The power supply is designed to supply the RM2150 and RM2151 . The N2165 can be supplied from220V AC as well as 24V DC supply. The power supply module 9 is supplied with 2BV AC from the main transformer, or with 24V DC from the battery. The input from the main transformer is rectified and then combined with the 24V DC. From the rectifier, the voltage is fed to the input filter, which filters the noise from the switch mode power supply. After the input filter the on/off relay is located, after which the switch control and push-pull switch transistors are located. The switch control has two external regulation loops, one for current and one for voltage regulation. The power supply has three output voltages 19V and 9.5V.