basic electronics2

basic electronics2 - ELECTRONICS ELECTRONICS Frost Alarm...

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Unformatted text preview: ELECTRONICS ELECTRONICS Frost Alarm ELECTRONICS ELECTRONICS When the thermistor temp is high the resistance is low and the transistor is off. ELECTRONICS ELECTRONICS Frost Alarm ELECTRONICS ELECTRONICS When the thermistor temp is low , the resistance is high and the transistor switches on. ELECTRONICS ELECTRONICS Fire Alarm ELECTRONICS ELECTRONICS When the temp is hot the thermistor resistance is low so it takes little voltage and so the resistor takes most of the voltage and so the transistor switches on. ELECTRONICS ELECTRONICS Fire Alarm ELECTRONICS ELECTRONICS When the temp is cold the thermistor takes most voltage and so the resistor takes little and the transistor is off. ELECTRONICS ELECTRONICS Burglar Alarm ELECTRONICS ELECTRONICS When the L.D.R. is in the light ,the resistance is low so the voltage is low and the transistor is off ELECTRONICS ELECTRONICS Burglar Alarm ELECTRONICS ELECTRONICS When the L.D.R. is in the dark its resistance is high and the transistor switches on. ELECTRONICS ELECTRONICS Time Delay Circuit ELECTRONICS ELECTRONICS When the capacitor charges up to a certain voltage after a certain time , the transistor switches on. ELECTRONICS ELECTRONICS ELECTRONICS ELECTRONICS There are 3 process devices, The NOT gate The AND gate The OR gate ...
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This note was uploaded on 11/08/2011 for the course PHYSICS 121 taught by Professor Richardvanfleet during the Winter '09 term at BYU.

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