MAKE: Noise — Discuss this article

Showing messages 1 through 13 of 13.

• unbelievable
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  I wired the circuit and it works with a vengeance. Extremely annoying. I'm getting a 5 second high pitched beep about every 5 minutes. We hid it in our boss's office and we can hear it LOUD AND CLEAR, but it's been in there for 2 days behind his desk and apparently HE CAN"T HEAR IT! the high pitch must be beyond his hearing range. The fact that he can't hear it is It's almost funnier than if it were driving him nuts.

  Posted by sanctuary on August 01, 2008 at 07:00:59 Pacific Time

• Hypothetically speaking...
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  ... if your well intentioned, but soon to be fired, henchmen, had constructed such a thing and hidden it with nefarious cunning somewhere in your office, how would you find it?
  
  I am new in my role so must demonstrate
  
  a) technological prowess
  
  b) one-upmanship
  
  c) the desire to take this to MAD if and as required.
  
  
  They have been obliquely teasing me about it over beers for the past two weeks and I need to demonstrate alpha male primacy
  
  
  Help (!)

  Posted by davehk on June 23, 2008 at 16:35:50 Pacific Time

• Hypothetically speaking...
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  The high pitched beep is very hard to locate, but the first small speaker I tried had a paper cone and emitted a click when the beep began and ended...That was easier to locate. You might try listening for the click. I eliminated the click by using an extremely small speaker with a mylar cone. Good luck! hehe

  Posted by sanctuary on August 01, 2008 at 07:08:11 Pacific Time

• 555 output
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  The output from the 555 is connected to the emitters from the 2 transistors. Is that how it's supposed to be? I apologize if I'm being stupid about something. Any thoughts?

  Posted by riffraff2001 on June 16, 2008 at 12:29:56 Pacific Time

• difficulties
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  If I'm reading that there is power running through the speaker, but I'm not hearing anything, what might be the cause? I've checked my connections about 10 times and I just don't see anything wrong with them. I am using the capacitor and resistor mentioned by one member that would be easier to troubleshoot. Any ideas?

  Posted by riffraff2001 on June 16, 2008 at 10:41:15 Pacific Time

• Circuit works.
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  Hello,
  
  I built the circuit again on my breadboard, and it checks out fine. As R-McDonald suggested below, making the rate faster will help debug any problems.
  
  If you mess around with the resistor and capacitor values, you can alter the repeat rate as well as the tone for some different effects.
  
  Brad
  

  Posted by Oneironaut on June 08, 2008 at 15:49:22 Pacific Time

• ???
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  Did anyone get this thing to work.
  I soldered the whole thing together and triple checked all my connections. I went by the updated schematic.
  
  Anyone alse?
  
  

  Posted by mkrygeri on June 04, 2008 at 17:04:01 Pacific Time

• ???
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  Hello,
  
  I will rebuild the project from the posted schematic this weekend to make sure there are no errors.
  
  Are you getting any output from the unit at all?
  
  Thanks,
  Brad
  

  Posted by Oneironaut on June 04, 2008 at 19:37:30 Pacific Time

• Debugging tip
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  A problem with the default values of the project is that the tone is so infrequent that debugging is hard. So here is a debugging tip if anyone is having trouble with this project.
  
  For R1, substitute a 1K resistor. For C1, substitute a much lower value capacitor (I used 2.2uf, which I had handy). This should give you a rapid ticking sound. At least you then know the circuit is wired correctly, and you can go back to playing with appropriate values for the components.
  
  This was a very helpful site for info on the 555 chip: link.
  

  Posted by r-mcdonald on June 08, 2008 at 15:15:54 Pacific Time

• Debugging tip
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  Thanks for the tip, that does make it easier to find an error.
  
  Brad
  

  Posted by Oneironaut on June 08, 2008 at 15:46:43 Pacific Time

• Beeping thing working?
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  Hi, I just wanted to see if you or anyone ever got this to work with the revised schematic.

  Posted by r-mcdonald on June 08, 2008 at 14:22:36 Pacific Time

• No schematic with part numbers
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  Am I missing something???

  Posted by ddave47 on May 23, 2008 at 22:20:27 Pacific Time

• No schematic with part numbers
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  Yeah I dont see how to build it without the part numbers...
  
  Also the project called for 2 capacitors, but in the schematic, it wants 3...

  Posted by Reza4444 on May 27, 2008 at 15:48:20 Pacific Time