Electronic/Software: Inexpensive MP3 Player! - Page 3
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  1. #21

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    I'm considering getting one of these but how do you power it? Do you need to buy a separate power source?

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  3. #22
    Join Date
    Jul 2011
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    Brisbane (AU)
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    You can power them with any 5V source such as a common phone charger.
    Projects: da-share.com YouTube: da-share

  4. #23

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    And from the looks of it the speakers need to be hard-wired in? There's no way to just plug in an audio cable?

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  6. #24
    Join Date
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    If you have active speakers (that plug into power) you an use the 3.5mm socket. If you have bare speakers (like from a car stereo, etc) you can wire them into the 2 way terminal block. Super easy.
    Projects: da-share.com YouTube: da-share

  7. #25

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    Inexpensive MP3 Player!
    Quote Originally Posted by Rustie View Post
    I'm considering getting one of these but how do you power it? Do you need to buy a separate power source?
    David answered this question pretty well! I am planning on using this 10 port USB charger to power the players I'll have going.

    Quote Originally Posted by Rustie View Post
    And from the looks of it the speakers need to be hard-wired in? There's no way to just plug in an audio cable?
    Quote Originally Posted by David_AVD View Post
    If you have active speakers (that plug into power) you an use the 3.5mm socket. If you have bare speakers (like from a car stereo, etc) you can wire them into the 2 way terminal block. Super easy.
    David again is correct, HOWEVER, it's only a 3W amp, so you're not going to get much volume out of it with your average passive speaker (like the ones you often find in props or in home theater speaker systems). Likely enough output for a small prop, but not enough volume to carry the soundtrack from a room.

    EDIT: I stand corrected! This amp can really drive. I connected it to a small bookshelf speaker with an 86db sensitivity (fairly average in these types of speakers) and the MP3 player managed to get it remarkably loud with only 3 watts! Distortion is inevitable at any loud volume, however.


    The only reason I didn't know this before is because I had only tested it via the 3.5mm line out into a dedicated multi-channel amplifier, then made an erroneous assumption based on information I thought was correct. Sorry!

  8. #26
    Join Date
    Jul 2011
    Location
    Brisbane (AU)
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    200

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    Yeah, they are surprisingly powerful little boards. I have them running at less than full output in most of my props.
    Projects: da-share.com YouTube: da-share

  9. #27

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    These boards do work when powered on. A relay would trigger power on. You also need a time delayed realy that goes to the millisecond. You have to find the sweat spot from time delay (sound) to activation. You set the time delay to x then when x ends it activates y.

    X 2.4 seconds(powered on but idle)

    Y when 2.4 finishes(plays sound)

    Don't expect crazy sound from them. I have built many pnuematics with them.

  10. #28

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    Inexpensive MP3 Player!
    I've made 5 modules using these, a teensy, senor and 120V relay. I use a teensy to turn on the power to the mp3 and relay by a motion senor. I use a an mplifier to improve the sound.

    34782480_143119213219626_4772715397600247808_n.jpg

    This mp3 goes in the a VU level detector to the teensy that drives the servo for the jaw.

    https://www.facebook.com/haunted.pir...5423065322573/

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