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Reply to "Circuit for constant to momentary relay for insulated rail operation"

John

V = L x di/dt where L and di are constants. The smaller V is, the longer dt is, that is the time for the current in the coil to dissipate. With a diode, V is 0.7 volts. Without a diode, V is whatever the break-over voltage of the contact is.

"When used with a DC coil relay, a flyback diode can cause delayed drop-out of the contacts when power is removed, due to the continued circulation of current in the relay coil and diode."

Above quote from below link.

https://en.wikipedia.org/wiki/Flyback_diode

 

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