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Transistor & Voltage Divider

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Presentation on theme: "Transistor & Voltage Divider"— Presentation transcript:

1 Transistor & Voltage Divider
JC Technology Transistor & Voltage Divider

2 Transistor & Voltage Divider
Transistor: electrical switch Three leads: emitter, base, collector

3 Transistor & Voltage Divider
Switch on transistor: Base voltage > 0.6V Small base current gives large collector current Small base current Large collector/emitter current b c e

4 Transistor & Voltage Divider
Voltage Divider: resistors in series divides the applied voltage Base voltage < 0.6V Transistor off Base Voltage > 0.6V Transistor on

5 Transistor & Voltage Divider
Transistor Circuit Output LED/Bulb/motor etc. Input Voltage divider Process Transistor Base Voltage

6 Transistor & Voltage Divider

7 Transistor & Voltage Divider
LDR – output controlled by light levels Light = low resistance = low voltage Dark = high resistance = high voltage

8 Transistor & Voltage Divider
LED on in daylight

9 Transistor & Voltage Divider
LED on in daylight Variable resistor sets light level

10 Transistor & Voltage Divider
LED on in darkness Variable resistor sets light level

11 Transistor & Voltage Divider
Thermistor – output controlled by temperature levels Hot = low resistance = low voltage Cold = high resistance = high voltage

12 Transistor & Voltage Divider
Thermistor – output controlled by temperature levels Variable resistor sets temperature level

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