Power Supply - 12V/20A

A constant and 12 volt source with internal voltage regulator suitable to operate any 12 volt device from 50 to 20000 mA (20 amps) or several 12 volt devices within the limits of the maximum output current in its entirety
Voltage adjustable within 10% of the increase or decrease with a variable resistance on the plate next to the terminals of the connection
It is used as a fixed voltage source for alarms, surveillance cameras and engineering projects for students
 
Several sources can be obtained ...