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SamGibson
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Activate 12V12 V Relay with a 5V5 V GPIO

What is the reason of using 10K10 kΩ resistor in series to the control signal? isIs it related to the base current according to the NPN transistor's datasheet?

For example: my CONTROL/GPIO is 5V the maximum base current according to the NPN transistor's datasheet is 120mA Does

  • My CONTROL/GPIO is 5 V.
  • The maximum base current according to the NPN transistor's datasheet is 120 mA.

Does it meansmean I need to have minimum 42R42 Ω resistor?

Thanks, Roy

enter image description here

Activate 12V Relay with a 5V GPIO

What is the reason of using 10K resistor in series to the control? is it related to the base current according to the NPN transistor's datasheet?

For example: my CONTROL/GPIO is 5V the maximum base current according to the NPN transistor's datasheet is 120mA Does it means I need to have minimum 42R resistor?

Thanks, Roy

enter image description here

Activate 12 V Relay with a 5 V GPIO

What is the reason of using 10 kΩ resistor in series to the control signal? Is it related to the base current according to the NPN transistor's datasheet?

For example:

  • My CONTROL/GPIO is 5 V.
  • The maximum base current according to the NPN transistor's datasheet is 120 mA.

Does it mean I need to have minimum 42 Ω resistor?

enter image description here

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Activate 12V Relay with a 5V GPIO

What is the reason of using 10K resistor in series to the control? is it related to the base current according to the NPN transistor's datasheet?

For example: my CONTROL/GPIO is 5V the maximum base current according to the NPN transistor's datasheet is 120mA Does it means I need to have minimum 42R resistor?

Thanks, Roy

enter image description here