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Transducer Driver


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  GCSE    Transducers  0 of 12    Question 252    Components 
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Deadline not set1 of 12    Question 1035    Robot Inputs 
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Deadline not set2 of 12    Question 1032    Robot Outputs 
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Deadline not set3 of 12    Question 1033    Robot Outputs 
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Deadline not set4 of 12    Question 1034    Robot Outputs 
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Deadline not set5 of 12    Question 1024    Robotic Vision 
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Deadline not set6 of 12    Question 1026    Robotic Vision 
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Deadline not set7 of 12    Question 1023    Robotic Vision 
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Deadline not set8 of 12    Question 1086    Robots and Machines 
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Deadline not set9 of 12    Question 1501    Transducer Buzzer 
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Deadline not set10 of 12    Question 266    Transducers 
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Deadline not set11 of 12    Question 279    Transducers 
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Deadline not set12 of 12    Question 283    Transducers 
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Deadline not set  Questions 0 to 12   -->  View All  

Small signals from processing devices often need to be boosted by a DRIVER before connection to an output transducer.

For example, street lights might be controlled by a small light sensor connected to a 40106 chip. This chip has a maximum output current of around 10mA at 5 Volts DC. The street lamps probably run on 230 Volts AC with a current of 400mA per light.

INPUT -  The input sensor is the LDR.

PROCESS -  The Schmitt NOT gate is the processor.

DRIVER -  The transistor switch is a driver. The relay could also classed as a driver.

OUTPUT -  In this case, the lamps are the output transducers. They convert electrical energy into light.

Transducer Driver

A light sensing voltage divider made from the LDR and 4K7 resistor is connected to the Schmitt NOT gate. On its own this can't drive the street lights. It can't even drive the relay.

The NPN transistor acts as a switch, turning the relay on or off.

The relay is capable of switching the 230 V AC current for the street lights.

 

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