I'm running a set of ~150 LEDs controlled by my Arduino Uno. When I connect my soldered prototype board to a 5V 10A power supply (a cheapo Amazon one) my voltmeter checking continuity changes from reading around 640 to beeping. I fried another power supply of similar build before, so I want to avoid doing so again! The circuit runs with a lower amp supply, but is not enough to run the whole setup with full brightness.
The arduino is powered separately than the LED lights by a USB wall socket. I had this running on a breadboard fine, so perhaps there is a short-circuit somewhere. I'm not too clear on what the volt meter readings mean when using continuity setting.