The Colpitts Oscillator

Chapter The Colpitts Oscillator

Complete Electronics Self Teaching Guide with Projects
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Complete Electronics Self Teaching Guide with Projects

  • CHAPTER 9 OSCILLATORS402THE COLPITTS OSCILLATOR20  Figure 9.15 shows a Colpitts oscillator circuit, the simplest of the LC oscillators to build.The value of each color used in the bands is shown in the following table (with units in μH):ColorSignificant DigitsMultiplierToleranceBlack01Brown11061 percentRed210062 percentOrange31,000Yellow410,000Green5Blue6Violet7Gray8White9Gold0.165 percentSilver0.01610 percentThe first two colored bands are the first and second significant digits of the inductance value. The third band is the multiplier and the fourth band represent the tolerance. For example, if an inductor is marked with blue, gray, red, and silver bands, its nominal inductance value is 6800 μH (6.8 mH) with a tolerance of 610 percent . Finally, you see inductors that have the value simply printed on them. This gen-erally occurs on higher-value inductors, which are also physically larger.Your best bet is to save the label on the packaging that the inductor comes in until you can check out the markings on the component.(continued)Book Authorc09V107/04/2012 3:23 PM c09.indd 4027/4/2012 3:23:58 PM