battet back up circuit


Posted on Feb 7, 2014

This Battery Back-up circuit can be added to surveillance systems or control like alarms to power the circuit during Mains power failure. the battery back-up will immediatly take up the load without any delay the circuit is simple to construct. Regulator IC 7809 volts regulated DC for powering the circuit as well as to charge the rechargeable batte


battet back up circuit
Click here to download the full size of the above Circuit.

ry. LED indicates the power on status, when the mains power is available, diode D1 forward biases and passes current into the battery through R2. Value of R2 is selected to give 90mA current (9/100=0. 09A)for slow charching. when the mains power failure D1 reverse baises and D2 forward biases and buck-up the circuit. the same circuit can be used in circuits having 6 volt 7. 5 Ah battery. for 12 volt battery, use 7814 regulator IC and 14 volt input




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

50W-audio-power-amplifier
LM3914 Low Power LED Voltmeter
Ambient Power Module
working with ic555
audio stereo channel selector circuit
12v to 120v voltage inverter circuit



Top