Solar battery charged night light LED circuit

302

04:38:06

Left source is the Solar panel and right is the battery. Could someone please explain how the pnp transistor and resistor work in this? Trying to wrap my head around it...

Change the left source to simulate light hitting the panel! 0-2.5V.

published 6 years ago

BillyT

6 years ago

It looks like as though the solar panel has few functions, when the solar panel voltage is less than 2.25V the light is on when the Voltage is greater than 2.45V the light is off, when the voltage is greater than 3.3V the battery is being charged.

avid0g

6 years ago

The resistor is the only circuit element that can turn on the transistor. The lower diode can raise the base voltage enough to turn off the transistor.

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