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Thread: Power Supply Bench Testing Question

  1. #1
    Variable Bitrate
    Join Date
    Jul 2004
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    329

    Question Power Supply Bench Testing Question

    I hope this is the right section. I am trying to bench test a aftermarket radio and I was going to use this cheapo jump starter I have for power. I hooked my multimeter up to the jump starter and got a reading of about 13v. I know I am supposed to connect both the red and yellow to the positive (+) and the black to the negative (-) and it should start. However, at 13v, is it safe to hook the radio up or should I wait until it goes down below 12v? It being a cheapo jump starter it doesn't hold a charge that well.
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  2. #2
    Raw Wave
    Join Date
    Nov 2009
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    2,119
    A 12V car radio should handle up to 16V.
    Cars are rarely as low as 12V - when driving/charging, they normally range between 13.6 & 14.5V.

    It is confusing.
    A "12V" battery is normally 12.67V fully charged; can be 13.6V after charging (with surface charge remaining); is considered fully discharged at ~11.4V unloaded/open circuit but that may mean 10.6V at rated loads, and cranking may dip them as low as 9 or 8 Volts.

    Hence an (or my?) oldskool common design target was that devices should work between 8V and 16V steady-state - or at least not be destroyed between those ranges!

  3. #3
    Variable Bitrate
    Join Date
    Jul 2004
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    Ok thanks OldSpark, do I need to put a fuse on the red wire or is the fuse on the yellow wire good enough?
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  4. #4
    Raw Wave
    Join Date
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    Normally ALL wires connected to a power supply are fused - that's to protect the wires.
    Last edited by OldSpark; 03-16-2011 at 10:17 AM.

  5. #5
    Variable Bitrate
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    Ok thanks.
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