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DIY Bluetooth Speaker: Power Supply, 12V Battery, Amplifier, Inverter & Stabilizer Options

Patelniak20 7083 16
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Can I power a DIY Bluetooth speaker with lithium batteries instead of a 12V supply/stabilizer, and will a tablet battery or 5V USB converter work with a PAM8610 amplifier?

Use a proper lithium battery pack for the speaker, not a linear stabilizer or a 5V USB inverter, and make sure the pack can supply enough current and be charged with a suitable external charger/BMS [#16720385][#16720856] For the PAM8610 class-D amplifier, each 15 W channel needs at least 12 V; with lower voltage you will get less power [#16721736] A tablet battery marked 5 V / 2 A / 4000 mAh is not enough, because it contains only one or two lithium cells [#16721489] If you build the pack from loose cells, use a single Li-ion cell, cells in parallel for more capacity, or cells in series with a balancer; two 3.6 V cells in series would only give 7.2 V [#16720856][#16722342]
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  • #1 16720343
    Patelniak20
    Level 7  
    Posts: 7
    Rate: 1
    Hello !!!
    I have a question about bluetooth speaker power supply. I was inspired to make my own speaker, I searched on forum and youtube and found a movie (I added the title to the attachment because I can't add links to posts yet)

    I found this video and I want to do something similar but I would like to change a few things and now I have some questions.
    1. Can I put batteries into the basket instead of the modeling battery so that this 12V comes out and connect it all in series to the amplifier
    And the second question is whether instead of this stabilizer I can use such an inverter from the charger to the cigarette lighter there I have 2x USB
    And I also wanted to ask if this question batteries are suitable or better to give it a rest (photo of the battery also in the attachment)
    This will be my first project of this type so I don't know anything about it, but there are willingness, thanks in advance for any help.
    Please, if you have any other suggestions please write :D
    Attachments:
    • DIY Bluetooth Speaker: Power Supply, 12V Battery, Amplifier, Inverter & Stabilizer Options Screenshot_2017-09-25-16-52-02.png (1.41 MB) You must be logged in to download this attachment.
    • DIY Bluetooth Speaker: Power Supply, 12V Battery, Amplifier, Inverter & Stabilizer Options Screenshot_2017-09-25-16-50-17.png (1.04 MB) You must be logged in to download this attachment.
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    #3 16720385
    jdubowski
    Tube devices specialist  
    Posts: 21595
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    Patelniak20 wrote:
    Instead of modeling battery, can I throw batteries into the basket so that this 12V comes out and connect it all in series to the amplifier


    You can if:
    - the batteries have adequate current capacity
    - you will charge them with an external charger after removing from the basket
    Note that batteries after PLN 2 in many cases are only suitable for the bucket with the words "Waste treatment".
    Patelniak20 wrote:
    And the second question is whether instead of this stabilizer I can use such an inverter from the charger to the cigarette lighter there I have 2x USB

    In principle, only a converter will be suitable for battery operation, a linear stabilizer is a conceptual error - wasting limited energy.
    As above - check if the converter will "leak" in current.
    Patelniak20 wrote:
    And I also wanted to ask if this question batteries are suitable or better to give it a rest (photo of the battery also in the attachment)

    What is "pyt"?
  • #4 16720448
    Patelniak20
    Level 7  
    Posts: 7
    Rate: 1
    In that case, what do you think will be best to power such a speaker so that I do not have to remove the battery every time?
    I wanted to use 2x15w speakers but I need a big battery to play a few hours.
  • #5 16720748
    rellikoidaR
    Level 11  
    Posts: 49
    Help: 2
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    I obtain 18650 cells from "broken" laptop batteries. After dismantling several batteries, it turned out that a maximum of two out of six cells are useless or all functional and electronics free. I power them with a demanding SSTC and metal detector. They really do well. Charging off device.
  • #6 16720856
    jdubowski
    Tube devices specialist  
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    Patelniak20 wrote:
    In that case, what do you think will be best to power such a speaker so that I do not have to remove the battery every time?


    Either a single lithium cell or a pack of lithium cells connected in parallel. Or the cells connected in series with the appropriate balancer added.

    Patelniak20 wrote:
    I wanted to use 2x15w speakers but I need a big battery to play a few hours.


