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PP-SALB2-EVM: What items should come with the Learning Board 2?

Prodigy 180 points

Replies: 6

Views: 187

Part Number: PP-SALB2-EVM

I just purchased a PP-SALB2-EVM learning board to go with a TAS2557EVM evaluation board.  I need to characterize a speaker for my product and the PP-SALB2-EVM didn't come with everything needed to be able to do speaker characterizations.

The LB2 documentation (slou422.pdf) Figure 2 shows the connections for doing speaker characterization.  It shows a laser for determining the speaker excursion and a microphone for connecting to J1, the TRS Mic input.

I have a couple of problems:

1. My EVM did not come with the laser that measures the speaker excursion.  There is no documentation of what this laser is, who makes it or anything about it.

2. The microphone that came with the EVM is a Dayton Audio iMM-6 Calibrated Measurement Microphone with a 3.5mm headphone plug on the end.  This mic is designed for plugging into the headphone/mic jack on an Android or Apple phone.  There is no adapter for connecting this mic to the 1/4" jack (J1) on the LB2 board.

Questions:

1. Was the measuring laser supposed to ship with the kit?  If not, how do I get one?

2. How do I connect the Dayton Audio microphone to the LB2 board?

Thanks.

  • Hi David,

    I'll comment on your questions below:

    • The laser does not come in the PP-SALB2-EVM kit. Usually a Keyence laser is used, I can provide more details on this, although this device is not owned by TI.
    • The kit should contain the following items (among others):
      • iMM-6 Mic
      • RCA cable
      • 1/4" plug to RCA adapter
      • A PCB that contains the low-pass filter along with two PCB adapters, one of them is 3.5mm to RCA adapter
    • You should connect the iMM-6 mic to the PCB adapter, then the RCA cable to the 1/4" adapter and then connect to the learning board.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • In reply to Ivan Salazar:

    Which model/part number laser from Keyence do you use?

    Is there another way to do the speaker excursion measurements?  

    Thanks.

  • In reply to David Smith62:

    LK-H series can be used for this measurement, but you need several additional things like controller, software and cables.

    Sometimes the speaker manufacturer can provide these speaker characteristics. If that's the case you can input them, but it cannot be measured by other means.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • In reply to Ivan Salazar:

    Do you know which model of the laser, controller, etc. does TI use?

  • In reply to David Smith62:

    Hi David,

    Let me send this information on a private message.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • In reply to Ivan Salazar:

    Ivan,

    I spoke to someone at Keyence and learned about their displacement measuring lasers and also got some pricing information.

    Thank you.

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