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samtree 02/05/2020
VISUAL INSPECTION : Quality of construction very good, no loose components, no bad solder joints. PERFORMANCE : It worked just out of the box. I left it without load for about 15 minutes and then I coupled three 12 Volts 50 Watts bulbs connected in series. Output 4.2 Amps (150 W). No smoke, no smell, no noise at all, output voltage extremely stable at 35.77 Volts (with no load) and 35.7 Volts (with 4.2 Amps load). So far so very good. Then I tested it more thoroughly with the same setup at 4.2 Amps (no smaller loads). My findings A. Voltage : Extremely stable. B. Cooling : Poor. As other reviewers have said, it can get really hot. After 10 minute at 4.2 amps, the temperature of the output heatsink reached 52 degrees Celsius and was going up (photo 1). Transformer and input heatsink were also too hot, output capacitors also felt hot. I installed above it a 8x8 cm, 24 Volts, 60 mA fan, and now it is really cold – after hours still 31 degrees Celsius. Perfect C. Output ripple (with 20 MHz filter set to ON): Not acceptable. At 4.2 Amps, it is about 850 mVp-p (photo 2), consisting mainly of a sinewave (630 mVp-p, photo 3) and on top of it are added the spikes ( 210 to 250 mVp-p - photo 4) due to the switching frequency. Reason: inadequate output capacitance. By simply adding a 4700 uF capacitor on the output (you can connect it directly to the spare positions on the output connector), the ripple goes down to about 350 mVp-p (photo 5). The quasi-sine wave is now much smaller (ca 50 mVp-p – photo 6), while the spikes remain the same. If you want, you can add on the output an additional LC filter like I did (13,5 mH inductor from the junkbox + 1000 uF capacitor), and go down to less than 160 mVp-p overall ripple (photo 7) because spikes are now 130 mVp-p or less (photo 8). Not bad. Conclusion : Add a fan and a 4700 uF output capacitor, and you have a decent general purpose 36 Volts Power Supply, with enough output current and for a very low price.
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