Please help me measuring AC voltage with this VOLTMETER

Discussion in 'The Projects Forum' started by nemo4all, Mar 12, 2010.

  1. nemo4all

    Thread Starter New Member

    Mar 12, 2010
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    I want to measure household voltage...that is about 200V - 250V AC

    I saw this project with the ADC IC ICL7107 here

    but the problem is this measures DC voltage....

    Please suggest me how will i measure the 250V ac current....???
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The ICL7107 is a DC voltmeter chip. Do you have any electronic skills? We have to know, as dealing with line voltage is quite dangerous. You will need to be able to assemble small parts on a board and house them all in an insulated case.

    A very inexpensive DVM will do what you want. It will cost less than the parts to make your ICL7107 safe to measure AC.
     
  3. nemo4all

    Thread Starter New Member

    Mar 12, 2010
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    0
    yes i do have electronic skills...
    Actually i want to add two of these voltmeters on the input and output of a 1kv 220volt step up transformer and monitor it all the time....
     
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    Then look for an AC voltmeter IC, instead of using a DC one....

    Or buy a DVM, you can still look at the display and "monitor" those lines..... some DVM even have a sample and hold function, and some can interface to a PC for data collection.

    B. Morse
     
  5. nemo4all

    Thread Starter New Member

    Mar 12, 2010
    6
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    and moreover i want to use the seven segment display so that it is visible from a little far all the time...
     
  6. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    You don't say where you live, but if you're in the US, Harbor Freight (and others) sell little digital multimeters for less than $10 (I've seen them on sale for $4 in the local store). You could use two of these and a wall wart and be up and running in very little time.
     
  7. nemo4all

    Thread Starter New Member

    Mar 12, 2010
    6
    0
    yes I am from INDIA...here we have cheap DVM too...i surely can use them ...But the problem is they all use LCD which u cannot see from lil far or at night in a glance...
    That is the reason i wanted to use the seven segment display...
     
  8. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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