Review on Versatile HANMATEK HM305 Switching Variable Control by Chris Horton

Pros: The display is awesome! There is a protective film on the screen, so you'll need to remove it to really see the screen at its best. Overall this is a very sleek, clean and modern device. The exit button is great. If you want, you can turn off the output while making adjustments. But if you want to make adjustments during withdrawal, you can still do so. These two functions are mentioned in the manual, but the writing is kept quite small: If you hold the voltage regulator down for a few seconds, it locks the initial state. Shutdown buttons every time you turn on the device, allowing you to disable or enable shutdown at startup by default. If you press and hold the power slider for a few seconds, you can lock the device to prevent accidental changes to values. The exit button can still be toggled on and off when the device is locked. The voltage shown appears to be fairly accurate. When testing the open circuit output voltage with the Fluke 177 DMM, the supply voltage was always within 5 mV. I haven't tested the accuracy of the current yet. The adjustment knob lets you change the value of each digit, but as you keep scrolling, the surrounding numbers will increase or decrease, so you don't have to keep switching between digits. For example, if your voltage is currently set to 3.3V and you want to increase it to 5.0V, you can either adjust the integer and tenths individually, or just stick with the tenths and this will shift an integer with . (Once you reach 3.9V and advance another click, it jumps to 4.0V, not 3.0V). The flexibility to change values anyway makes things really nice. It's not unique to that particular make/model, but like most other switching power supplies, it's very compact and lightweight. He is absolutely silent. It has a fan and I think it will kick in at higher load demands, but so far I haven't had it kick in. The power readings are amazing if, like me, you frequently want to see the power consumption of a particular circuit. .Cons: The power button needs to be pushed a little further than you might think to keep it locked. The first few times I turned it on I pressed it hard enough to light up the display, but as soon as I released the button I pressed it and it turned off. Not a big deal, just something to watch out for. The case is made of plastic. If he's just sitting on your bench, it probably doesn't matter. If you move it around a lot, it might not hold up as well as a metal case. The fit and finish seems pretty good, but it doesn't feel like a tank in any way. Once you press the voltage or current buttons to make adjustments, you only have two seconds before it returns to normal operation if you don't move. button so you can set yourself up quickly. It takes a split second to limit the current. I connected a simple LED and set the limit to 10mA. When I turned on the output, the LED lit up very brightly for a very short time. As far as I can tell this isn't a problem since it's such a short transition, but maybe more sensitive circuitry could be a problem? As long as you also limit your tension to a reasonable level, I don't see this as a problem.