The scenario
Designing a time-delayed relay for industrial machinery startup, where a delay is needed before energizing a load after power-on.
What is in this drawing
Read the decisions behind it.
01
Choosing RC time constant for desired delay
02
Selecting transistor to handle relay coil current
When you need a simple hardwired timer delay to switch a load after a set interval, without microcontrollers or programmable timers.
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