DX » Community » Reviews » BaoFeng BL-5 Car Battery Eliminator for UV-5R Walkie Talkie - Black + Silver (DC 12V)
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  • Effective product

    posted by gamma8 on 08/06/2013
    0

    Involvement:General (knows how to use it) - Ownership:1 week to 1 month

    Pros:

    It's simply a housing for a lithium ion battery with a hole drilled in the bottom for the cable. Inside is a linear regulator (L7808) and two electrolytic capacitors mounted on a circuit board. The regulator is mounted on a piece of aluminum to dissipate heat. The cigarette lighter plus has an included fuse.

    Cons:

    There may be a con. I'm not sure which will get hot first, the regulator or the transmitter part of the radio (when

    transmitting). A more efficient regulator would be a switching type, but that would be more expensive, but the

    switching regulator might be more electrically noisy.

    OtherThoughts:

    Listening to an FM radio station at full volume I measured around 300mA. So 18.8V-8V=5.8V, 5.8Vx0.3A = 1.74Watts in heat. Transmitting was about 0.8A, so 5.8Vx0.8A = 4.64Watts in heat output from the regulator chip.
    It could be run run from a higher voltage than a car (13.8V) if you wanted to modify it to improve heat dissipation.

    Bottomline:

    A way to get longer usage of the Baofeng instead of using the battery.

    • The regulator circuit
    • The Battery Eliminator opened up
    • The Battery Eliminator opened up
    • Inside the Battery Eliminator, showing the LM7808

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