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Diode Clipper and LM386 questions

Discussion in 'General Electronics Discussion' started by Yoa01, Nov 4, 2012.

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  1. Yoa01

    Yoa01

    214
    0
    Jun 18, 2012
    Hi all,

    I have two questions for you today. The first is about a diode clipper. I am pretty sure this design would clip a signal, but testing it in LTSpice with a sine wave running at 9v yields a constant 7.6v. Is something wrong here?
    clipper.gif

    Secondly, I adapted the amplifier circuit from the LM386 datasheet and added a couple caps and a potentiometer for adjusting gain. I have seen in many 386 amp designs that those bypass or decoupling caps are used, yet the datasheet doesn't show them. Same with the caps leading into pin 3. Are they necessary?
    LM386amp adj.gif

    Thank you!
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    Yes. It should clip.

    The best bet is to read the datasheet. They may be required under certain circumstances, or have to have certain values.

    Or, they may not be required at all, and are performing a function external to the 386 amplifier.
     
  3. Yoa01

    Yoa01

    214
    0
    Jun 18, 2012
    I ran a real test, running a synth through it, and it did clip very well, though a bit quiet. Probably should have done that before posting, sorry...

    Ok, I'll do that. Makes more sense anyway. Thanks!
     
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