Old long-range listening gadget from the 99c store...

Discussion in 'General Electronics Chat' started by Externet, Jul 28, 2016.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
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    Has anyone one of those horribly cheap pocket amplifiers meant for listening sounds from 100? feet away that were sold by the 99c stores about 10 years ago ?
    It was about a zippo lighter size for the shirt pocket with an earphone, those were the years they had equally horrible FM radios for 99c too.
    There are better on the market but cannot find those cheap ones anymore.

    Edit: adding a picture ----> https://s3.yimg.com/bt/api/res/1.2/...enfs.com/en-US/blogs/digitalcrave/Spy-Ear.jpg
     
    Last edited: Jul 28, 2016
  2. #12

    Expert

    Nov 30, 2010
    16,261
    6,770
    Cute, but I've never seen one.
     
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,681
    900
    There's a simpler solution. You can hear a squirrel a mile away:
    upload_2016-7-28_18-15-21.png

    John
     
  4. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
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    I think I may have had one for a while and I may have reverse engineered a schematic for it. If I have it, I'll post it but if I recall it was a two-transistor design.
     
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  5. tcmtech

    Well-Known Member

    Nov 4, 2013
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    I've came across a number of those things over the years. Most were either a two or three transistor high gain amplifier or a LM386 set to near max gain.

    The only thing I found the good for listening into was my clothes pockets rustling around and rubbing on the device as I moved. Long distance sound was completely drowned out by that.
     
  6. absf

    Senior Member

    Dec 29, 2010
    1,492
    372
    I have a few of them years ago and I managed to duplicate the circuit on a vero board just to see if it can be improved...

    Really surprised to see that they are still available on our local eMarket. Only slightly more expensive (US$3.50) here.

    spy-ear-vester.jpg
    spyear_2.jpg
     
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