1. Kierunek „Elektronika”, rok II
Electroacoustics
Kierunek „Elektronika”, rok II

2. Electro-mechanical transducers
Reversible
Irreversible

3. Reversible transducers
I type T1 i v u F
II type i
1:T2 v F u

4. Transducers of 1st type

5. Transducers of 2nd type

6. Principle of the dynamic transducer (with moving wire)

7. Voice-coil dynamic transducer

8. Equivalent electrical circuit

9. Ribbon dynamic transducer
Connexion terminals
Ribbon
Magnet puller
Ribbon’s movement direction

10. Izodynamic transducer
Membrane
Terminals
Conductive path
Membrane mounting
Faceplate with holes
Magnets

11. Electromagnetic transducer (with moving armature)

12. Equivalent electrical circuit

13. Balanced electromagnetic transducer

14. Electrostatic (condenser) transducer

15. Equivalet electrical circuit

16. Electrect transducer Metallic membrane Electret Air gap
Fixed electrode

17. Balanced electrostatic transducer

18. Piezoelectric crystals
Optical axis Z
Mechanical axis Y
Electrical axis X
Plate with X-cutting
Quartz
KNT (Seignette salt)

19. Vibration types of piezoelectric plates
Compressional – longitudinal
Compressional – thickness
Shear – longitudinal
Shear - thickness

20. Equivalent electrical circuit

21. Piezoelectric bimorphs
Bending Torsional

22. Piezoresistive transducer
Housing
Membrane
Beam
Piezoresistor

23. Wheatstone’s bridge with piezoresistors

24. Coal transducer Membrane Semispherical electrode Coal pulver chamber
Fixed electrode

25. The end