Hello everyone!
I am skylly, I am new here, and want to learn more technical knowledge about metal detector from here.
I attempt to make a simple BFO metal detector first.
I know that the search frequency and reference frequency of BFO type is slightly different.
But when I look at the "pocket metal detector" by Frank Hughes, url: http://www.sm0vpo.com:800/_visitors/...aldetector.htm
The reference oscillator is 400KHz and the search frequency is 100KHz,
why they are such a big difference and whether it or not to still work properly?
I am skylly, I am new here, and want to learn more technical knowledge about metal detector from here.
I attempt to make a simple BFO metal detector first.
I know that the search frequency and reference frequency of BFO type is slightly different.
But when I look at the "pocket metal detector" by Frank Hughes, url: http://www.sm0vpo.com:800/_visitors/...aldetector.htm
The reference oscillator is 400KHz and the search frequency is 100KHz,
why they are such a big difference and whether it or not to still work properly?
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