northwest Looking for audio project in gold gem and treasure
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australian electronic gold prospecting forum.com  |  DIY forum  |  DIY forum  |  Topic: Looking for audio project in gold gem and treasure 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Looking for audio project in gold gem and treasure  (Read 193 times)
6666
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« on: Friday April 5 2019 08:25:46 AEDT AM »

Hi all
I am trying to help a deaf friend , apparently a few months ago there was an article written by Woody in Gold Gem and Treasure magazine that converts the audio out from a detector to a vibrator or knocker, I would like to try and get hold of the circuit please, did anybody see this article or would be able to scan or photograph a copy , it would be much appreciated thanks.
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IBGold
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« Reply #1 on: Saturday April 6 2019 15:23:06 AEDT PM »

Are you talking about the one on Bone conduction I have built one I am hearing impaired and was not overly impressed but for a deaf person I do not think this would be the answer he did not provide any circuits.

Regards, Ian.  happy face
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Regards, Ian.
6666
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« Reply #2 on: Saturday April 6 2019 16:28:17 AEDT PM »

Hi Ian thanks reply yes that appears to be what my friend was asking about, we only had a brief conversation about it, went to the Library today and looked through what they had in GGT, but no joy, so Woody did not publish any circuits, my friend cannot hear low sounds hence my interest.
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« Reply #3 on: Saturday April 6 2019 16:39:19 AEDT PM »

I am the opposite I have trouble with the mid range and high frequencies if he has some hearing the bone conduction might work.

Regards, Ian. happy face
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Regards, Ian.
sd220d Digger
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« Reply #4 on: Saturday April 6 2019 17:48:04 AEDT PM »

  
Hi Ian thanks reply yes that appears to be what my friend was asking about, we only had a brief conversation about it, went to the Library today and looked through what they had in GGT, but no joy, so Woody did not publish any circuits, my friend cannot hear low sounds hence my interest.

This is easily fixed by using the tone control on the GPX detectors.
Up for higher frequencies and down for lower frequencies.
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Cliff
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« Reply #5 on: Saturday April 6 2019 18:06:07 AEDT PM »

Just an idle thought that crossed my mind yesterday.

If you were to use the vibrator section of an old cell phone which is basically a miniature dc electric motor and plug that into
the headphone socket of a detector, in theory it should "vibrate" with varying intensity depending on the strength of the
detected signal.

Secondary thought.....It would probably need a small currant boosting interface between the headphone socket and the dc
motor. The motor would then be attached to say a headphone harness and the user would experience a vibration to the
nerves of the skin whenever a target was detected.




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6666
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« Reply #6 on: Saturday April 6 2019 21:23:55 AEDT PM »

  
  
Hi Ian thanks reply yes that appears to be what my friend was asking about, we only had a brief conversation about it, went to the Library today and looked through what they had in GGT, but no joy, so Woody did not publish any circuits, my friend cannot hear low sounds hence my interest.

This is easily fixed by using the tone control on the GPX detectors.
Up for higher frequencies and down for lower frequencies.

Thanks I will mention this to him and see what he has tried with the tone control
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6666
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« Reply #7 on: Saturday April 6 2019 21:29:10 AEDT PM »

  
Just an idle thought that crossed my mind yesterday.

If you were to use the vibrator section of an old cell phone which is basically a miniature dc electric motor and plug that into
the headphone socket of a detector, in theory it should "vibrate" with varying intensity depending on the strength of the
detected signal.

Secondary thought.....It would probably need a small currant boosting interface between the headphone socket and the dc
motor. The motor would then be attached to say a headphone harness and the user would experience a vibration to the
nerves of the skin whenever a target was detected.






Thanks reply, yes thats how some circuits are working with op amps and transistor drivers for the motor , I hope I can find a solution to his problem.
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Cliff
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« Reply #8 on: Sunday April 7 2019 06:03:39 AEST AM »

Hi 6666,
             After robbing an old cellphone of its vibrator I connected it up via a spare jack-plug to the head phone socket
 of a Garrett detector........ it didn't work. Not to be defeated I then connected 2 rechargeable AA batteries [2.4v] in series
with the vibrator to the  collector and emitter of an NPN transistor [BC237}

I then connected  2 wires from the plugged in jack-plug onto the base and emitter of the same transistor. Bingo it worked!
I also tried putting the vibrator between the emitter and ground, this also worked.

After minor adjustments to the audio threshold control I found this very simple mod [1 transistor] to be surprisingly effective
and pretty good at pinpointing a target.

To conclude before I did all the above I connected an LED directly onto the above mentioned jack-plug, it lights up when
detecting a target. Good for silent night detecting! LOL

Hope this may be of some help.

Regards,

Cliff
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6666
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« Reply #9 on: Tuesday April 16 2019 09:39:01 AEST AM »

Thanks Cliff, I have a flat vibrator about the size of 10 cent coin in the mail so I hope that will sit flat under a wrist band or similar, looking forward to try it, cheers.
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