Lm386

Discussion in 'General Electronics Chat' started by ojou-san, May 19, 2013.

  1. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    Hello. I wanna ask how come Power Converters and Ultrasonic drivers became an application for LM386. How do I use LM386 in those applications? What is power converters?What does it do? What is an Ultrasonic drivers? What does it do?:confused::confused::confused:
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    I have no idea what you are saying.

    Ask one question at a time.

    What are you trying to do?
     
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  3. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    Sorry about that. Well I don't know about power converters and ultrasonic drivers and our professor is telling us to use LM386 in power converter and ultrasonic driver.So how do I use LM386 in power converter and in ultrasonic driver?
     
  4. timescope

    Member

    Dec 14, 2011
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    The Texas Instruments' LM386 datasheet lists those applications. The bandwidth with pins 1 and 8 open is 300kHz so it could be used in those applications although it is described as an audio amplifier.

    Timescope
     
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  5. tubeguy

    Well-Known Member

    Nov 3, 2012
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    Did your professor give you any specifics ?
    If so, please post that info.
     
  6. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Ojou-san,

    Normally, devices that generate signals (op Amps, logic chips, crystal oscillator circuits), do not have enough power to do anything more than generate signals. Therefore, you need to connect these signal generating devices to a "driver". A driver is a circuit that can amplify the input signal to provide sufficient power to any motor, loudspeaker, ultrasonic horn or other device that can really make something happen.

    Although the LM386 is referred to as an "audio amplifier", it can amplify any signal in the audio frequencies (and even above) for non-audio applications. Audio frequencies are generally from 20 Hz to about 20k Hz. The LM386 will be useful from DC to 30k Hz (10x amplification) to 100kHz (3x amplification).
     
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  7. MrChips

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    Oct 2, 2009
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    A driver does not need to amplify the signal. What it needs to do is drive enough power.
    Power is calculated as P = IV or using all combination of Ohm's Law I = V/R.

    What is missing from your discussion is the load resistance R.

    You need to discuss what is the load R.
     
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  8. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    He didn't give any specifics rather he just told us to research about the significance of active filter into the power converter and in ultrasonic drivers. He just told us that ultrasonic drivers has something to do with pressure. :(
     
  9. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    Thanks for that explanation. I already tried doing that. I used LM386 as an audio amplifier and it really works when I tried in Multisim. But my problem now is what does it do in Power Converters and in Ultrasonic Drivers?
     
  10. MrChips

    Moderator

    Oct 2, 2009
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    Can you talk about one application at a time:

    1) Power converter

    What is your load impedance?
    How much power?
     
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  11. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    Well He didn't tell anything in particular. Just Power Converter. Maybe any value as long as it is power converter.
     
  12. MrChips

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    Oct 2, 2009
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    Well you will have to come up with your own specs.
    Calculate the current and voltage requirements for various loads from 1Ω to 1MΩ.
     
  13. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    My own specs? hmmm
    current? how about 1.5 amps?

    all 50 Ω
    with a voltages of 25V,50V,75V and 100V?
     
  14. MrChips

    Moderator

    Oct 2, 2009
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    No! No! No!

    We're talking about an LM386, aren't we?
     
  15. ojou-san

    Thread Starter New Member

    Jan 7, 2013
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    Ah Ok I get it. Sorry about that. I thought it was about power converter. 3-15VmA and the voltage? 5V?
     
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