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Solar Street light circuit explanation.

B

Besto

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Hi,
The schematic attached to this thread is a circuit design of a solar street light. I understood some part of it. But I am confused with other parts.Can anyone Help?
1730814907181.png

In the Circuit I understood how the LED is turned on and the voltage sensing at solar pannel.
I need to know about the section with Q11, Q13, Q14, Q15, Q16.

1730815357638.jpeg
1730815377851.jpeg

I was retracing the circuit from this board.
 

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