No don't use it! The PSU will supply 19V ("voltage source") and will probably damage the load. There are PSUs that limit output current by dropping/regulating the output voltage (which then can be considered a "current source"), but as long as the required current isn't constant that wouldn't work either. AsI said, lights and fans, I use them "in pairs". Meaning in series. Take 12V LED bulbs. Two of them, you have four wires (two each). Connect two together, and the other two to 24V + and -. Doesn't matter which*. Each will use 12V. Lights look good in pairs :·) Fans, polarity (+ or -) matters - for flow direction. Ive followed this primitive wiring diagram, but no matter which DC boost converter I plug in, none of them do anything. I've been through four MT3608's now, and I can't get a single one to go past the battery voltage of 3,6v. I must be doing something wrong, but what could it be? 030V DC Dual Variable supply Using LM317&LM337, Max adjusts the voltage of 0-60V. It's high volt and starts voltage at zero! good job. Best Adjustable DC power supply 3A; —1.2V-20V, 3V-6V-9V-12V High current for all circuit easy to use. Dual power supply 3V,5V,6V,9V,12,15V —using LM317, LM337. Routersupport: 9V/12V-1A/1.5A/2A. POE Support: 15V/24V. USB Output: 1.7A Max. Massive 8800mah battery provides upto 8 hours of backup. Battery Level indicator helps check charge/backup Level. Compatible with All 12V and 9V Routers with 1A / 1.5A / 2A Input Requirement. (Please check your Devices Power Requirement on its original Charger Vay Tiền Trả Góp Theo Tháng Chỉ Cần Cmnd Hỗ Trợ Nợ Xấu.

can i use 12v 1a for 12v 2a