The power supply unit based on LM317T.
Trimmer potentiometer for control the output voltage /10~14V/.
If battery use - the output voltage is 13.6V required for battery recharge.
In case of cut the input voltage, the battery is on.
Power supply unit suitable for alarm systems and other devices with continuous operation, even in case of power mains failure.
Can operate also without battery.
Input voltage: 22VDC/15~18VAC
Output voltage: 10-14V
Output current: 3А