The following circuit was designed by me in response to the request sent by PP. The article describes an LED emergency light circuit with advanced features such as, over charge battery cut off, day time auto-disable, and need less to say that the circuit switches ON the LEDs automatically when AC mains fails and reverts to charging mode when power is restored.
The good thing about this circuit is that it incorporates ordinary, cheap components which can be easily procured from the local market.
Let's try to understand the circuit functioning with the help of the following points:
IC1 which is our very own IC555 has been set as a comparator. During day time, the light over LDR keeps the LDR resistance low such that the potential at pin #2 of the IC is kept well over 1/3Vcc. This situation ensures that the output of the IC at pin #3 stays at logic high.
The logic high at pin#3 of the IC keeps T1 switched ON, which consequently keeps T2 switched OFF.
The following circuit was designed by me in response to the request sent by PP. The article describes an LED emergency light circuit with advanced features such as, over charge battery cut off, day time auto-disable, and need less to say that the circuit switches ON the LEDs automatically when AC mains fails and reverts to charging mode when power is restored.
The good thing about this circuit is that it incorporates ordinary, cheap components which can be easily procured from the local market.
Let's try to understand the circuit functioning with the help of the following points:
IC1 which is our very own IC555 has been set as a comparator. During day time, the light over LDR keeps the LDR resistance low such that the potential at pin #2 of the IC is kept well over 1/3Vcc. This situation ensures that the output of the IC at pin #3 stays at logic high.
The logic high at pin#3 of the IC keeps T1 switched ON, which consequently keeps T2 switched OFF.
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