情境
Designing a time-delayed relay for industrial machinery startup, where a delay is needed before energizing a load after power-on.
這張圖裡有什麼
看懂背後的決策。
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.