I have a watchmaker customer who complained to me the other day about the problems caused to him in his work by his miniture screwdrivers becoming magnetised and asked me if it is possible to demagnetise them effectively.
A minutes thought and a dip into the junkbox produced an old washing machine water valve solenoid coil.
These coils are rated for 240V operation so I connected a power lead to it and tried it out.
Inserting a magnetised screwdriver into the center hole and then slowly drawing it back out and moving it a long distance away before switching off the coil current gave a totally demagnetised screwdriver that would not pick up even the tiniest sliver of iron.
There have been comments here on the forum of deleterious sonics caused by magnetic components and component leads.
This arrangement may be very effective in demagnetising components before fitting to a pcb.
Maybe this informatiuon is useful to some of you.
Eric.
A minutes thought and a dip into the junkbox produced an old washing machine water valve solenoid coil.
These coils are rated for 240V operation so I connected a power lead to it and tried it out.
Inserting a magnetised screwdriver into the center hole and then slowly drawing it back out and moving it a long distance away before switching off the coil current gave a totally demagnetised screwdriver that would not pick up even the tiniest sliver of iron.
There have been comments here on the forum of deleterious sonics caused by magnetic components and component leads.
This arrangement may be very effective in demagnetising components before fitting to a pcb.
Maybe this informatiuon is useful to some of you.
Eric.