Quote:
Originally Posted by Dave J.
That schematic appears to be an early 1970's induction balance (not synchronously demodulated) of the same general sort that's been around since the late 1800's and is still the mainstay of underground utility locating and tracing.
I can't vouch for how good a design it was for its time, but I presume that it worked.
In other words if this is an "LRL", then there are lots of LRL's on the market which nobody disputes that they work, and the manufacturers thereof don't go whining that the dreaded "skeptics" keep ruining their game. In fact, at least two of this forum's most dreaded "skeptics" work for companies that make such apparatus!
But since nobody calls commercial well-engineered induction balance apparatus "LRL's", that means that they aren't LRL's. We all understand the term "LRL" to be reserved for apparatus that doesn't actually do anything worthwhile other than to perform wallet biopsies on behalf of the manufacturer and to punish customers for being gullible.
--Dave J.
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This circuit can pass a double blind test to locate a US dime at more than 6 inches distance.
You will see that this qualifies it as an LRL which can be proven to locate at longer distances than other LRLs can locate USA dimes in a double blind test.
However, it fails to locate large sums of money at long distance from LRL purchasers.
Best wishes,
J_P