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djgeojoe 05/05/2020
Does what it's supposed to but it does drop voltage slightly at the output terminals when under heavy load (5-7A). So if you need this for voltage accuracy I would try something else. If you need a quick and dirty power supply for some experiments this may prove useful but a quality lab supply it is definitly not. The cooling fan does not appear to work but perhaps it will turn on as the power supply heats up. I did run it on a load at 12V 10A for a short period of time and the fan did not come on. Also when drawing over 10A the power supply does not seem to protect itself, it starts squealing loudly (but no damage), I think it folds back the voltage but I did not want to push it too hard to find out. Also when setting constant current the power supply squeals after 250mA then is silent after 5A, this is just strange, probably due to poor internal components or possibly a bad or cheap design. The meters are fairly accurate at no load but like I said under heavy load the output voltage drops but the voltage output display remains the same, I may disassemble the unit and add heaver internal AWG wires from the PCB to the output terminals, this may improve performance. The input mains power switch was set to 220V so if you are in the USA like me, you should look at that first like I did. The provided DC cables are inadequate for the output of this supply but can be used for low power tasks, I will be using my own 10AWG silicone cables for this unit. The alagater clips are slippery silicone and the clamps are well made (tough) but they will slip around while trying to squeeze them. They are also not soldered (just crimped) so I would add solder to them for long life and improved continuity. Conclusion: For the price you can not go wrong with this unit, I would buy another if needed but it may require some modification for improved performance. The size is nice and small and the added Watt meter is very nice for quick reference. Ditch the provided leads.
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