oscillator circuits Interview Questions
Interview Question in oscillator circuits |
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In the absence of a nearby metal object, the two inductances LA and LB in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 710 kHz. When the search coil (inductor B) is brought near a buried metal object, a beat frequency of 6.5 kHz is heard. By what percentage does the buried object reduce the inductance of the search coil?
I'm just looking for direction on this one. You don't have to follow through all the way to an answer.
Thanks so much for your help. I'll Best Answer promptly.
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I haven't made any oscillator circuits before, but for my essay I need to do a lab and basically create a transformer, but more like a wireless energy transfer apparatus.
I was advised that a DC power source would only short-circuit. So I have an AC power source with variable voltage, but I need the oscillator to oscillate at a specific, known frequency. Would the AC source somehow change the oscillating frequency? Sorry if my question is frustrating, because I am a high school student who learned everything about electrical circuits on wikipedia and through other personal research.
So, to simplify my question: if I connect a capacitor, inductor, and an AC power source in series with no resistors, would it generate the desired frequency (from LC) without shorting the circuit? If I need to add resistors, which model/configuration is the simplest and most reliable? What type of power source do I need?
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