Power Supply With Battery Backup Circuit Diagram. The output current is 1a due to which the circuit can be used for wide variety of devices which require current under 1a. Adapter is used as the power source a universal adapter with its output set to 12 v will do equally well.
The circuit shown in the diagram is made for 12v routers modems but you can easily convert it to use for other voltages and you simply have to change the last ic that is lm2940 12. It will keep a stable voltage when it has any load. The circuit starts with relay with 24v supply powering up the relay coil and our load is connected to no pin of the relay through a diode and capacitor.
The power supply connects to the circuit with a dc power connector.
On the grounds of safety and economy a simple unstabilized 12v d c. If it s an ups the inclusion of a battery charger circuit becomes imperative. The power supply connects to the circuit with a dc power connector. Adjustable power supply circuit.
