itself? I want to make thermometer with LM35DZ sensor (same ground and voltage from power supply as

  5. Led display Digital Voltmeter question

    in Projects Q/A

    Posted


    Go back to page 1 of this thread and read all of the posts. There were changes made and since there are two different schematics on the site, I am not sure which one was corrected. Click on the links posted. Read the posts and make changes accordingly.

    MP


    Thanks, I'll try to find something usefull.
    So why didn't you move the right schematic to the projects pages ? ???

  6. Led display Digital Voltmeter question

    in Projects Q/A

    Posted

    Hi
    I tried to build digital voltmeter but it doesn't work :'( . I tried two ICl 7107 and it still doesn't work. I have never do anything with CMOS ICs so a I don't know if the IC is bad. ??? . I have done it on test board with schematic from http://www.electronics-lab.com/projects/test/014/ .
    Everything is feeded by old AT PC voltage supply.
    Only change I've done is change of 2K trimmer for 2k5 trimmer because I can't buy 2K trimmer

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