    What amplifier?
  • #7 16720985
    398216 Usunięty
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    Patelniak20 wrote:
    I wanted to use 2x15w speakers
    This information says nothing about energy demand. It is important what power and in what class (AB or D) you plan to use the amplifier. This amplifier draws power and the speakers can have even 1000W - at most they will not play their full potential.
    Enter the amplifier model and speaker resistance.
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  • #8 16721465
    Patelniak20
    Level 7  
    Posts: 7
    Rate: 1
    398216 Usunięty wrote:
    Patelniak20 wrote:
    I wanted to use 2x15w speakers
    This information says nothing about energy demand. It is important what power and in what class (AB or D) you plan to use the amplifier. This amplifier draws power and the speakers can have even 1000W - at most they will not play their full potential.
    Enter the amplifier model and speaker resistance.


    2x15W PAM 8610 class D amplifier
    Added after 2 [minutes]:
    And could the battery from the old tablet be used? I mean, I don't have to take it out every time I want to charge the speaker.
    The battery from the tablet has 5V / 2A. 4000mAh
  • #9 16721468
    jdubowski
    Tube devices specialist  
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    Patelniak20 wrote:

    2x15W PAM 8610 class D amplifier


    What speaker impedance and what voltage do you want to power the PAM with?
  • #10 16721489
    Freddy
    Level 43  
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    Patelniak20 wrote:
    The battery from the tablet has 5V / 2A. 4000mAh
    Certainly not enough, because there are one or two lithium cells.
  • #11 16721500
    Patelniak20
    Level 7  
    Posts: 7
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    Unless I should buy some other amplifier
  • #12 16721736
    398216 Usunięty
    Level 43  
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    Patelniak20 wrote:
    Unless I should buy some other amplifier
    Each 15 W amplifier in the channel must be supplied with at least voltage = 12V.
    Less voltage means less power. It would be possible to give a converter increasing the voltage, but this in turn is a larger current (the product of U * I must be preserved - plus losses), and therefore shorter operation ...
  • #13 16722327
    Patelniak20
    Level 7  
    Posts: 7
    Rate: 1
    And if such a battery is suitable to power the speaker, I wanted to try connecting 2x50w speakers but I do not know what amplifier to choose
    Attachments:
    • DIY Bluetooth Speaker: Power Supply, 12V Battery, Amplifier, Inverter & Stabilizer Options 20170926_175139.jpg (5.25 MB) You must be logged in to download this attachment.
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  • #14 16722342
    Freddy
    Level 43  
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    These are two pieces of lithium cells 3.6V each, so they will give 7.2V in series.
  • #15 16722514
    Patelniak20
    Level 7  
    Posts: 7
    Rate: 1
    Freddy wrote:
    These are two pieces of lithium cells 3.6V each, so they will give 7.2V in series.


    Yes, but is it enough to power two 50W speakers?
  • #16 16722536
    Freddy
    Level 43  
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    Have you read all the previous posts and understood them?
  • #17 16722546
    398216 Usunięty
    Level 43  
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    Help: 3914
    Rate: 9190
    Freddy wrote:
    Have you read all the previous posts and understood them?
    I doubt it ...
    So I will ask - how do I write so that the meaning of post # 7 arrives?
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Topic summary

✨ The discussion revolves around building a DIY Bluetooth speaker, focusing on power supply options, specifically the use of 12V batteries, amplifiers, and inverters. The user inquires about substituting a modeling battery with standard batteries and whether an inverter from a car charger can replace a stabilizer. Responses emphasize the importance of using batteries with adequate current capacity and suggest using lithium-ion cells, particularly 18650 cells, for their efficiency. The PAM 8610 class D amplifier is mentioned, with discussions on the required voltage and power for optimal performance. Concerns about using a tablet battery (5V/2A) for powering the speaker are raised, with suggestions that it may not provide sufficient power for higher wattage speakers. The conversation highlights the need for proper voltage and current management when selecting components for the speaker project.
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FAQ

TL;DR: For 15 W × 2 class‑D builds, plan on ~12 V supply; “Less voltage means less power.” Use a DC‑DC converter, not a linear stabilizer. [Elektroda, 398216 Usunięty, post #16721736] Why it matters: This FAQ helps DIYers choose safe, efficient power and charging for Bluetooth speakers without trial-and-error.

