I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the landscape lights on when solar panel voltage is between 0 V to 0.5 VDC and off above 0.5 VDC.

Attached image. I am not sure what is the purpose of 100 kΩ resistor? Can anyone take a look and advise.

Also, I am not sure how the values of 100k, 470 ohms, 1k ohms values are derived. Can someone help me understand this circuit in depth along with my 100 kΩ resistor question what is its purpose?

Below image came from this site user name Michal Podmanicky post #33. Used here only to explain how the circuit wors as the forum did not address fully how the circuit works exactly when this post was posted:

https://forum.allaboutcircuits.com/threads/bjt-as-switch-doesnt-work-why.200942/page-2

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the landscape lights on when solar panel voltage is between 0 V to 0.5 VDC and off above 0.5 VDC.

Attached image. I am not sure what is the purpose of 100 kΩ resistor? Can anyone take a look and advise.

Also, I am not sure how the values of 100k, 470 ohms, 1k ohms values are derived. Can someone help me understand this circuit in depth along with my 100 kΩ resistor question what is its purpose?

Below image came from this site user name Michal Podmanicky post #33. Used here only to explain how the circuit works as the forum did not address fully how the circuit works exactly when this post was posted:

https://forum.allaboutcircuits.com/threads/bjt-as-switch-doesnt-work-why.200942/page-2

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the landscape lights on when solar panel voltage is between 0 V to 0.5 VDC and off above 0.5 VDC.

Attached image. I am not sure what is the purpose of 100 kΩ resistor? Can anyone take a look and advise.

Also, I am not sure how the values of 100k, 470 ohms, 1k ohms values are derived. Can someone help me understand this circuit in depth along with my 100 kΩ resistor question what is its purpose?

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the landscape lights on when solar panel voltage is between 0 V to 0.5 VDC and off above 0.5 VDC.

Attached image. I am not sure what is the purpose of 100 kΩ resistor? Can anyone take a look and advise.

Also, I am not sure how the values of 100k, 470 ohms, 1k ohms values are derived. Can someone help me understand this circuit in depth along with my 100 kΩ resistor question what is its purpose?

Below image came from this site user name Michal Podmanicky post #33. Used here only to explain how the circuit wors as the forum did not address fully how the circuit works exactly when this post was posted:

https://forum.allaboutcircuits.com/threads/bjt-as-switch-doesnt-work-why.200942/page-2

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the landscape lights on when solar panel voltage is between 0 V to 0.5 VDC and off above 0.5 VDC.

Attached image. I am not sure what is the purpose of 100 kΩ resistor? Can anyone take a look and advise.

Also, I am not sure how the values of 100k, 470 ohms, 1k ohms values are derived. Can someone help me understand this circuit in depth along with my 100 kΩ resistor question what is its purpose?

Thank you all.

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the landscape lights on when solar panel voltage is between 0 V to 0.5 VDC and off above 0.5 VDC.

Attached image. I am not sure what is the purpose of 100 kΩ resistor? Can anyone take a look and advise.

Also, I am not sure how the values of 100k, 470 ohms, 1k ohms values are derived. Can someone help me understand this circuit in depth along with my 100 kΩ resistor question what is its purpose?