WWZMDiB MT3608 2A DC-DC Converter 2-24V to 5-28V Adjustable Boost Module (3 Pcs)

Perfect converter 5V to 20V

The first one burnt up the instant power was applied to it. The second one did nothing but pass the same voltage no matter how many times you turned to pot and the third one tried to work until it hit current limit on my power supply.

This is a boost converter that arrives with the voltage set to minimum (2.85v). Connecting it to 5v will make it try to store extra power, which causes it to melt.Start with 2 AA batteries, then adjust the output to your desired input voltage. This will stop it from smoking when you connect it to higher voltages.

This is supposed to be an adjustable boost converter. I tried all three units and none worked out of the box. I applied 12V to the input and got about 11.5V out. Then I dialed the input to several other voltages and always got about a diode drop less than the input which means its not boosting at all. Worthless.

These boards are expertly constructed, and small enough to easily integrate in prototypes. It regulates voltage really well when the load is low, meaning that if you dial it to 12V, you will get 12V when the input is anything between 2V and 12V without having to re-adjust. In other words, it is a voltage regulator design, not a simple multiplier.I'm a little disappointed at the voltage regulation under load though. I was hoping that I would be able to use 3xAA batteries and produce a reliable 12V output. However, under just 70ma of load, an input of 4V maintains 12V out, but as the input drops to 3V the output drops to 6V. At that 3V, it is drawing 220ma which is 1/10 the rated amperage listed on the description and above the 2V minimum, so it seems like it isn't quite living up to its specs. I was really hoping that I could use this to take 3x batteries and boost them to whatever voltage I need and keep it there until the batteries were mostly consumed, but in order to get the target 12V I'll need to use 4 or more batteries to keep the minimum up to about 4V or higher as they run dry. Keep in mind this is only with a load - if you only need the voltage for a Mosfet gate or tiny op-amps, 3 batteries works fine.In short, it works, and works well for inputs about 4V and higher, or with negligible load, but doesn't work so well with inputs of 3v or 2v for tens of milliamp loads. If you want to power it with batteries and use most of the battery capacity, and need a particular output voltage, you'll need 4 or more batteries.

If you turn the potentiometer clockwise it will burn up, which is a very bad design. The Feedback pin of the MT3608 IC, which is what burns up is limited to 6 V. The board should have a Zener diode or something to limit the feedback voltage to 6 V.

Instructions say to turn the trimmer clockwise to increase voltage. 50 turns later and output voltage still equaled input voltage. Was about to return but decided to try turning it counter clockwise first. 50 turns later and it’s now boosting voltage like it should.

In the product description it says they are adjustable. These are not, I needed these to boost voltage. None of these are adjustable therefore they are not a good product, if they are not adjustable then I wonder what quality is left in the product. The second star is for the part of the product that’s actually working.