change 9V to 4V ps of circuit

Discussion in 'The Projects Forum' started by simf14, May 24, 2011.

  1. simf14

    Thread Starter Active Member

    Jul 27, 2007
    43
    0
    Hello Everyone...I need help changing the circuit to run off 4V instead of 9V for a door bell chime. Any help would be so appreciated!
     
  2. iONic

    AAC Fanatic!

    Nov 16, 2007
    1,420
    68
    I'm not sure the 555 will run with only 4V, 4.5V is the minimum I believe. Possible changing the speaker from 8 ohms to 4 ohms might help the output volume level, but you will still have to power the 555. Exactly what sort of power source are you using that you only have 4.0V?

    You could take a look at two other 555 alternatives:
    ZSCT1555

    or

    The EXAR XR-L555

    Not sure if either of these are available anymore.
     
    Last edited: May 25, 2011
  3. simf14

    Thread Starter Active Member

    Jul 27, 2007
    43
    0
    Thank you for your help...its really appreciated. Nothing is really ever easy is it? Trying to use the circuit for what it was not intended for. I will add an opticoupler or something. Thanks again.
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    Why 4 volt by the way? Strange voltage
     
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