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3/14/02: Minute Paper

3/14/02: Minute Paper. How do touch lamps work? Have you ever lick a 9V battery? If we have AC coming out of outlets, and light bulbs rely on DC to operate, is there some AC-DC conversion in the lamp socket, or does the light bulb run on AC? Does the HW grader give partial credit?

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3/14/02: Minute Paper

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  1. 3/14/02: Minute Paper • How do touch lamps work? • Have you ever lick a 9V battery? • If we have AC coming out of outlets, and light bulbs rely on DC to operate, is there some AC-DC conversion in the lamp socket, or does the light bulb run on AC? • Does the HW grader give partial credit? • Speaking about frequencies of TV… Now does a satellite dish receive the signal? What kind of signal does it use? • What worse than seeing a worm in your apple? • Have a worm.

  2. Frequency Responses • Up to now, we have learnt • ac circuit analysis with periodic sources (fixed frequency, if multiple frequencies, use superposition principle) • Transient analysis • Now, frequency responses: filters and resonant circuits.

  3. ZS Z1 CD Player Amplifier Speaker Z2 ZL VS (Source) (Circuit) (Load) Transfer Function Since we are interested in frequency responses, we use phasors (frequency domain). VL(jw) is a phase-shifted and amplitude-scaled version of VS(jw)

  4. Filters • Low-pass filters (LP)

  5. Low-Pass Filters • Cutoff frequency w=wo=1/RC, HV=1/2 • working example • quick determination of filter type

  6. (a) (b) (c) Concept Check: filter Which of the following circuits is a low-pass filter? Answer: (c)

  7. High-pass Filters (HP) 1/2

  8. Concept Check: filters Which are the following circuits high-pass or low-pass filters? Answers: High-Pass Filters: (b) and (c) low-pass filters: (a) and (d)

  9. 3db point 20 dB/Decade Bode Plot: High-pass filter

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