Review on 💡 5V Regulator - DROK 5pcs Mini Voltage Reducer DC 4.5-24V 12V 24V Step Down to 5V Buck Converter Board 3A Power Supply Module by James Vilchez

As mentioned by several reviewers, I couldn't get the fixed tension to work on the first try. So I decided not to give myself a headache and just use them as a variable current source. I was able to fine-tune the outputs as needed and the output seems to remain stable. I haven't used them long enough to vouch for their long-term accuracy, but for now they provide an inexpensive solution for some antique restoration projects. I just converted an NLS MS-15 scope and these down converters worked. Excellent. The MS-15 shown was originally powered by three 2-volt lead-acid gel batteries. The oscilloscope's power board included charging circuitry, a battery monitor, and a 5V regulator that fed the oscilloscope's main switching power supply. The gel cells are long dead and it looks like part of the charging circuit self-destructed. The previous owner removed the gel cells, bypassed the battery circuit with a wall transformer, and installed a 7805 regulator on the motherboard. Line feed only. The main benefit of such a small scope is portability, and battery life is a key component of portability. So I decided to restore vision from the battery. After removing all charger and regulator components, I installed a 2600mah 13.8V Li-Ion battery pack on the motherboard and a Drok-Buck regulator on the power supply board. The original DC connector was a switchable one, which allowed me to disconnect the battery while charging. The MS-15 power switch connects to ground at power-up, ideal for the DROK controller power-on pin. All I had to do was make sure the DROK regulator was set to 5V, solder the output wire to the power board, and the scope worked exactly as expected when I turned it on. I soldered the DC connector to a Tenma Li-Ion 13.8V charger and charging works great too. With the scope off, the DROK draws about 120uA from the battery, which is next to nothing. The scope can work for a year without a charger connected and will not drain the battery too much. During operation, the oscilloscope's switching power supply draws approximately 400mA from DROK, resulting in a battery life of approximately 6.5 hours. That's more than twice the operating time of gel cells. The DROK converter works silently and has practically no residual ripple. The visor does not pick up noise from the DROK regulator. I installed it as far away from the deflection amplifiers as possible, just in case. I set the output voltage to 5.35V and it stays stable at that output voltage for a week. The original gel cells are only rated for about 3 hours so the lithium ion battery is perfect for me and saves a lot of weight. I haven't connected a battery monitor to blink or turn off the power LED when the Li-Ion battery needs charging, but I may add one in the future. I am very happy with the performance of the DROK buck converter. in my application. They are very small and in my opinion very easy to use in a project. I will definitely buy more of these. If you're looking to overhaul battery powered devices and modern lithium-ion cells are fine, the DROK regulator is a great way to get the exact voltage you need for your device. If only I could understand how fixed output settings work. should work :)