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  • cmoy headphone amp

    hello

    does it make sense to use a headphone amplifier like the cmoy for the detector projects here. or is useless/ not necessary?

    i just plan to build some cmoy for use with my netbook

    i think it could work also with some detector maybe man can hear a weak signal better

    regards

  • #2
    IMHO you'll get much better sound with real headphone amp than any of the MD-s around. Somehow they all lack a solid audio output

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    • #3
      hello
      thanks for that answer
      that was something i thought too
      but im not sure if this will bring some better results in audio target identifiction
      for example: at baracuda i hear with light thresh a 2e coin at 32cm and with headphone amp it could be 35cm or more? then i would make sense
      if there is no change it were useless

      but i will try next time when i build first cmoy

      regards

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      • #4
        There is a difference in spatial perception with headphones against without them. Mono sound is "placed" inside your head, and it is always distinctive against any surrounding sounds (that are spatially outside).

        You'll not gain any additional depth or discrimination or, well, anything in that direction, only a somewhat different attention modulus. You'll know if you did the right thing by time of comfortable use and level of distraction.

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        • #5
          hello
          here my work from last hours
          this is first time i made a pcb by myself with sprint layout
          if somebody could check it were nice
          Click image for larger version

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          regards

          p.s. if it works i will share for sure

          more p.s. i think i could make it smaller had take wrong size for headphone jack arrrr an some resistors could stand elkos are to big

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          • #7
            hello sven thanks

            know this links already read all this sources some weeks before
            but i think i can do my own complete for under 20€
            with a little bit of diy work
            i need some training in sprint layout and reading shematics
            i think the kits on ebay are sold to expensive
            the example calculation on jds electronics is only right when you order expensive parts from surpreme electronic warehouses
            and single pieces

            and if the foreign offers (abroad from EU) are over 21 euro i have to pay import tax and service tax to the german Zoll

            but thanks for your help

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            • #8
              Originally posted by bernte_one View Post
              hello sven thanks

              know this links already read all this sources some weeks before
              but i think i can do my own complete for under 20€
              with a little bit of diy work

              but thanks for your help
              I agree you can easily build one yourself cheaper, I have saved these websites a few years ago when I was interested in building my own as well. Just never got around to it.

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              • #9
                1) I've never heard a detector that had such weak headphone output that it needed an amplifier. You aren't going to hear anything amplified that wasn't there before you added the amplifier. In fact, you'd probably end up turning the amplifier down so far that the output would be the same as what it was without the amplifier. (Remember, most metal detectors have speaker-level output, so you have to turn the volume down, not amplify it, for headphones.) If the environment is so noisy that you need more amplification to hear the tone, you're probably risking deafness. (Why are you detecting behind a running jet engine?) 2) An LM386 makes a much simpler circuit - basically a volume control, 1 battery and a few capacitors. (The "power supply circuit" is a battery - no other parts.) And it has much more output. The other advantage is availability - in the US, even Radio Shack carries it (for $1.69).

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                • #10
                  True, however, for new DIY builds you may chose whatever audio PA you wish, and cmoy just nicely fits the bill. OK, not in every build.
                  LM386 is not exactly a favourite for headphones due to its notorious hiss, and it draws quite a lot of current.

                  Too many MD-s have significant DC offset at audio output, and somehow it seem to be the most neglected part of them all.

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