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In line meter for SD/GP

A

Anonymous

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Hi Eric and All,
I curious as to whether or not an in line meter can be added to the headset cord to give folks with some hearing loss a shot at some of the deeper and faint targets while hunting gold nuggets. I guess my main question would be is there one sensitive enough to do the trick or possible a home stereo type LED set up.
Some of our best targets seem to be those that just barely break the threshold so sensitivity is a BIG issue. I have seen some used on VLF units that work very well.
Thanks in advance, Bill S.
 
Hi Bill,
I had a look at the audio signal on a GP Extreme, but it is not readily convertible to a meter signal with any useful sensitivity. I did get a meter to work, with a diode bridge arrangement to rectify the two frequency sine waves. OK on stronger signals, but the weak ones did not show, due to the diode voltage drop. The hi/lo tones are confusing on a meter as they come out the same, and with a small nugget, the low tone is after the coil has passed the object.
I'm sure it could be done electronically with an additional bit of circuitry and a small battery, but there is no straightforward solution.
Eric.
 
Hello Eric,
I was afraid there may be a problem with the weaker signals that barely break the threshold and naturally those are the ones that are most important to us while nugget hunting.
I have had a recent bout with a ear infection with some severe temporary hearing loss and this is what got me going on trying to figure out a way for those with hearing loss to enjoy the hobby.
Thanks, Bill S.
 
Eric. if you could capture a picture of the signal like a sine wave on an ossilascope. Would it give you more info. than a auible signal would. For example, would a small iron, lead, gold target give a different shape wave? Or is the signal processed out to an ampitude only signal?
would a weak signal show a peak better on a noisy background?
I have always had this question but been afraid to ask
 
Hi Kimble,
No, you would not get any more information. The signal is amplitude only and, to me, it looks more confusing on a 'scope. The ear is best at picking out a weak repeatable signal.
Eric.
 
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