Circuit : Rev. Thomas
Scaraborough
Description:
A Coil Coupled Operation Metal Detector made from readily
obtainable components and using an ordinary medium receiver
as a detector.
Notes:
The metal detector shown here may well represent a new
genre. At any rate, after some exposure, it is regarded as
such by those who have seen it. It is based on a standard
transformer coupled oscillator (TCO) - hence the name Coil
Coupled Operation (CCO) Metal Detector. Although requiring a
BFO (in this case provided by a Medium Wave radio), it
differs from a typical BFO detector in that its performance
far outstrips that of BFO. Also, unlike BFO, it 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. Further, unlike
IB, the design does not require critical placement of the
coils. As with both BFO and IB, the design provides
discrimination. Experiments with different embodiments of
the idea have shown that it has the potential to match the
best of IB. Happy hunting! |
