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SELTECH NC52W33DF8, Руководство по дизайну


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© 2020 SELTECH - All rights reserved

4

Back volume

Using PCB as box-cover

Directly contacting to PCB

Create closed box

Contacting with flex-print

Create closed box

Contacting with contact pin

… How to connect to the speaker?

Содержание NC52W33DF8

Страница 1: ... 2020 SELTECH All rights reserved R e c o m m e n d e d d e s i g n g u i d e l i n e f o r m i c r o s p e a k e r s S E LT E C H C O N F I D E N T I A L ...

Страница 2: ...erved 2 Common Application Design Guidelines Back volume why a closed back volume how to connect to the speaker mechanical robustness acoustical influence Sound Port opening size vs Bandwidth damping acoustic load turbulence noise ...

Страница 3: ...ironment behind the speaker Well defined acoustical performance to be able to adjust the resonance frequency of the system Resonance frequency range is the most efficient range of the speaker to avoid acoustical short circuit Speaker for closed box design needed Why a closed back volume ...

Страница 4: ...LTECH All rights reserved 4 Back volume Using PCB as box cover Directly contacting to PCB Create closed box Contacting with flex print Create closed box Contacting with contact pin How to connect to the speaker ...

Страница 5: ...CH All rights reserved 5 Back volume Create closed box Contacting with contact spring Reverse application Directly contacting to PCB How to connect to the speaker back volume Sound port at rear side of the speaker ...

Страница 6: ...wall resonating depends on material Avoid wall to wall design e g antenna module Vibrations can cause rattling noise Use sandwich for applying the speaker foam gasket speaker hard support at rear side No heat radiating components inside the back volume Etc Mechanical robustness ...

Страница 7: ...rved 7 Back volume It is possible to put the RA completely down on a PCB or module housing Venting to the back is provided by 4 venting holes and slits All 4 holes should lead to a common closed back volume Back venting of RA11x15 ...

Страница 8: ...rved 8 Back volume Speaker surounded on three sides by walls will influence resonance frequency and sensitivity Additional acoustic load will reduce performance compared to a free scenario Acoustic load at the rear side of speaker ...

Страница 9: ...l rights reserved 9 Back volume Channels connecting parts of the back volume can cause peaks in frequency response Shape of volume high aspect ratio volume spaces do not constitute effective volume Acoustical influence ...

Страница 10: ... 2020 SELTECH All rights reserved 10 Back volume Leaks can cause damage to the speaker by exceeding maximum membrane excursion Acoustical influence ...

Страница 11: ... 2020 SELTECH All rights reserved 11 Sound Port Opening size vs Bandwidth ...

Страница 12: ...sions have a dramatic influence on the acoustic performance Tube length avoid sharp edges or corners that could result in audible turbulence Distance from top of speaker to housing should be at least 0 5mm to avoid audible turbulence Dimensions V1 V2 V1 V2 0 8ccm Tube 1 5x1 x 5 mm Tube 2 5x0 5 x 5 mm ...

Страница 13: ... 2020 SELTECH All rights reserved 13 Sound Port Turbulence noise Possible reasons Sound port openings too small Front volume too small Sharp edges in sound port Damping mesh on sound port too tight ...

Страница 14: ... 2020 SELTECH All rights reserved T H A N K S ...

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