Transducer

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A transducer is a device that converts one type of energy to another, or responds to a physical parameter. A transducer is in its fundamental form a passive component. If the component is electrical then it generally has two electrical terminals.

List of transducers

Electrochemical:
Electromechanical:

- Electroactive polymers
- galvanometer
- MEMS
- motor, linear motor
- piezoelectric
- quartz
- relay
- servomechanism
- strain gauge used in weight/force measuring.
- switch
Electroacoustic:
- gramophone pick-up
- hydrophone – converts changes in water pressure into an electrical form
- loudspeaker, earphone – converts changes in electrical signals into acoustic form
- microphone – converts changes in air pressure into an electrical signal
- piezoelectric crystal – converts pressure changes into electrical form
Photoelectric:
- Laser diode, light-emitting diode – convert electrical power into forms of light
- photodiode, phototransistor – converts changing light levels into electrical form
- solar cell – converts light energy into electrical energy
Electromagnetic:
- antenna (electronics) – converts airborne RF signals into electrical form
- cathode ray tube (CRT) – converts electrical signals into visual form
- fluorescent lamp, light bulb – converts electrical power into visible light
- magnetic cartridge – converts motion into electrical form
- photocell or light-dependent resistor (LDR) – converts changes in light levels into resistance changes
- reed switch – converts a strong magnetic field into a switch activation
- tape head – converts changing magnetic fields into electrical form
Magnetic:
- Hall effect sensor – converts a magnetic field level into electrical form
Electrostatic:
- electrometer
- liquid crystal display (LCD)
Thermoelectric:
- thermocouple
- Peltier cooler
- thermistor (includes PTC resistor and NTC resistor)
Other:
- Geiger-Müller tube used for measuring radioactivity.
Electronic. These components change one electrical parameter in response to another. By some definitions these are electronic components, not transducers.
- diode
- gyrator
- varicap diode, varactor diode, tuning diode
- negative impedance converter, NIC
- Schottky diode
- transistor, Field effect transistor (FET)
- Transorb
- tunneling diode
- varistor
- voltage-dependent resistor
- Zener diode
Electrical. These components change one electrical parameter in response to another. By some definitions these are passive electronic components, not transducers.
Mechanical.
- gear

Sources/references

The Danish Wikipedia

External links

Categories: Transducers | Electrical components