Reddit reviews Buck Converter 12v to 5v, DROK 5A USB Voltage Regulator DC 9V-36V Step Down to DC 5V-5.3V 5.2V 3.5-6A Volt Transformer Power Supply Module for Phone Fast Charging
We found 2 Reddit comments about Buck Converter 12v to 5v, DROK 5A USB Voltage Regulator DC 9V-36V Step Down to DC 5V-5.3V 5.2V 3.5-6A Volt Transformer Power Supply Module for Phone Fast Charging. Here are the top ones, ranked by their Reddit score.
DROK buck converter input voltage is DC 9v-36v, output voltage is 5.2V (5V-5.3V available according to your input voltage).The step down regulator adopts synchronous rectification scheme to provide wide voltage range, large current and high efficiency.Our buck voltage regulator is user-friendly, accompany with DC interface and connecting terminals, make it easier to be connected to different devices.The voltage reducer is with USB interface and quick charge identifying chip, and is compatible with Android and Apple.Note: Input different voltage will output different power: input DC 9-24V, output 5.2V/6A/30W; input DC 24-32V, output 5.2V/5A/25W; input DC 32-36V, output 5.2V/3.5A/18W.
Not a service but lots of DIY hobby electronics folks use small buck converters for this sort of thing. (Example link below, I am not affiliated or recommending that product.)
You can get them cheaper if buying in bulk from eg. Aliexpress
Honestly everything will be Chinese this sort of stuff is basically not made elsewhere, just rebranded.
https://www.amazon.com/Converter-DROK-Regulator-Inverter-Transformer/dp/B01NALDSJ0
I used this: https://www.amazon.com/dp/B01NALDSJ0/ref=cm_sw_r_cp_apa_i_2LjxDbP3ZP8DJ
I had a barrel connector to a pigtail. Wired that to power supply. USB out and it's worked like a charm.