BHI NEDSP1068-PCBA Manual Download Page 13 | Manualshive

Page: 13 / 13

background image

HBA09-001-70

HB-NEDSP1068

13

Appendix C - PCB Dimensioned drawing

«
...
11
12
13

Summary of Contents for NEDSP1068-PCBA

Page 1: ...te 20 08 2012 PO Box 318 Burgess Hill RH15 9NR England Tel 44 0 1444 870333 Fax 44 0 845 217 9936 info bhi ltd com www bhi ltd com NEDSP1068 PCBA NEDSP1068 PCBA MIC DSP Noise Cancelling Modules With AGC action Preamplifier on board mic option ...

Page 2: ... external Microphone Capsule or signal 6 1 2 Dynamic Microphones 6 1 3 Condenser Electret 6 1 4 External Signal Sources 6 1 5 Using external Signal Sources 6 1 6 Setting the preamplifier gain 6 1 7 AGC Settings 6 1 8 Setting the output level 6 1 9 Noise Cancellation Settings Appendix A Block Schematic and PCB Outline Appendix B Connection pin outs and Jumper settings Appendix C PCB Dimensioned Dra...

Page 3: ...68 PCBA MIC has an on board SMD microphone and the adjustable AGC MIC pre amplifier circuit 2 Specifications DSP Noise cancelling 9 to 35dB Input Power 5 18v D C Input Current 30mA Audio input level Before Preamp and AGC 4mV to 100mV p p dependent on preamp gain setting Line Input 800mV p p Input Impedance Pre amplifier 100KOhm Line in direct 10KOhm Audio Output level Adjustable from 0v to 2 0v p ...

Page 4: ...holes are not part of the board grounding mechanism Note Both module versions are supplied with all jumpers and links open Before powering up the module ensure that all the jumper links have been set correctly for your application and microphone type In all cases except when using the line level input from pin 9 J2 the PRE jumper link must be soldered 4 External Overload Indicator The module has c...

Page 5: ...ix A on page 11 Ensure that the PRE jumper is soldered and the MIC jumper is open The Pre amplifier Gain setting needs to be set to 60 dB links A B open see section 6 1 6 The microphone connections are then made to MIC IN J4 pin 1 and MIC GND J4 pin 3 respectively 6 1 3 Condenser Electret Microphones Electret microphones need to be biased either via the third pin or via the microphone input lead B...

Page 6: ...ldered Open 50 dB Open Soldered 60 dB Open Open 6 1 7 AGC Settings Attack and Release Time Setting The AGC has an attack time set by C27 C31 which can be selected with the AT link The AT link is not soldered for standard the factory setting and the A R links will be left open setting the Attack Time to 0 11mS and the Release Time to 55Ms which should be adequate for normal use However for more noi...

Page 7: ...f R16 6 1 8 Setting the output level Whilst the modules have been preset during manufacture you will probably need to carry out minor adjustments to ensure that you have the required output level and the best response under all signal conditions for your application With the module connected to your system apply power and check the audio performance Before going any further reduce the noise cancel...

Page 8: ...Noise cancelling settings Jumpers J5 through to J7 select the level of noise cancellation see the table below For most operations level 4 is quite adequate but for more severe conditions the level may be increased to 5 6 or 7 It will be found that under certain high noise conditions and with poor speech quality levels 7 and 8 can cause the audio quality to be rather mechanical with musical tones b...

Page 9: ...HBA09 001 70 HB NEDSP1068 9 Appendix A Block Schematic and PCB outline ...

Page 10: ...HBA09 001 70 HB NEDSP1068 10 PCB outline showing top side of PCB and user link pads R7 may be found on the reverse side of this PCB as shown opposite On Board microphone R7 location ...

Page 11: ...l ON OFF Selected when High 9 Audio In or I External Line Input Maximum 900mV input 10 Audio Out or O Audio Output Variable output up to 2 5v p p J4 External Microphone and indicator Port Pin Designation Use Operation 1 In or I External Microphone External Microphone or low level audio input 2 V or Microphone Supply Separate Bias Supply 3v3 3 pin electrets 3 Gnd or Microphone Ground Ground 4 Scr o...

Page 12: ...5 X X 6 X 7 X 8 X Jumpers require fitting to obtain the level Remove all jumpers if the module is to be used with an external controller such as the KBD version or via J2 pins 1 2 3 and 8 Note By grounding Pin 8 of J2 audio at the input to the DSP will be passed directly through the DSP to the output without being processed by the Noise Cancellation Algorithm Optional Connector J1 For use with boa...

Page 13: ...HBA09 001 70 HB NEDSP1068 13 Appendix C PCB Dimensioned drawing ...

Reviews:

No comments

Related manuals for NEDSP1068-PCBA

vlt soft starter mcd 500

Brand: Danfoss Pages: 95

Brand: Danfoss Pages: 12

Brand: Danfoss Pages: 33

Brand: Danfoss Pages: 59

Brand: Danfoss Pages: 16

VLT AQUA Drive FC 200

Brand: Danfoss Pages: 91

Brand: Danfoss Pages: 2

Brand: Danfoss Pages: 100

Brand: Danfoss Pages: 82

Brand: Danfoss Pages: 18

Brand: Danfoss Pages: 12

OPTYMA Plus OP-LPQM

Brand: Danfoss Pages: 8

Brand: Hach Pages: 2

Brand: Hach Pages: 12

Brand: Hach Pages: 472

Brand: Hach Pages: 64

Brand: V2 ELETTRONICA Pages: 6

Brand: Hach Pages: 210

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands