Hello to the community.
I have 4 questions regarding a laptop power supply found in my uni's electronics dumpster where i make everyday dives
.
On its label it says that it's rated at 19.5V and 3.34A .
1. Please watch the shared video from my Dropbox, showing you, the output voltage measured from my cheap multimeter.
Is it working properly? I have no prior experience with laptop psu. It's not a stable output voltage but rather
jumping around the rated output voltage.
https://www.dropbox.com/s/urbh0la70cagx3w/video-1511783244.mp4?dl=02. The power supply has a small smd capacitor between the output terminals. What is the purpose of that? Smoothing the output voltage ?
Can i change it, maybe, with a THT or smd of another value with better results?
3. My girlfriend moved to a new house last month and the previous guy had left an LG LED pc monitor laying around with
a broken base. But without its power supply. So i want to use the above power supply for that purpose. The monitor is rated for 19V
and 1.2A . If the power supply is working properly how i can lower the output voltage to 19V and use it to test the monitor? Is it
possible to do it with resistors and what circuit should i use?
4. Is it possible to find schematics for such power supply units? There is a plethora of them.
Thank you in advance and waiting for you suggestions.