> > Perhaps I need to devise a better test.> Any ideas?
>=20
> The suggestion was there might be a minor effect when the relay eventuall=
y
> "drops out", at about 1.5 mins. Perhaps you could look at drain voltage o=
n the
> fet and set scope for one-time trigger on relay contact opening. Record s=
ome
> milliseconds either side of the event and look for (possibly very small)
> perturbation or change in slope. As the BS170 will still be partially on =
at that
> stage it's resistance should help damp/dissipate any spike, if there is o=
ne...
> will be interesting to see.

I had been thinking the same about using the relay contacts to trigger a sc=
ope. Would certainly be interesting to see what happens to the coil voltage=
 around that point.



--=20
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