Pull up resistor assists 555 in keeping PNP BJT off

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[@akeem11h]

@davellewellyn9306 Great question. The 555 timer setup allows for multiple triggering options, such as immediate on/off or delayed off using an RC configuration. It can also be used for light-dependent actions, multiple switches, or a variable resistor to control the 555 output as high or low. Additionally, the 555 timer provides stable voltage to protect the transistor and ensures efficient operation, reducing power loss.

[@davellewellyn9306]

Forgive me , im no expert but why use a 555 timer , can you not switch the transistor directly🤔