Kevin,
The relay may be sticking because of residual magnetism. A piece of paper
between the relay poles, i.e the coil centre and the armature, will prove this
- if it's residual magnetism, the relay will drop out fine once you increase
the magnetic reluctance. If that's the case, a bit of Scotch or even PVC tape
should provide a cure. Reversing the leads to the relay will also help for a
time, although if there's a diode across the relay coil, that will need
reversing too.
Some relays provide a copper stud to keep a small air gap: others even have an
adjustment screw for the same purpose.
73
Peter portable SM/G3RZP (where it's snowing..)this week
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