Quick Facts

What voltage do I actually need for a 2×15 W amplifier?

Use about 12 V if you want a real 15 W per channel. Lower voltage reduces output power. As one expert puts it, “Less voltage means less power.” Boosting voltage from a low‑voltage pack raises current draw and shortens runtime. [Elektroda, 398216 Usunięty, post #16721736]

Can I power it with a tablet battery (5 V, 4000 mAh)?

No for 2×15 W targets. A tablet pack is one or two lithium cells and cannot meet the voltage/current for that output without heavy conversion losses. It suits smaller, low‑power modules, not a 15 W × 2 build. [Elektroda, Freddy, post #16721489]

Are two 18650 cells enough, and what voltage will I get?

Two 3.6 V Li‑ion cells in series give ~7.2 V nominal. That voltage is below the ~12 V often used for full 15 W per channel, so expect reduced power or the need for a boost converter, which cuts runtime. [Elektroda, Freddy, post #16722342]

Should I use a linear stabilizer or a DC‑DC converter?

Use a switching DC‑DC converter. A linear stabilizer turns precious battery energy into heat. “A linear stabilizer is a conceptual error.” Also check the converter’s quiescent (leakage) current to avoid standby drain. [Elektroda, jdubowski, post #16720385]

How can I charge without removing the battery pack?

Design for charging in place: use a single lithium cell or multiple cells in parallel, or if you stack cells in series, add a proper balancer. Parallel packs simplify charging; series packs need managed balance during charge. [Elektroda, jdubowski, post #16720856]

Can I salvage 18650 cells from laptop batteries for my speaker?

Yes, many laptop packs contain usable cells. Builders report that several cells per pack test fine and power demanding projects. Charge them outside the device or with a proper charger, and test capacity first. [Elektroda, rellikoidaR, post #16720748]

Do speaker "50 W" labels tell me my battery needs?

No. Speaker wattage does not dictate battery draw. The amplifier’s power and class set energy needs. Give amplifier model and load impedance when planning power. The amp consumes power; speakers only determine achievable loudness. [Elektroda, 398216 Usunięty, post #16720985]

What happens to runtime if I boost voltage from a low‑voltage pack?

Runtime drops. A boost converter keeps power roughly conserved (U×I), plus conversion losses. Raising voltage means higher current from the battery for the same output, so it empties faster. [Elektroda, 398216 Usunięty, post #16721736]

Can I use AA batteries in a holder to reach 12 V?

You can, but only if the cells have adequate current capability and you’re willing to remove them for external charging. Cheap cells are a false economy and often unusable for such loads. [Elektroda, jdubowski, post #16720385]

How do I size a battery for several hours with 2×15 W class‑D?

Plan for cells with adequate current and consider parallel packs for capacity. Use a single cell or parallel cells for easier in‑place charging, or add a balancer if you go series. Higher voltage needs rise with desired output. [Elektroda, jdubowski, post #16720856]

What is a balancer and when do I need one?

A balancer ensures series‑connected lithium cells charge evenly. Without it, cells drift, risking overcharge or early cutoff. Use one whenever you connect lithium cells in series in your pack. [Elektroda, jdubowski, post #16720856]

Is it realistic to run two 50 W speakers from a small 2‑cell pack?

Not for full power. ~7.2 V from two cells is low; achieving higher output requires boosting, which increases current draw and reduces runtime. For higher power, plan higher supply voltage and capacity. [Elektroda, 398216 Usunięty, post #16721736]

What’s an easy 3‑step way to build a safe lithium supply for a DIY speaker?

  1. Choose a single cell or parallel pack for simple charging; or series cells with a balancer.
  2. Add an appropriate amplifier that matches your supply choices.
  3. Integrate charging/balancing hardware before enclosure assembly. [Elektroda, jdubowski, post #16720856]

Any edge cases I should avoid when buying cells?

Avoid ultra‑cheap cells. As one expert warns, budget cells can be “only suitable for the bucket” and will disappoint or fail under load. Buy reputable cells and verify capacity. [Elektroda, jdubowski, post #16720385]
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