Transducers

The light emitting diode, light dependent resistor, thermistor and reed switch are all examples of transducers. Transducers transform energy from one form to another. Transducers act as input devices, changing some form of energy into electrical energy, which is fed into some processing circuit, producing an output which is fed to another transducer and changed into some useful output or signal. Often this is so that an alarm can be sounded or something can be switched on or off automatically. The basic arrangement of such circuits is shown below.

Input Transducers (Sensors)


Processors


Output Transducers

Transistors

Amplifiers

Logic Circuits



Light Emitting Diode

Relay

Buzzer

Loudspeaker

Motor

Meter

Cathode Ray Oscilloscope



Reed Switch

Light Dependent Resistors

Thermistor

Microphone

Tape Head



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