Recent content by cdxer

I have tried 3 PC power supplies. a 250W 5V rail rated at 15A is 5.2V open, and loses 2V on 0.33Ohm load a 300W 5V rail rated at 20A is 5.2V open, and loses 1.5V on 0.33Ohm load a 500W 5V rail rated at 30A is 5.2V open, and loses 0.5V on 0.33Ohm load I have tried 2 LED/CCTV power supplies...

That won't make a difference since they are the same nodes. I've come to believe that it's simply an advertising mechanic. It is capable or 5V, or 40A, but not at the same time. Just like how disk space is sold by gigs division by 1000 instead of 1024. I think my solution would be to find a 7V...

Sorry, the supply is actually 4.5V to 5.5V at 40A, 200W. That's my mistake. However, it doesn't come close to 40A. These laser diodes are rated at 5V 30mA. The reason I am not using a 12V is to avoid having 230 resistors. The supply is barely able to power even 30x diodes at a time without...

The eBay power supply is described as 5V 70A 200W, adjustable from 4.5V to 5.5V. With a 0.33Ohm resistor, the voltage drops to about 4V from 5.5V adjustment. Simple case of false advertisement?

No, the current is coming straight from the power supplies. The problem is not current protection but lack or current because every power supply I use have a massive voltage drop on a heavy load.

I am trying to power 230x Laser diodes at 30mA each. Applying 5V to each would accomplish this. However, I've converted two PC Power Supplies to general purpose power supplies and neither of them were able to support the required current. They would drop from 5V to maybe 3.5V at around...