Easiest way to make an amp?

Discussion in 'The Projects Forum' started by kevin gonzalez, Aug 1, 2015.

  1. kevin gonzalez

    Thread Starter New Member

    Jul 30, 2015
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    Can anyone tell me what is the easiest way to amplify sound. Ex-a transistor amp ? Any info would help
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Buy an audio amplifer?

    (Ps. The quality of answers on this forum is directly proportional to the quality of your question)
     
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  3. ebeowulf17

    Active Member

    Aug 12, 2014
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    There are ICs that do most of the work for you, possibly similar to the mystery chip in your other thread. The lm386 seems to be a very popular choice, though I have no personal experience with it. Its datasheet includes lots of example circuits, plus there are countless sources online of complete breakout board amp circuits based on the lm386 if you'd rather go that way.
     
  4. tjohnson

    Active Member

    Dec 23, 2014
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    I asked a similar question a few months ago in this thread: http://forum.allaboutcircuits.com/threads/simple-pc-audio-amplifier-circuit.109732/

    It is possible to build a functional speaker without an IC using transistors, but the sound quality will vary directly with the complexity of the circuit. You can build an amplifier circuit with just one or two transistors, which will offer extremely poor sound quality. Alternatively, you can build a more complex circuit with lots of semiconductor components, but it's much simpler to use an IC like the LM386. So unless sound quality isn't important to you or you want to build a complex circuit to learn the details of how amplifier circuits work, I'd suggest the same thing @ebeowulf17 did.
     
  5. Veracohr

    Well-Known Member

    Jan 3, 2011
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    Do you just need to amplify voltage or also drive a speaker?
     
  6. Alec_t

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    Sep 17, 2013
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    Use a megaphone?
     
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  7. CoolBeer

    Active Member

    Mar 29, 2010
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    Easiest way? lm386.
    Next easiest way? Opamp with a push-pull transistor stage in the feedback loop.
    Balls to the wall way? Three stage(LTP, VA, Output) transistor amplifier, read "Designing Audio Power Amplifiers" by Bob Cordell. (Highly recommended read btw).
     
  8. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Easiest way, buy an amplifier. Plug you signal into the " input" and speakers to the "speakers" jacks. Big range of power and quality options available. What is the source of your sound? Microphone, guitar pickup, phonograph, MP3 player, ...

    Each will have special requirements for amplifier - make sure to pick one that is intended for your source.
     
  9. ScottWang

    Moderator

    Aug 23, 2012
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    Easiest way, buy an amplifier online, pay online, choosing the home delivery, stay at home and drink tea to waiting for the amplifier coming ... :D
     
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  10. ScottWang

    Moderator

    Aug 23, 2012
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    Needs power or without power?
     
  11. ian field

    Distinguished Member

    Oct 27, 2012
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    For a quickie - I just use an amplified PC speaker.

    Usually my signal source wants a high impedance, so I just add a JFET source follower - the volume pot is usually about 4k7, so that can be used as the source load resistor, needing to add only 2 components; the JFET and its gate leak resistor............Oh!... and a DC blocking capacitor.
     
  12. #12

    Expert

    Nov 30, 2010
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    Could you give us a little less information?
     
  13. ian field

    Distinguished Member

    Oct 27, 2012
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    You stick a few bits in the back an' it makes it go louder.
     
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  14. bertus

    Administrator

    Apr 5, 2008
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  15. ScottWang

    Moderator

    Aug 23, 2012
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    One resistor adds totem pole driver using two bjts.
     
  16. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    How about a string and two paper cups.
     
  17. takao21203

    Distinguished Member

    Apr 28, 2012
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    Pam8403 module

    Order from me get it in a week or less
     
  18. ian field

    Distinguished Member

    Oct 27, 2012
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    Paper cups tend to be a bit fragile - most people use baked bean tins, and transmit rude noises.
     
  19. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    Why do I feel that this train (or is it thread?) is derailing very fast?
     
  20. #12

    Expert

    Nov 30, 2010
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    It's what I call a, "drive by" posting.
    Fire a question. Provide no details. Never respond again.
     
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