Got this to replace a honking big, transformer-based bench power supply. I really didn't need to substitute it, but I love having the workbench space back. And this device does a better job, in terms of power deliverable, and accuracy (but check the caveats).
Note: If it _is_ replacing your bench supply, you still need to supply DC power. A beefy 12V DC supply does the trick nicely for most cases.
What I liked:
* trimpots for voltage and current. Some devices uses button pushing, which is more "digital" but most often I'd prefer a knob to turn. I serious doubt the device has enough accuracy to warrant precise control via buttons.
* the trimpot knobs are tall, protruding through the facia, and thus finger adjustable. Never seen this kind of trimpot before, and I think they're awesome.
* Has a standard coax DC input, in addition to the screw terminals. 5.5mm/2.1mm, for the curious, which matched my 12V supplies perfectly.
* Current limiting works perfectly, and an "over current protection" kicks in if the current exceeds 6A. The device needs to be turned off-then-on (via the button or input power) to clear that condition. The display shows "OCP" during this state, which Robocop fans I'm sure would appreciate.
What I disliked:
* While there's a "on/off" switch, it does not electrically disconnect the output. It only (effectively) changes the set point to 0. This has the following problems, which may or may not be impactful.
* * When turned off, the on-board cap is still supplying energy until it's drained.
* * When turned on, the output voltage spikes about 2.5V higher than the set-point, and settles down after about 200ms. This, i believe, is due to the way the voltage is regulated, using a PID controller to adjust the duty cycle of the switching. (See, Ethyl, PID controllers aren't the panacea to all our problems!). This test was under a 100ohm resistive load (5V, thus 50mA), but without an additional capacitor. Higher loads, or a bigger cap, could reduce this. I STRONGLY suggest adding a mechanical switch rather than using the button to turn the input voltage on and off.
* Holding down the on-off button will have the display show "Out OFF" and "Out ON" alternatingly, but doesn't actually do anything. A single short press does the on/off thing. Perhaps some controller mis-programming has been made there.
* It's too easy to accidentally hit the "on/off" when all you meant to do was hit the "change display" button. If that irritates you, you can choose to not install the little green cap and/or file down that switch a bit, so the button is recessed.
Overall, a great little unit, and just needs an in-line switch or something to deal with that caveat. I've ordered two more!
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PEMENOL DC Buck Converter 5.5-30V to 0.5-30V 60W 5A Constant Current Constant Voltage Adjustable...PEMENOL
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Product description
Adjustable buck-boost power module
With large heat sink
LCD screen HD display
Support solar charging
With LC filter
High voltage resistant terminal
High-power adjustable buck-boost power supply module Constant voltage and constant current voltage converter
Features
1>.High voltage resistant terminal
2>.With high quality acrylic shell
3>.Support enabled/disabled output
4>.Support anti-reverse protection
5>.Support anti-backflow Protection
6>.Support short circuit protection
7>.Support over-current and over-power protection
8>.Powerful cooling fan
9>.Support over-temperature protection
10>.Support Automatic buck/boost voltage
11>.LCD screen HD display
12>.Support charging function
13>.Support display input voltage
14>.Support display output voltage, current, power
15>.Multiple parameters are displayed simultaneously
Smart cooling fan
When the current is greater than 3A or the power is greater than 20W or the temperature is greater than 40 °C, the cooling fan will start working.
Can effectively reduce the temperature of the project under load.
Long handle adjustment and button control
CV Potentiometer: Adjust output voltage.Increase the output voltage when rotating clockwise
CC Potentiometer: Adjust output current.Increase the output current when rotating clockwise
The button controls the output ON/OFF status, and you can set the power-on default to ON or OFF
LCD displays multiple parameters
LCD display input and output voltage, temperature, output current and output power.
Display OCP- overcurrent protection
Display OTP- over temperature protection
Display OPP- over power protection
Note
1>. Input Undervoltage protection voltage is 4.7V. The module needs re-power if input less than 4.7V.
2>. Please rotate the CV potentiometer counterclockwise more than 20 turns if there is no output voltage.
3>. It is a DC power module, So it can not connect to AC power.
4>. The module needs re-power after short circuit protection.
5>. Please connect input before connecting battery when using as charge and make sure output voltage is higher than the battery voltage.
6>. 'IN-' and ‘OUT-’ can not be connected together, otherwise the module can not support constant current output.
7>. Please make sure input power is more than load power.
8>. Please step down output power if the module is hot.
