 |  | Quote: |  | | Posted by argyrism | | |  |
| I recently bought a cheap metal detector for testing purposes (MD-303). As i understand it is using VLF technology. My simple idea is: the detector have a headphone output - so if i connect this to the line in of a laptop and use some audio software, is it possible to find the audio frequence lets say where gold is detected ( when i put gold on the search coil the sound slidly changes) and then just use a program like tone detector to detect whenever this or othe metals frequencies slightly change. Im particularly interested to find the audio frequency of gold as the specific metal detector detects gold but not very well. I believe that this idea will give more sensitivity to any vlf metal detector.
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We've discussed this before and the answer is a qualified "Yes." Your machine must be able to be set to the tone discriminate mode for this to be a viable test. There's also some great, free software out there for you to use when testing. Just remember that this software uses your sound card in your PC and cannot be directly connected to any circuit components inside the unit. It can only accept your audio output. To use it as a circuit tool requires an isolation type probe.
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http://www.electronics-lab.com/blog/?p=1011
Have fun and tell us all about your experiments.
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http://www.thunting.com/smf/index.php/topic,14146.msg89996.html#msg89996
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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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