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4hv.org :: Forums :: General Science and Electronics
« Previous topic | Next topic »   

Electrical Quizzes - QUIZ 8 POSTED

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Hazmatt_(The Underdog)
Thu Feb 16 2006, 07:34AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		100KHz sampled at 49KHz, same idea behind frequency counters, gating the input.
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Steve Conner
Thu Feb 16 2006, 11:33AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		I'm going to guess a 1kHz square wave with 10 microseconds of jitter. shades
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WaveRider
Thu Feb 16 2006, 11:43AM
WaveRider Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
 		I will guess a 500 us long 24.5 kHz pulse train that repeats periodically (that is to say 500us pulse train followed by 500us silence )....assuming an edge-triggered flip-flop...
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HV Enthusiast
Thu Feb 16 2006, 12:43PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
wrote ...

Dan, is the duty cycle 50% on both square waves?

Yes, square waves are 50% duty cycle.

No one has gotten it yet. Hint: The answer isn't anything complicated (i.e. jitter, delays, etc...)
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WaveRider
Thu Feb 16 2006, 12:57PM
WaveRider Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
 		I'll have another go... How about a 1 kHz square wave..
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Dr. Shark
Thu Feb 16 2006, 01:14PM
Dr. Shark Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
 		for 1ms the clock will toggle when the input is high, so the output will follow the clock at 49kHz. Then for 1ms the clock will toggle when the input is low, so there will be silence on the output. So there will be 1ms burst of 49kHz interrupted by alternating high and low pauses. Actually not sure about that, the pauses could also be all low. Is this what people do for SSTC interruptors?

EDIT: the beat frequency between the 100kHz wave and what I view as a 98kHz wave would be 2kHz, so 500us long bursts of 49kHz
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HV Enthusiast
Thu Feb 16 2006, 02:20PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Everyone is getting pretty close, but no correct answer yet.

Keep on trying!!! smile

[EDIT - Did everyone give up already ? ? ?]
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...
Fri Feb 17 2006, 12:57AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		hmm, well assuming it is an edge triggered d flip flop, the Q will take on D when the clock changes. Because the output can only change at the falling edge of the clock, the output wave can only be some factor of 100khz, so with a 49khz input frequency I would expect a 50khz output frequency. But because the output will be going 2% faster than the input one pulse will be missing every 50 cycles...
So; you will have a 49pulses at 50khz followed by a missing pulse, followed by another 49 pulses at 50khz...

Edit:
OH, I get it now, I was imagining the clock and the d input backwards :-@
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HV Enthusiast
Fri Feb 17 2006, 02:13AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Well, its been about 24 hours and no correct answers.

The correct answer is a 2kHz square wave.
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...
Sat Feb 18 2006, 02:52AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		hmm, care to elaborate as to why? I just canf figure it out confused
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