![Would somebody be kind enough to ELI5 how to calculate the base resistor required on a 2N2222A (used as a switch) when using a 5V Arduino Uno to control a solenoid actuator. Would somebody be kind enough to ELI5 how to calculate the base resistor required on a 2N2222A (used as a switch) when using a 5V Arduino Uno to control a solenoid actuator.](https://preview.redd.it/would-somebody-be-kind-enough-to-eli5-how-to-calculate-the-v0-7sjr72yrziwb1.jpg?width=1080&crop=smart&auto=webp&s=3b89dc727a64df1816922f0fa32cb4c262b60fda)
Would somebody be kind enough to ELI5 how to calculate the base resistor required on a 2N2222A (used as a switch) when using a 5V Arduino Uno to control a solenoid actuator.
![SOLVED: NPN 2N2222 transistor Mid-Band Design Parameters: Vcc = 12 V, Ic = 2 mA, emitter voltage VE = 2 V, RL = 1 kΩ, Rs = 100 Ω VBE = 0.65 SOLVED: NPN 2N2222 transistor Mid-Band Design Parameters: Vcc = 12 V, Ic = 2 mA, emitter voltage VE = 2 V, RL = 1 kΩ, Rs = 100 Ω VBE = 0.65](https://cdn.numerade.com/ask_images/2bf2d8aeaa69464ba0d813816433fb8b.jpg)
SOLVED: NPN 2N2222 transistor Mid-Band Design Parameters: Vcc = 12 V, Ic = 2 mA, emitter voltage VE = 2 V, RL = 1 kΩ, Rs = 100 Ω VBE = 0.65
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![Test circuit for 2 N 2222 BJT transistor 4 RELIABILITY PREDICTIO N S By... | Download Scientific Diagram Test circuit for 2 N 2222 BJT transistor 4 RELIABILITY PREDICTIO N S By... | Download Scientific Diagram](https://www.researchgate.net/publication/261522918/figure/fig3/AS:296842509209602@1447784177300/Test-circuit-for-2-N-2222-BJT-transistor-4-RELIABILITY-PREDICTIO-N-S-By-applying-the.png)