DIY QC3.0 Voltage Trickle Device

If you're interested in making a DIY voltage trickle device, check out this article and follow along to build your own QC3.0 trickle device. This way, whenever you don't have an adjustable power supply, you can turn a regular charger into one at any time. The parts required are minimal. Here's the front view:

If you don't have enough surface-mount components, you can use through-hole resistors, but keep in mind that this might increase the size:

Backside wiring:

You can opt for a slightly larger button for a better tactile feel when adjusting:

The voltage is adjustable in 0.2V increments.

Through testing, the voltage can go as low as 3.7V:

The maximum voltage is 12V:

Within this range, you can adjust to your desired voltage. It's quite practical, and you can even solder on a USB female port for easy output:

All done!