9>. Please read the user manual and description before use.
good value, works as advertised
I used this to upgrade a power supply that I had built many years ago, which didn't regulate very well. This is a "kit" in the sense that you need to bolt the fan to the back cover, plug in the fan, and bolt the front and back covers to the circuit board. No assembly instructions are provided, but the photos in the (downloadable online) docs are sufficient to see how to put it together. You only need a (#2) Philips screwdriver for assembly, plus a smaller (#0?) Phillips to lock the input and output wires into the terminal blocks. I made some simple tests using a "decent" DVM as my reference. The voltage display on the unit seems to read about 1 to 2 percent low; 25v indicated resulted in 25.04 measured using my DVM. Output voltage range is from under 1v to 32.67v (displayed, 32.71 measured). The current limit is easy to set: just short the output and adjust the current limit pot to the value you need. Accuracy of the current limit display is again in the 1 to 2% range, so acceptable for such an inexpensive unit. On nice feature is that the unit will regulate both up (boost) and down (buck) from the input voltage, so you can attach this to a (for example) 12V supply and get 24 volts out of it. The only "bug" in the unit is that the output voltage will shoot up above the set point when power is first applied to the unit. So only attach your load to the unit after it is powered up and the output voltage has arrived at the set point. (This is well within a second of power being applied). The photo is of the contents of the package: unit, fan and mounting hardware, case with hardware, QR code to get the docs. Apologies for the poor photo.
Top reviews from the United States
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- Reviewed in the United States on April 21, 2020
- Reviewed in the United States on March 18, 2021
I used this to upgrade a power supply that I had built many years ago, which didn't regulate very well. This is a "kit" in the sense that you need to bolt the fan to the back cover, plug in the fan, and bolt the front and back covers to the circuit board. No assembly instructions are provided, but the photos in the (downloadable online) docs are sufficient to see how to put it together. You only need a (#2) Philips screwdriver for assembly, plus a smaller (#0?) Phillips to lock the input and output wires into the terminal blocks.
good value, works as advertised
Reviewed in the United States on March 18, 2021
I made some simple tests using a "decent" DVM as my reference. The voltage display on the unit seems to read about 1 to 2 percent low; 25v indicated resulted in 25.04 measured using my DVM. Output voltage range is from under 1v to 32.67v (displayed, 32.71 measured).
The current limit is easy to set: just short the output and adjust the current limit pot to the value you need. Accuracy of the current limit display is again in the 1 to 2% range, so acceptable for such an inexpensive unit.
On nice feature is that the unit will regulate both up (boost) and down (buck) from the input voltage, so you can attach this to a (for example) 12V supply and get 24 volts out of it.
The only "bug" in the unit is that the output voltage will shoot up above the set point when power is first applied to the unit. So only attach your load to the unit after it is powered up and the output voltage has arrived at the set point. (This is well within a second of power being applied).
The photo is of the contents of the package: unit, fan and mounting hardware, case with hardware, QR code to get the docs. Apologies for the poor photo.
Images in this review
- Reviewed in the United States on August 21, 2019
This buck converter could have many uses. It is quality built and has many features. There are 2 ways to input power to the device. The input power is displayed on the LCD display. The display can be changed to display output power and current. You can easily switch between Watts and Amps on the display. I did find that the output power displayed was slightly off from the display on my multimeter. This is a small amount and should not be a problem. It is small and compact, it has a fan that automatically comes on when it starts to become warm from higher current demands. A complete set of instructions can be downloaded. They are thorough in content but the translation can add a bit of confusion. All in all this is a great little Buck converter and I can see many uses for it. It is well worth the money.
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- Reviewed in the United States on August 14, 2019
Kit was easy to assemble using description photos. Regulation is great and accurate. It is designed to be used un-enclosed and would be difficult to mount in an enclosure with access to the display, buttons and pots. It is however quite useful as it is. Quality is very nice and well designed. The only thing I would change would be that currently the regulator powers up in the ON mode whether it was ON or OFF when powered down. Not a huge deal but something to keep in mind when using it on the bench. In general I give this gadget a A+ for its design and usefulness to me.
Very nice regulator. Great for constant voltage or current on workbench.
Reviewed in the United States on August 14, 2019
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- Reviewed in the United States on August 13, 2019
This is a great power supply that will suit any need you have, whether you are running an electric motor, some speakers or anything that requires up to 30v or as little as .5v. I am planning on using it to run a diy wood lathe, and with the built in potentiometer I can vary the voltage to change the speed of it. I assembled the kit in 15 minutes and took just a few minutes to learn how to use it. With a large heat sink and a sturdy fan it should be able to handle lots of current fairly easily. This is a great product, especially for the price and I do recommend it.
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