It seems that the OP is using a capacitor to lower slowly the Vgs to the
point that the relay opens.

I don't think it is safe from the relay contact's life perspective. With
the coil current slowly diminishing the attraction force will also
diminish to the point that the low contact pressure could cause the
contacts to heat and erode before opening totally, causing hot spots and
perhaps arcing.

A safer approach would be using some sort of Schmitt Trigger to drive
the transistor, so the turn-off will be fast after the trip point is met.

Just my $0.02

Cheers,

Isaac



Em 01/01/2017 10:52, alan.b.pearce@stfc.ac.uk escreveu:
> lp damp/dissipate any spike, if there is one...
> will be interesting to see.


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