Load Question

Discussion in 'General Electronics Chat' started by Boka, Aug 4, 2005.

  1. Boka

    Thread Starter Active Member

    Apr 21, 2004
    36
    0
    Hello everyone,

    Got a device that requires a 15V 125mA DC supply but i have a 1000mA 15V DC adapter laying around the house My question is will my device be fine if i use my adapter.

    :)
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Yes. This will work.

    Your supply is able to provide more current than your device will draw.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    The little wall transformers tend to be poorly regulated. The one capable of an amp may exhibit a voltage higher than the desired 15 with only 1/8th the rated load. Check with a meter if you can. If it's putting out 17-18 volts, it may damage your load.
     
  4. Boka

    Thread Starter Active Member

    Apr 21, 2004
    36
    0
    hello

    So that means that i should check the maximum current that it could handle then, Ive traced the supply part and it goes into a LM317 connected in parallel to LM7805, so does the current limit add up/divide or do i go with the one with a lower current limit when i selesct a adapter. Ive use a DMM and it reads 125mA when the device is on.
     
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