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Diac

Discussion in 'Electronic Basics' started by WAZ, Sep 2, 2006.

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  1. WAZ

    WAZ Guest

    Wht is meaning of Diac? Where it is used?
     
  2. Chris

    Chris Guest

    And while the OP is on the Google page, he should look at the sixth
    link:

    http://www.ee.washington.edu/stores/DataSheets/diodes/diac.pdf#search="diac"

    particularly Fig. 8.1 of the Teccor data sheet. Nearly all diacs are
    used for simple phase control of AC line voltage loads with triacs as
    triac triggers. (By the way, the extra few cents for a Q4015 is worth
    it -- don't use the Q2015 rated at 200V max. with 120VAC).

    Good luck
    Chris
     
  3. feebo

    feebo Guest

    you can use a diac to give privacy on phone sockets wired in parallel
    - i.e. stop someone picking a phone up in another room and listen to
    your call.

    insert the diac in one of the wires to each socket and done.

    in normal mode, the phone line sits there with about 50V on it
    (polarity is not an issue) which means when the phone is picked up the
    diac will conduct (>30V) but once the phone is off the hook, the line
    voltage falls to about 12-15V which is below the cunduction threshold
    for all the other diacs... the practical upshot is that you can call
    but with the line voltage below the threshold, anyone else picks up a
    handset gets a dead line. good huh?
     
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