A Simple Question related to the Amplifiers..

Discussion in 'General Electronics Chat' started by DJ57, Oct 12, 2011.

  1. DJ57

    Thread Starter New Member

    Oct 12, 2011
    9
    0
    Hi There..
    How can I test an IC either it is LM324, Quad Amp, either It is working or not before using in a circuit..
    Thanks
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    You need to power it up in a test circuit.
     
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  3. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    An oscillator is traditional. Difficult to make it quite foolproof but it generally sorts the living from the dead. A bit of ingenuity can arrange that devices with low gain, big input currents or big offsets will fail to oscillate. Fairly heavy output loading will spot busted output stages, and a near-sinewave or triangle wave should catch heavy distortion, assuming that you have an oscilloscope available.
     
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  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I used nearly 100,000 TL074 quad opamps in an audio equalizer product and every circuit was thoroughly tested. Not one opamp failed.
    But one didn't work because the opamp was mounted backwards and two had defective electrolytic capacitors.
     
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