Re: Delay on-instant off with 555 timer
Ideally the inrush NTC/PTC thermistors run on their own without the need for the shunting relay.
Both will work if the expected operating temperature is where you expect the circuit to run.
NTC gets hot and stays hot during operation, keeping its resistance low.
PTC due to the inrush will get hot really fast, then the resistance goes up fast, limiting current. However then current goes down when the inrush is over, the PTC cools down, and resistance drops back low to a low dissipation number.
Weird that both actually work if they are designed properly.
Ideally the inrush NTC/PTC thermistors run on their own without the need for the shunting relay.
Both will work if the expected operating temperature is where you expect the circuit to run.
NTC gets hot and stays hot during operation, keeping its resistance low.
PTC due to the inrush will get hot really fast, then the resistance goes up fast, limiting current. However then current goes down when the inrush is over, the PTC cools down, and resistance drops back low to a low dissipation number.
Weird that both actually work if they are designed properly.
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