A Voltage-Controlled Oscillator (VCO) is a circuit that provides a varying output signal (typically of square-wave or triangular-wave form) whose frequency can be adjusted over a range controlled by a dc voltage. An example of a VCO is the 566 IC unit‚ which contains circuitry to generate both squarewave and triangular-wave signals whose frequency is set by an external resistor and capacitor and then varied by an applied dc voltage. Figure (1) shows that the 566 contains current sources to charge
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Wavelength (l) and Frequency (n) Relationships c=ln ‚ where l is wavelength in meters n is frequency in hertz‚ 1/s or s-1 c=3.0 x 108m/s (the speed of light in a vacuum) Typical question #1- What is the frequency of red light with a wavelength of 690.nm? (1m=109nm) First- l is wavelength in meters‚ so convert nm to meters 690.nm ( 1m )=6.90 x 10-7m 109nm Now we can rearrange the equation above and solve for frequency‚ since we already
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High Frequency? Or Insider Trading? Dow Intraday Trading May 9th 2010 High frequency trading has reached a point in which its legality needs to be called in to question. These traders hurt markets and other investors while forcing large investors to move into dark pools. High frequency traders also have an unfair advantage when it comes to trading. The above picture shows the most infamous trading crash caused by high frequency traders known to date. The Dow Jones Industrial average fell
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Fasten your seatbelts as Ho Chi Minh City is a metropolis on the move – and we’re not just talking about the motorbikes that throng the streets. Saigon‚ as it’s known to all but city officials‚ is Vietnam at its most dizzying: a high-octane city of commerce and culture that has driven the whole country forward with its limitless energy. It is a living organism that breathes life and vitality into all who settle here‚ and visitors cannot help but be hauled along for the ride. Saigon is a name so
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study‚ a student bought 3 bags of colored candy from stores and counted each color. The average number of each color in the three bags was distributed as shown. Color | Frequency | Brown | 556 | Yellow | 118 | Red | 344 | Orange | 57 | Green | 87 | Blue | 34 | a) obtain a relative – frequency distribution College
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Annette Lareau’s book Unequal Childhoods is a compilation of her observational data of 12 children between the years of 1994 – 1995. Recently‚ a second version of her book was published in 2011 that included follow-up interviews with some of the selected children ten years after the study finished. The 12 children selected for her study were put into various categories to facilitate a diverse range of economic‚ racial‚ and cultural backgrounds that would allow her to try to make broad observations
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The distribution of marks is shown in the following grouped frequency table. Marks|1–10|11–20|21–30|31–40|41–50|51–60|61–70|71–80|81–90|91–100| Number of candidates|15|50|100|170|260|220|90|45|30|20| (a) Copy and complete the following table‚ which presents the above data as a cumulative frequency distribution. (3) Mark|£10|£20|£30|£40|£50|£60|£70|£80|£90|£100| Number of candidates|15|65|||||905|||| (b) Draw a cumulative frequency graph of the distribution‚ using a scale of 1 cm for 100 candidates
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Ho Chi Minh: A Dark Side of a Nationalist Thesis Statement Ho Chi Minh - a figure of controversy – a patriot who devoted his life for the cause to liberate his nation‚ leading his country to independence and unification; but at the same time‚ a tyrant who‚ to achieve his goal‚ blindly followed the communism to massacre thousands of innocent people in the cruel land reform‚ dragging millions of his people to the deadly prolong war under the name of nationalism. Bibliography 1) Osborne‚ Milton. Ho
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it is still occurring in society‚ and especially in schools‚ even though the government abolished it several decades ago. Two articles—“Why Are All the Black Kids Sitting Together in the Cafeteria?” by Beverly Tatum and “From Still Separate‚ Still Unequal: America’s Educational Apartheid” by Jonathan Kozol—present two opposite views on the inequality in public schools. On the one hand‚ Tatum focuses on African- American racial identity development and the role of race in classrooms with
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shifting (2) Frequency shifting 07 (b) An audio signal 15sin2ᴨ (1500t) amplitude modulates a carrier 60 sin2ᴨ 07 (100‚000t). i) Sketch the audio signal. ii) Sketch the carrier. iii) Construct the modulated wave. iv) Determine the modulation index and percentage modulation. v) What are the frequencies of the audio signal and the carrier? OR 1 Q.4 (a) Determine the fourier transform of rectangular pulse shown below. Q.4 (b) A 107.6 MHz carrier is frequency modulated by
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