Emergency light.

The circuit of emergency light has the following features: When the mains supply (110 AC or 230V AC) is available, the light turn off. When the mains supply disappear, the light turn on.

Emergency-light

Circuit simulated with libewire:

Emergency light simulated

Important:

-Q1 y Q2 are PNP.
-R1 comprises of the circuit of charge of the battery and it will be due to choose according to the current to which we want that loading this one.
- T1 must give in C1 a tension to us that is at least a 20% major to the tension of the battery; for example if this outside 12 volts would be advisable that in C1 were about 15 volts.

Emergency light.

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