Hi to all

does anyone can send me the formula for latching relay?
I want to hold the a 12v relay for certain time after power-off (about 20
seconds) the relay consume 37mA/12v (I think it's coil resistance is 30-32
Ohm) what is the size of the capacitor I should use?

p.s: across the coil there is a 1n4001 diode does it important for
calculation?

Thanks

Tal

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