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Rev 2.02<br />
E6D02<br />
Cathode ray tube (CRT) persistence refers to the length of time the image remains on the phosphor screen after<br />
the beam is turned off.<br />
E6D03<br />
If a cathode ray tube (CRT) is designed to operate with an anode voltage of 25,000 volts, and the anode voltage is<br />
increased to 35,000 volts the image size will decrease.<br />
E6D04<br />
Exceeding the anode voltage design rating can cause a cathode ray tube (CRT) to generate X-rays.<br />
E6D05<br />
A charge-coupled device (CCD) samples an analog signal and passes it in stages from the input to the output.<br />
E6D06<br />
A charge-coupled device (CCD) in a modern video camera stores photo-generated charges as signals<br />
corresponding to pixels.<br />
E6D07<br />
A liquid-crystal display (LCD) is a display that uses a crystalline liquid to change the way light is refracted.<br />
E6D08<br />
Core permeability (for a given size core) is the property that determines the inductance of a toroidal inductor with a<br />
10-turn winding.<br />
E6D09<br />
The usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for<br />
the frequency being used is from less than 20 Hz to approximately 300 MHz.<br />
E6D10<br />
One important reason for using powdered-iron toroids rather than ferrite toroids in an inductor is that powdered-iron<br />
toroids generally have better temperature stability.<br />
Applications for powdered Iron toroids would be oscillator and filter circuits where inductance stability with<br />
temperature is important.<br />
.<br />
E6D11<br />
Ferrite beads are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of<br />
transistorized HF amplifiers.<br />
E6D12<br />
A primary advantage of using a toroidal core instead of a solenoidal core in an inductor is that toroidal cores contain<br />
most of the magnetic field within the core material.<br />
E6D13<br />
Forty three turns of wire will be required to produce a 1-mH inductor using a ferrite toroidal core that has an<br />
inductance index (AL) value of 523 millihenrys/1000 turns.<br />
N turns = 1000 x (√ (L / AL)) or N turns = 1000 x (√ (1 / 523)) or 43.7 turns<br />
Jack Tiley <strong>AD7FO</strong> Page 59 3/15/2009