Review on 💡 Efficient Monitoring of 220VAC DC12V Industrial Transformer with Supply (SMPS) by Dylan Goins

The first power supply arrived bent and something was dangling inside so I sent it in for a replacement. Then I noticed the warranty seal was broken (probably due to drop shifting) so I took it apart to see what was dangling there. It was one of two large input filter capacitors that fell out during soldering - see pic. The photos in the seller's description show that there is some glue underneath these capacitors that might hold this capacitor in place. I checked the solder joints and while it wasn't bad, there were a couple of large solder joints that seemed a bit cold. I put it back together and sent it back bent and broken. When the plugin arrived I inspected it - everything seemed fine - so I turned it on and FSSST-BAM! No, I'm joking - everything is fine! However, I quickly found that I was having a hard time adjusting it between 11.95 and 12.05V. Yes, I know this is a 12V power supply, but others had no problem using 13.8V achieve what I wanted. Also, my unit doesn't cover the full 12V + 5% as advertised, so it doesn't technically match the seller's specs. Not wanting to deal with another return I voided the warranty and opened it up. Nothing looked out of place and the soldering looked better, but I've touched up the worst spots anyway, especially the large covers and screw terminals. I then replaced the 1K voltage adjustment potentiometer with 5K and connected 22K in parallel to the bottom of R22 (10k - see image) and reassembled. Now it regulates from about 10.8V to 15V, which I'm very happy with. I think it would be safe, especially as my application only requires about 30A and also the electrolytic output filter caps are rated for 16V. If I plan to use it for a long time and at elevated temperatures I would consider replacing them by capacitors rated at 25V. I then tried the power supply in its target application, which powers the DC motor and water pump controller. The pump draws current ranging from about 1 amp to about 28 amps as it rotates and moves the piston. Thus the current changes from 1 to 28 amps and back several times per second while spinning at 1.5 RPM. The voltage at the power supply was very comfortably stable, fluctuating only a few millivolts during repeated 27 amp swings. Load Regulation Measurements: Load ==> Voltage at Screw Terminals (Fluke 87 III) ------------- ZERO Amps ==> 13.81V 1-28A ==> 13.76VA Additionally all Die Voltages were shifted up about 10mV as the power supply warmed up. Management. I have included a small guide. And as for the switch and cable connector, this power supply (like most other devices of this type) isn't designed to be left behind the TV and collect dust with exposed connectors etc. You are responsible for sealing it / protecting it from exposure hazards. . However, do not block the airflow. Both the manual and the yellow label on the device contain derating information for this power supply. For example, they recommend about 20% of the current rating above your needs. Therefore, do not use it for continuous loads over 40A. See photos for details and conditions that come with it. Finally, the fan is quite noisy. Always running at full speed. Good for my application as I want to know when it's enabled, but otherwise it would probably bother me and I'd love to host it remotely or enclose it somehow. I only use this on a bench with 4 rubber feet attached to the bottom under controlled conditions. I would buy it again as it is now a known quantity.