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Thread: power, bluetooth, some guys law about ohms

  1. #1
    PSB Statesman Dubs's Avatar
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    power, bluetooth, some guys law about ohms

    So in the last few years I have started to become a 'maker' of sorts, creating anything from cufflinks to cutting boards.

    I am a novice with electronics so please dont throw around too many technical terms - I am however, willing to learn.

    I recently purchased an AMP BOARD to build a portable bluetooth speaker.

    I got it last weekend and plugged it in to mains using a an old 12v power plug and it worked a treat.

    My goal is to have it self powered and portable.
    My thinking was to have a cheap power bank inside the enclosure, tap into that and add an on/off switch and power it with a single 18650 battery BOOM, DONE.
    Therefore power bank charges via normal micro connection or the like and also feeds the amp and speakers when the power switch is ON.

    Testing last night didnt work with the single battery. It seems an 18650 is 3.7v and I need at least 12v to power this thing at least to start up (or do I?).

    Google fu and YouTube reading tells me I will need at least:
    4 x 18650 connected in SERIES
    A BMS (?) to regulate the power output and also charging - or some shit
    A step up power converter? for some reason

    Can anyone help with what may be a solution to this considering portability, price point and weight? And provide links so i can read/purchase

    thanks

    Dubs

    Specs of the amp:
    Feature:
    Chip: TDA7492P
    Power: 2.1 interface 8-25V DC power supply
    Audio input: CSR8635 Bluetooth chip, Bluetooth V4.0(stereo input various versions of the bluetooth connection)
    Output impedance:8Ω is best(can drive 4,6,8,16Ω impedance speaker)
    The dial switch can be much more convenient to directly adjust the rear stage amplifier gaining ,then better promoting the impedance and louder speaker

  2. #2
    Member Water pig's Avatar
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    Going by the specs you’re needing 8-25 volts dc to run it. I don’t know anything else to help

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