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GCSE     Transducer     Battery     Bulb     Buzzer     Driver     Loudspeaker     Microphone     Motor     Neon     Piezoelectric Sounder     Servo     Seven Segment     >Solenoid<    

Transducer Solenoid


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  GCSE    Transducers  0 of 12    Question 252    Components 
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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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Input: Electric current
Output: Mechanical movement in a straight line.

Electromagnetic Solenoid Linear Actuator      Electromagnetic Solenoid Linear Actuator

Here is a simple example.
Inside the metal frame, there is a coil of copper wire.
When a current is passed through the coil, it becomes
magnetised and the moveable iron core is pulled into the coil.

This movement can be used to ...

Solenoid Driver Circuit

Solenoids are inductive (contain an electromagnet) and they produce a large back EMF if the current flowing is suddenly turned off. To prevent this, put a diode in parallel with the solenoid. This allows the current to die away slowly and the large back EMF is prevented. This also prevents damage to the driver circuit controlling the solenoid.

Electromagnetic Solenoid Transducer Driver

In this simulation, note the slow current build-up and decay through the diode.

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