Power supply based on LM317T.
Trimmer potentiometer is used to control the output voltage /10-14V/.
In case of use of a battery, the output voltage is set to 13.6V to allow for recharge of the battery.
In case that the input voltage is cut, the battery is on.
Power supply unit is suitable for alarm systems and other devices need continuous operation in case of power mains failure.
This device can operate also without a battery.
Input voltage: 22V
Output voltage: 10-14V
Output current: 3А