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Friends,
I am here making public what I believe to be a new concept in metal detector design. I could be wrong.
Unlike IB, this design requires a BFO, which in this case is provided by a Medium Wave radio. However, unlike BFO, its performance far outstrips that of BFO, and also, the design is dependent on the balance of two coils to boost sensitivity. It also differs from IB in that its Rx section is an active, rather than passive, component of the oscillator.
The circuit will be instantly recognisable as a transformer coupled oscillator or TCO (sometimes called a tuned collector RF oscillator). This essentially consists of an amplifier which, by means of a transformer, feeds the output back to the input, thus sustaining oscillation. On the basis of its similarity with a TCO, I have named it a "Coil Coupled Operation" or CCO Metal Detector.
At the time of writing, three embodiments are due for publication, based respectively on a bipolar transistor, a CMOS IC, and an op-amp. One of these designs matches the performance of a respectable IB metal detector, thus showing the idea's potential.
I won't be looking in here myself, but do feel free to contact me at [email protected] I know that people enjoy a new design, and I had one spare. Feel free to pass it on.
With kind regards,
Thomas.
I am here making public what I believe to be a new concept in metal detector design. I could be wrong.
Unlike IB, this design requires a BFO, which in this case is provided by a Medium Wave radio. However, unlike BFO, its performance far outstrips that of BFO, and also, the design is dependent on the balance of two coils to boost sensitivity. It also differs from IB in that its Rx section is an active, rather than passive, component of the oscillator.
The circuit will be instantly recognisable as a transformer coupled oscillator or TCO (sometimes called a tuned collector RF oscillator). This essentially consists of an amplifier which, by means of a transformer, feeds the output back to the input, thus sustaining oscillation. On the basis of its similarity with a TCO, I have named it a "Coil Coupled Operation" or CCO Metal Detector.
At the time of writing, three embodiments are due for publication, based respectively on a bipolar transistor, a CMOS IC, and an op-amp. One of these designs matches the performance of a respectable IB metal detector, thus showing the idea's potential.
I won't be looking in here myself, but do feel free to contact me at [email protected] I know that people enjoy a new design, and I had one spare. Feel free to pass it on.
With kind regards,
Thomas.
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