Amazon.com: Belker 30W Universal 3V 4.5V 5V 6V 7.5V 9V 12V AC DC Adapter Power Supply for LED Light Strip Router Speaker Smart Phone Tablet CCTV IP Camera TV Box 0.5A 1A
automotive - I'm trying to use 3v LEDs in a 12V circuit, in my car - Electrical Engineering Stack Exchange
Amazon.com: ZOZO Universal AC/DC Adapter 30W Switching Power Supply 3V to 12V W/USB Port & 8 Selectable 8 Adapter Plugs for Household Electronics LED Strips Tablets Webcams Speakers USB Hubs and More :
Use LED light with 12v DC (using resistor) - YouTube