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Offline mikebgTopic starter
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I prefer to think instead to experiment
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« on: July 05, 2010, 01:40:25 am »
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Quiz: Best search oscillator circuit for BFO MD
There are different circuits of LC search oscillators, where L components are used as sensor for metal: Colpitts, Hartley, Meissner, Armstrong. When L is close to metal target, the frequency of oscillation is shifted. This principle of operation is used in "Frequency shift metal detectors". The rest of the circuit provides to operator information about the direction and magnitude of the resulting frquency shift. Since in most cases it contains reference oscillator (BFO), the metal detector is called BFO MD.
The quiz is:
WHAT OSCILLATOR CIRCUIT PROVIDES MOST FREQUENCY SHIFT AND WHY?  :Smiley
HINT: For metal detecting are used two types inductive sensors: monocoil and two or more coils (separate RX & TX) positioned in induction balance. To answer to quiz, you should know which type sensor is the best for metal detecting and why.

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