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Comments

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  Steve Mattox August 8, 2013 at 1:43am

  very cool little amp do u sell them ??????????????
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  bemuzic August 17, 2010 at 8:47am

  wow great, I'm amazed how loud that is for just.75 watts!!!
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  Robbie Pitts August 17, 2010 at 8:45am

  Make did a really good job of showing the breadboarding process of the circuit step-by-step. I like how the first page's drawing has a 6" speaker in the cracker box, yet it shows them installing a 2" speaker in the box. Go for 4". The 4" speakers really make some noise.
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  Naz Nomad August 17, 2010 at 8:16am

  Here's the Make: Magazine's original Cracker Box Amp article if anyone needs it ... http://www.mediafire.com/?gv9psgs40r69pbm
  
  Keep it 'Nation' ... if my link's posted elsewhere, I'll have to take it down .. cheers.
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  Robbie Pitts August 16, 2010 at 8:01pm

  The Process of Building a Cigar Box Guitar Amp - Little Gem or The ...
  
  Here is my newly published Instructable. Let me know if I'm missing something or what you think.
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  Robbie Pitts August 16, 2010 at 7:01pm

  @Barry,
  Yes, I am working on an Instructable right now. Well, all day. I should have it finished by late tonight. I really want to make a video of me assembling one, but that would probably be about as fun as watching grass grow.
  
  @Naz,
  It would probably crank at 12 volts, but I would personally shoot for a regulated 12 volts since that is the max on the datasheet.
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  Naz Nomad August 16, 2010 at 6:13pm

  ... also, i'd be interested to see how it sounded if you pushed it with 12v. Probably even better, I'm thinkin'?
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  Barry Evan Russ August 16, 2010 at 6:09pm

  That is impressive. Can you tell me if you have the sources for your parts, and a schematic or layout? I'd love to make one for my sepf and a friend. Cheers
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  Robbie Pitts August 16, 2010 at 4:22pm

  @Naz
  Your statement is correct. The typical output, according to the N.S. datasheet, is 700mW. The minimum output is 500mW. I used to use the LM386-1, and the datasheet shows this one only has a typical output of 325mW. I found that Jameco had the -3 and had to upgrade. I hope that this doesn't put me in the same category as some amp manufacturers. :0 I did round up to 3/4, which is 7% more than the datasheet says.
  
  http://www.national.com/ds/LM/LM386.pdf
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  Naz Nomad August 16, 2010 at 3:50pm

  I thought the 386-3 was a ½watt chip? ... Sounds cool, and I see your roadie is working hard too :-))