Hi!
I just want to show a cheap switcing lab power supply: "MCH-K305D". I bought it for hobby purposes, so I didn't want to spend too much. It was 70$ with shipping.
I haven't tested it totally. I will check it later with oscilloscope. I checked it with some leds an resistors. I also havent tested it at high load. Max load was 20-30W which I tested. It was interesting that the fan haven't started. I checked the three heat sinks on transistors which was quite cool so I hope this is why the fan haven't started. I think it is not too bad for that price. At low currents the current limiting is not perfect. If I start to decrease the current limit, it sometimes goes down to 0. If I start to increase it, it jumps up to 50-100mA. Voltage adjustment is quite good, its precision is around 0,05V.
I think for hobby purposes it is not a bad power supply.
I wrote this little "review" because I haven't found any info before I bought it. (sorry for my bad english
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
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I would like to see others opinions about this item.
advantages: (based on my limited electronic knowledge)
+ cheap
+ good voltage precision
+ silent (at less than 30W - or bad fan ?)
+ switching supply - so I think is is efficent
disadvantages
- not too good current limiting
- not a known reliable brand