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Ch 20 4


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Ch 20 4

  1. 1. Ch 20-4 Electronic Devices
  2. 2. Electronic signals <ul><li>Electronics – the science of using electric current to process or transmit info. </li></ul><ul><li>Electronic Signal – carries the info and is sent as a pattern through a circuit </li></ul><ul><li>Controlling the electron flow produces a signal (ex. - high or low) </li></ul><ul><li>Examples in everyday life? Computer, TV, microwave, radio, </li></ul>
  3. 3. Electronic signals <ul><li>Electronics convey information with electrical patterns called analog and digital signals. </li></ul><ul><li>Analog – smoothly varying signal produced by continuously changing the strength or frequency of the signal </li></ul><ul><li>Digital – encodes information as a string of 1s + 0s </li></ul><ul><li>Why a Digital TV conversion? </li></ul>
  4. 4. <ul><li>Vacuum Tubes - change alternating current into direct current, increase the strength or turn current on and off </li></ul><ul><li>Ex - CRT – TVs and comp. Monitors </li></ul><ul><li>Semiconductors – a crystalline solid that conducts current only under certain conditions. </li></ul><ul><ul><li>N-type – current is a flow of electrons </li></ul></ul><ul><ul><li>P-type – appears as though positive charge flows </li></ul></ul><ul><ul><li>Joined together for a flow of electons </li></ul></ul>
  5. 5. Solid-state components <ul><li>Diodes – combine an n-type and p-type semiconductor </li></ul><ul><li>Transistors – has 3 layers of semiconductors with a small current flowing through its center (often a switch or amplifier) </li></ul><ul><li>Integrated Circuit - a thin slice of silicon built layer by layer, they are very small. AKA chips </li></ul><ul><li>What products use this? </li></ul>