PNP Bipolar Junction Transistor (BJT) lets you switch from the high side of the circuit.
Base resistor must provide enough signal current to saturate (fully turn on) the PNP transistor when the switch is closed. A 10kΩ resistor typically works well. The transistor must be able to handle the current demands of the load.
The 2N3906 maximum collector current rating is 200mA. As always, consult the component datasheet of the particular component you are using for the most accurate specifications.
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