+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Full Member level 2
    Points: 2,343, Level: 11
    Achievements:
    7 years registered
    nikhilsigma's Avatar
    Join Date
    Jun 2010
    Location
    Delhi, India
    Posts
    139
    Helped
    17 / 17
    Points
    2,343
    Level
    11

    How to connect Low resistance load....

    Hi guys.....

    i want to connect a speaker (1Ω , 3W) to an voltage output of an 555 timer which is a 1kHz pulse source.........and as u know it can only supply .5A current......

    so what kind of stage or buffer amplifier i should use...........to connect the speaker......


    Plz... Help me...!!


    thanking you....
    Nikhil

    •   AltAdvertisement

        
       

  2. #2
    Full Member level 6
    Points: 4,612, Level: 16
    Externet's Avatar
    Join Date
    Jan 2004
    Location
    Mideast US
    Posts
    392
    Helped
    27 / 27
    Points
    4,612
    Level
    16

    Re: How to connect Low resistance load....

    Connect a resistor in series to the speaker to get a current less than 0.5A. The value of the resistor would depend on the volage the 555 is powered with.
    Try around 50 Ohms



    •   AltAdvertisement

        
       

  3. #3
    Advanced Member level 5
    Points: 74,061, Level: 66

    Join Date
    Oct 2004
    Location
    West Coast
    Posts
    7,942
    Helped
    2329 / 2329
    Points
    74,061
    Level
    66

    Re: How to connect Low resistance load....

    Instead of a power-limiting resistor, connect a speaker through a capacitor ..
    It provides good dc isolation, so your speaker will be safe ..
    Something as small as 4.7uF and as big as 100uF should work, doepending on the supply voltage fed to the 555-timer ..

    IanP
    :D



    •   AltAdvertisement

        
       

  4. #4
    Member level 4
    Points: 1,302, Level: 8
    akshay_d_2006's Avatar
    Join Date
    Jul 2009
    Location
    Mumbai
    Posts
    76
    Helped
    12 / 12
    Points
    1,302
    Level
    8
    Blog Entries
    1

    How to connect Low resistance load....

    @nikhil... You need not need an amplifier... that current is enuf.
    Infact you need to limit the current sometimes....
    Plus as you are taklking about the buffer amplifier... dont go for it,

    As suggested, go for a simple capacitor, which blocks DC....



--[[ ]]--