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.
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.
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.