DROK 5V Voltage Regulator, NC Buck Converter DC 5-32V to 0-30V 5A Adjustable Step Down Power Converter Board Power Supply Reducer Transformer Module

Amazon says I've had mine since April, 2017.I glued feet onto mine and put a heatsink on the chip, and power it from an old HP inkjet power supply. If you want to do the same, the one I use had a purple plug - they come in different sizes but all seem to be 30-32v output. Used ones should be easy to find for almost nothing.Works fairly well, though I have noticed the +/- buttons act sticky (press detected, release isn't) at times. Seems to coincide with the output being off but voltage still present (i.e. connected to something with a large capacitor on the input, or connected to a rechargeable battery to charge it).Another thing I'm not thrilled with is the display. It can be too bright in a dimly-lit area, but for whatever reason (contrast between segments and surround?) it's also difficult to read when well lit. Haven't actually compared to other 7-segment displays but pretty sure most outperform.Both of these issues are annoying but not a showstopper - I'd definitely buy again.

compact, beautiful for use as a power source

work good

The description can be a little misleading since this board is not FOR numerical control but is controlled digitally (numerically) by using the buttons on the board. With the buttons, you set the constant output voltage and the maximum current. There may also be a way of using it for a constant current supply, haven't tried. It works perfectly and a great deal. The meters show the output voltage and current or the input voltage and current. There are four buttons that are used for the settings and three leds to show whether the output is on or off and whether the meters are showing the input voltage and current or the output voltage and current. The only downside of this board is that you might need a "cheat sheet" to remind you of the button sequences and what the leds mean (see pic of my cheat sheet, I hope is correct. If you cannot read or is incorrect, let me know. You might have a better one). Using buttons was clearly a way to save money. DROK has other models that are easier to set and enclosed but much more expensive, so you have a choice (I have both). The other thing is that since everyone is on one board, it is a little difficult to put in a case. I removed the two input and output terminal blocks and added separate binding posts and I jumpered other separate buttons which I mounted on the box front panel. I then cut a rectangular hole in box so the display is visible and mounted the board on some standoffs. I then pasted the cheat sheet on the top of the box. For a power supply to feed the board, I used a left over laptop power supply (or you can buy one $10). I also added a couple of inexpensive digital readouts so I could see the input and output at the same time (why not for $4 for both?) I put two of these in one box using just one laptop supply for an inexpensive dual bench power supply for a fraction of the price. Plus it was fun (for me!) All this was no problem for me since I have been doing this stuff for fifty years (yup) but others might be better off paying more to get the unit with a knob and is enclosed. Thank you DROK.

It is working well.. excellent choice

Once again DROK delivers a well made product that lives up to the description. If you hobby around with small electronics and / or IOT applications this is a must have item. Controlling the voltage accurately is the difference between success and failure. For the price and the quality of the build this is a must have item. The range of application you can use this for is unlimited. If you want to pretty it up then making a case is simple especially with a 3D printer. I tested this numerous of times against more than one volt/ohm meter and it always matches.

The board appeared slightly corroded upon receipt, but I didn't think much of it until the buttons completely stopped working. Prior to this, the device was working completely fine. This product either doesn't deal well with humidity or was improperly stored in the warehouse prior to receiving the product. I will not be buying this again.

The voltage regulator works well, it is quite accurate and stable as long as you don't limit the current. Once you set it on current limiter, the device (the one that I got) started oscillating around the set point of the current limit. So, if you want to control a device based on current, my device vas unstable. If you want to power up a device that requires a certain voltage that you don't have it, you can use this regulator and as a step down from a higher voltage DC suplly and use the current display as an indicator. I bought it to use as an adjustable power supply, a step down from a 32V SMPS, but it was to slow on reading and limiting the initial current. It would be a great tool around your lab if it would be more stable.

broke upon arrival. Caps fell right off.

This works great as a universal lithium battery charger (as long as you keep in mind that the input voltage has to be higher than the output) allowing you to charge to the exact voltage level of your choosing. The only difference between this and a "real" battery charger (other than full operator control) is that it doesn't cut off and tell you that the battery is fully charged - you have to be nerdy enough to tell that by looking at the twin displays. I'm using it to individually top off low cells in multi-cell battery packs via the balance leads - and so far it is the perfect tool for that.As the battery is coming up to charge the regulator charges at a Constant Current level of your choosing and then transitions to a Constant Voltage (aka CCCV) level as the battery is topped off at the target voltage - when the battery is fully charged the current will be near zero. So even though it doesn't turn off your battery will not be over charged - unless you tell it to. Which you could.Notice that the instructions tell you that if you exceed 2 amps you should augment the cooling - they aren't kidding. I forgot that and set it to deliver 5 amps (which it did do) and within a few minutes it stopped charging - permanently. It won't stop you from setting it for up to 5 amps. I advise that if you are forgetful like I am that you protect it with a 2 amp fuse.

went through 2 in a short time and ive only had these issues with this perticular one, though it was bad luck tried again, just cheap parts, if you enjoy things burning up for no apperent reason buy this, only suggestion i could think of is put a very weak fuse 0.5a maybe and you might keep it alive long enough to charge a battery or two, i wont buy another one which is a shame because if was better quality id love it, over all a disappointment.

GR8T "little" board.. FOr THat PRice, a knock-it out of the park. Works better than expected. The display is beyond ViBrAnT and CoLoRfUlL. Only had it for a day but me Likes. --- Arrived sooner than delivery date (I think by about ~5 days sooner. Got to love that). Uber well packed. Can it be to well packed? Almost :) Note: inside the "last" protection bag you will find the board "and" four (4) tiny rubber button covers. Just be careful as you pull the board out. I wasn't, but I found them.. my mistake. WOULD PURCHASE AGAIN ;8o] I'm going to find out what other little gems they have. Cheers!