I appreciated the size and low cost, but I felt the choice of the adjustable trim potentiometer on the circuit board was not suitable for the task. At first, I thought that all the boards were defective, because all they did was track the input voltage, not boost it. You had to turn the adjustment screw about twenty times counterclockwise before it affected the voltage. I assume that these are 25 turn Bourns 3296 (10 3) 100,000 Ohms trimpots (figure 1). Admittedly I am not an engineer, but when only the last 2 or 3 turns on a 25-turn pot are useful, then it's my opinion that the wrong pot (meaning the incorrect resistance) was chosen. I noticed that on one of the other voltage regulator boards that I purchased at the same time has a 10,000 Ohm trimpot (figure 2), and has a more useful range of the trimpot, although I realize it depends on the entire circuit. But I think you get my point. (I'm not sure I understand one of the comments about having to push the trimpot screw in to get it to work. I have not had this experience with trimpots.)
VINTAR EU To US Plug Adapter 3-Pack For Easy Travel: Europe To USA Converter For Spain, France, And More, Compatible With Type C/E/F Plugs - European To US Power Adapter Solution
11 Review
Kohree 36V To 12V DC/DC Converter Regulator - 10A 120W Golf Cart Voltage Reducer
17 Review
EXuby Digital Converter Box For TV With RF/Coaxial And RCA Cable For Recording And Viewing Full HD Digital Channels Free (Instant Or Scheduled Recording, 1080P HDTV, HDMI Output, 7 Day Program Guide)
12 Review
Germany France Travel Power Adapter,TESSAN Schuko Plug With 2 USB Ports 2 AC Outlets, US To European Europe German French Spain Iceland Norway Russia Korea Adaptor(Type E/F)
17 Review
Experience Superior Sound Quality With SMSL Audio SAP-8 Headphone Amplifier In Black/Silver/Gold
5 Review
Premium Harman Kardon AVR-154 Home Theater Receiver - Discontinued by Manufacturer
11 Review
Denon AVR-2113CI Networking Home Theater Receiver: AirPlay, Powered Zone 2 | Discontinued by Manufacturer
9 Review
Sony STR DH790 7 2 Ch Receiver Vision
11 Review