making a amplifier with a lf 351n

Discussion in 'Analog & Mixed-Signal Design' started by johanispro3, Sep 25, 2016.

  1. johanispro3

    Thread Starter New Member

    Sep 25, 2016
    1
    0
    Hello,
    This is my first post on this forum, I'm new to electronics but eager to learn
    I have a big interest in audio and I want to make an amplifier for a 8ohm 0.5W speaker I have lying around, if I connect it directly to the audio jack of my phone
    it barely makes any sound. So after some research I discovered I need an amplifier IC. So after hours of digging around on old pcb's I found a chip. An LF 351N. The datasheet gives says it's an op amp, but for circuitry I could only find some exemplary uses on the datasheet. I found a circuit for an inverted amp, will an inverted amp be suitable for listening to music? Anyway, I'm looking for a cicruit for this chip to make an amplifier. All help is appreciated.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,967
    744
    You wont make a loud noise from that chip, you're better using a Lm380...
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    It is correct to say that you need an amplifier but all amplifiers are not created equal. What you need is a power amplifier.

    An op-amp (operational amplifier) is the generic term for an idealized type of amplifier.
    An ideal amplifier has some desired characteristics:
    • Infinite input impedance
    • Zero output impedance
    • Infinite voltage gain
    • Infinite band-width
    No such op-amp exists.

    What you are looking for is a power amplifier designed to drive an 8-ohm speaker with a certain amount of power (0.5W as you requested) with a frequency range in the audio range 20-20kHz.

    LM380 is one example of a low power audio amplifier.
     
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