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Gold Prospecting
Do It Yourself (DIY) Projects
My detector builds-so far.
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<blockquote data-quote="Guest" data-source="post: 225946"><p>Nah mate- I don't have anything to test it against. It is preset for inductance and frequency, but there is a trimpot to calibrate capacitance. As this is my first PI build, and the first experience I have had with non pre-set values it is a learning curve, but I am relatively confident I can get close enough to the mark to make fine tunings via observation. I am yet to fine-tune the Surf. It was pre-tested, offset at 0v and R10 @ 2.2K, which is by definition the least resistance/ most sensitivity available at the coil. For a homebuilt board they say start at 3.3K and reduce to get most sensitivity, suggesting a 2.5K max.</p><p>I am reasonably sure the secohmmeters' inductance is accurate, and I probably could not improve the performance of the Surf anyway.</p><p>To be honest I am quite chuffed with the performance. It is on par with my Infinium- they are about $2 grand now. The built and tested board was $100+ postage, add a few sundries and a box and I'm still under $150.</p></blockquote><p></p>
[QUOTE="Guest, post: 225946"] Nah mate- I don't have anything to test it against. It is preset for inductance and frequency, but there is a trimpot to calibrate capacitance. As this is my first PI build, and the first experience I have had with non pre-set values it is a learning curve, but I am relatively confident I can get close enough to the mark to make fine tunings via observation. I am yet to fine-tune the Surf. It was pre-tested, offset at 0v and R10 @ 2.2K, which is by definition the least resistance/ most sensitivity available at the coil. For a homebuilt board they say start at 3.3K and reduce to get most sensitivity, suggesting a 2.5K max. I am reasonably sure the secohmmeters' inductance is accurate, and I probably could not improve the performance of the Surf anyway. To be honest I am quite chuffed with the performance. It is on par with my Infinium- they are about $2 grand now. The built and tested board was $100+ postage, add a few sundries and a box and I'm still under $150. [/QUOTE]
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Gold Prospecting
Do It Yourself (DIY) Projects
My detector builds-so far.
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