Oldmics
04-20-2004, 08:37 PM
Hi Gang
Another forum member and friend of mine was in my shop today and he came up with an interesting question that perplexeds me.
When a speaker fails from D.C. voltages being present,the coil is burnt in a definate tell tale fashion.This pock marking on the coil usually either fuses the adjacent windings together(essentially lowering the ohmage) or burns the coil winding open.
Is this failure due to the current load placed on the winding material ,causing the failure of the winding material itself.Or is it due to the lamination material on the windings being burnt away from the coil,therefore exposing the bare uninsulated winding to shorting?
I realise each case will be different,but am seeking opinions from the forum.
Gentlemen?
Oldmics
Another forum member and friend of mine was in my shop today and he came up with an interesting question that perplexeds me.
When a speaker fails from D.C. voltages being present,the coil is burnt in a definate tell tale fashion.This pock marking on the coil usually either fuses the adjacent windings together(essentially lowering the ohmage) or burns the coil winding open.
Is this failure due to the current load placed on the winding material ,causing the failure of the winding material itself.Or is it due to the lamination material on the windings being burnt away from the coil,therefore exposing the bare uninsulated winding to shorting?
I realise each case will be different,but am seeking opinions from the forum.
Gentlemen?
Oldmics